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Author Topic: AT fuel mix  (Read 2900 times)

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Offline TrevorP

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AT fuel mix
« on: September 29, 2018, 10:33:44 PM »
This topic has probably been discussed exhaustively so I'll apologise now and prepare for incoming.
I've been using 50:1 in my 034 for many years - never a problem but it's not running day in/out.
I needed something for a bigger job and bought a new husky 565 - an AT saw.
The manufacturer recommends 50:1 but the dealer said he runs 25:1 - and not just for the first few tanks.
I know that manufacturers are constrained by EPA legislation and need to specify low oil content but does the dealer have a point, saying that 50:1 will cause hotter running?
Will it benefit from a heavier mix?
Will 25:1 lead to gumming up or carbon deposits in a saw that only gets occasional use?

Offline HolmenTree

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Re: AT fuel mix
« Reply #1 on: September 29, 2018, 11:02:48 PM »
WelcomeTrevor!
Hey I want to hear how you like the new 70cc 565. Still no sign of them here yet.
Run 50:1
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Offline Southside logger

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Re: AT fuel mix
« Reply #2 on: September 29, 2018, 11:48:56 PM »
I don't have any AT saws by design and for what it's worth I run 32:1 in all of them. 372xt's, 395's. I even go so far as to use the Wally world marine 2 cycle oil that comes in gallon jugs. Never caused an issue for me. 
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Re: AT fuel mix
« Reply #3 on: September 30, 2018, 12:53:30 AM »
I like 32:1, I'm running that ratio in all of my saws including my Stihl 261cm. It runs just fine on it.
Too many irons in the fire

Offline TrevorP

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Re: AT fuel mix
« Reply #4 on: September 30, 2018, 05:07:59 AM »
Only had it 2 days so itís a little early for a review but so far itís all positive - not too heavy and enough power for me (I've been using a 034AV for ~10yrs)

034AV - 5.3kg (11.7lb), 3.0kw (4bhp) @13000
565 - 6.5kg (14.3lb), 3.7kw (5bhp) @9300

Truth be told, the 034 suited me just fine but I sometimes came across a situation where a 20Ē would have been useful.
A few days ago the clutch on the old workhorse disassembled itself leaving me with nothing to perform surgery on a 30yrs dead, 20Ē Blackwood which had blown down on a friend's property.
I can rationalise a Ďwantí into a Ďneedí as well as the next man so I went looking.
I like to be in control of what the motorís doing and have been left helpless by microprocessors before so I wasnít keen on the M-Tronics and Autotunes being foisted upon us. The local Stihl agent had just sold his last MS391 - not getting any more, so I visited the Husqvarna agent, though I had a prejudice against the inboard sprockets of Huskys and reports canning the air filters. He had just taken delivery of the 565 which seemed to have answers to all of my niggles - better seal around the air filter, outboard sprocket, improved Autotune. He'd throw in an extra chain, extra oils, 5yr warranty, dropped $170 off the top. What could I do?
So the 565 has 5yrs to prove itself - if it stuffs up Iíll be sure to let everyone know about it!

In the meantime I had this little issue about the mix to settle. If the agentís telling me albeit unofficially to use 25:1 he can hardly turn around and say ďYour faultĒ if it carbons up.
Iím not too hard on saws - not harvesting giant Mountain Ash or even running a mill so I donít imagine Iím in danger of cooking it from using too thin a mix.

32:1 might be a good compromise.

Offline lxskllr

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Re: AT fuel mix
« Reply #5 on: September 30, 2018, 06:43:40 AM »
I always used 32:1 in my poulan. Nice round number for mixing in my 1qt bottle. I bought some little bottles of Stihl ultra earlier in the year for my new Stihl and didn't consider the ramifications of that. It's setup for 50:1, so I mix it a little rich by leaving a finger of space under the marker on my 1g can.

I really don't think it matters. I've read tons of threads on chainsaw operation and maintenance this year, with people running mix ratios all over the charts, and haven't read anything that caught my attention one way or the other. Most fall between 32:1 and 50:1, so I'd run whatever in that range makes you feel better.

Regarding autotune... My new good saw is a 362cm. Works great, and it's a joy to use. Like you, I don't like having to depend on someone else to fix my stuff. On the other hand, I don't really like working on engines, and the electronics make it so I don't have to twiddle knobs to get it to run well. What *I'd* like to see is a usb port, and some software the user can use to at least troubleshoot their own gear. I can always dream, eh?  :^D

Good luck with your new saw! I'm sure you'll love it  :^)

Offline teakwood

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Re: AT fuel mix
« Reply #6 on: September 30, 2018, 08:14:34 AM »
Run 50:1

I run all my Stihl Stuff with 50:1 (only org. Stihl Oil) since 20 years and i never had a problem. Even the 088 chainsaw milling here in the insupportable hot tropic climate did just great with 50:1   
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Offline hamish

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Re: AT fuel mix
« Reply #7 on: September 30, 2018, 02:05:06 PM »
50:1 with good fuel and good oil.  Why would you want a leaner oil/fuel mix?
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Offline Southside logger

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Re: AT fuel mix
« Reply #8 on: September 30, 2018, 02:17:01 PM »
More lubrication with 32:1
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Offline sawguy21

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Re: AT fuel mix
« Reply #9 on: September 30, 2018, 06:57:45 PM »
With modern oil I am not convinced, the extra just accumulates as carbon on the piston and muffler. I run my 2 strokes on 50:1 using Stihl oil, it is locally available, and have yet to see a problem
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Offline Ed

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Re: AT fuel mix
« Reply #10 on: September 30, 2018, 10:42:15 PM »
All my 2 cycle ope get 50:1....oldest is an 020 Stihl from the mid 70's.

One has to remember, todays oils are vastly improved over the old 32:1 mix oil.

Ed

Offline John Mc

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Re: AT fuel mix
« Reply #11 on: October 01, 2018, 08:32:43 AM »
20 years of running 45 or 50:1 in all my 2 cycle equipment - even older stuff that calls for 32:1, and not a single lube-related problem. (the 45:1 comes from mixing in a jug where it's hard to see the fill level, so I tend to err on the low side when filling with gas, targeting 0.9, rather than 1 gallon. I figure if I'm off, I'd rather be a little low on the fuel mix ratio than a little high.)

Surprising - a thread on oil mix ratios, and Al Smith has not chimed in yet. I guess he's just sitting back, munching his popcorn and enjoying the show.
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Online mike_belben

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Re: AT fuel mix
« Reply #12 on: October 01, 2018, 09:20:59 AM »
  Saws have fans to shed heat.  They cant do that so well if they arent running.  Whatever mix you run, let the saw idle here and there.  The fins can only absord so much heat before the piston to wall clearance starts getting tight.  And in that moment when things are tight, more oil is never a bad thing.  

I put 50:1 in my tophandle and leaf blower.. Tools that dont tend to get hammered on.  40:1 goes in the firewood saw, 25:1 in the concrete saw and the 395 when milling.  Carbon i can tolerate, a wiped out MAHLE jug i cannot.  I let the 395 idle after every pass, and pause to oil the bar sprocket.  On 50:1 the saw was clinking and tinking when i first tried milling.  Way hot.  Plastic was smoking one day when it ran out of fuel. 
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Offline Woodcutter_Mo

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Re: AT fuel mix
« Reply #13 on: October 01, 2018, 10:15:39 AM »
 The only AT saw I have is a 550xp, I just use the same fuel I use in all my other saws and trimmers. 50:1 with good fuel and good oil (Red armor, XP oil or Stihl Ultra is what I use). I occasionally mix a 2.5 gal mix (6.4oz) bottle with 2 gallons of gas if it's what I have on hand.
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Offline DelawhereJoe

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Re: AT fuel mix
« Reply #14 on: October 01, 2018, 10:38:41 AM »
The 2.5 gal mix to 2 gal fuel is what I use, it was 32:1 for an old weedeater brand trimmer I had years ago but the fuel lines would junk out on me after 2-3 years on it. The Stihl equipment in the other hand never had a problem with the fuel bothering the lines.
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Offline Andyshine77

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Re: AT fuel mix
« Reply #15 on: October 02, 2018, 05:25:46 AM »
I always recommend at least 40:1 and in your environment with all the dry dusty hardwoods, more oil is definitely a good idea. On top of that strato saws use less fuel which also means less oil, they run on the hot side too.  
Andre.

Offline HolmenTree

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Re: AT fuel mix
« Reply #16 on: October 02, 2018, 09:10:32 AM »
Let the AT saws when hot idle for a minute before shutting them off.

I see the need for the next advancement in AutoTune and MTronic technology.... is a low fuel warning signal of some sorts.  ;)
Making a living with a saw since age 16.

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Re: AT fuel mix
« Reply #17 on: October 02, 2018, 11:48:32 AM »
I seems everyone is going to run what they're going to run...I like a little more oil, and I've had zero problems with carbon or plug fouling. I have had bearing failures when running 50:1. A grizzled old saw mechanic told me that bearing failures were unheard of in the richer mix days. So I run 40:1 and err on the rich side of that. If I was smoking out the woods, sticking rings and otherwise carboning up, I'd go to 50:1, but short of that I'll mix it rich.
Too many irons in the fire

Offline HolmenTree

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Re: AT fuel mix
« Reply #18 on: October 02, 2018, 12:19:03 PM »
Yeah back in the good old "leaded gas days" the lead offered some protection by itself.
Once in the 1970's on a hot summer day I accidently straight gassed my 621 Jonsered. It stalled out quick but after it cooled off and after I got some fresh 40:1 fuel mix down the spark plug hole and into the tank the saw went on like nothing happened.

Pulled the muffler a few days later to check the P/C and was glad to see not even a scuff.
Old lead gas did its job alright but I sure wish I never breathed that stuff into my lungs for all those years.
Making a living with a saw since age 16.

Offline pine

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Re: AT fuel mix
« Reply #19 on: October 02, 2018, 12:32:25 PM »
Let the AT saws when hot idle for a minute before shutting them off.

I see the need for the next advancement in AutoTune and MTronic technology.... is a low fuel warning signal of some sorts.  ;)
Got my first computer MTronic saw in July.  A Stihl 201T for climbing as the old one was worn out.  Did not want to go that way but no real choice anymore as that is all there is out there.
Your low fuel warning comment triggered a thought.
Why do you say that? Specifically.
I think I know...... but would like to hear it from you with your experience.

Offline HolmenTree

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Re: AT fuel mix
« Reply #20 on: October 02, 2018, 01:24:51 PM »
Let the AT saws when hot idle for a minute before shutting them off.

I see the need for the next advancement in AutoTune and MTronic technology.... is a low fuel warning signal of some sorts.  ;)
Got my first computer MTronic saw in July.  A Stihl 201T for climbing as the old one was worn out.  Did not want to go that way but no real choice anymore as that is all there is out there.
Your low fuel warning comment triggered a thought.
Why do you say that? Specifically.
I think I know...... but would like to hear it from you with your experience.
Ok, we're on the same page about letting a working engine idle some before shutting it off. :)
Low fuel warning on a ATune or MTronic is a no brainer after running one of these saws hard in the wood and then it stops abruptly from running out of fuel. 
The high  heat sink soaks in while you're refuelling and then when you go to start it with the choke on to get the fuel back into the carb(I even tried no choke only fast idle) it dumps extra fuel into the cylinder for protection from the high heat it is sensing. Flooded and lots of cursing to get it going again.
Was a time you had  a little warning when the saw needed to be refueled. These micro processors adjust right to the last drop with nothing to spare to let them cool down at idle.
My MS261CM does offer a short lean warning but easy to miss, 562XP not so good.
Making a living with a saw since age 16.

Offline pine

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Re: AT fuel mix
« Reply #21 on: October 02, 2018, 02:23:16 PM »
Got my first computer MTronic saw in July.  A Stihl 201T for climbing as the old one was worn out.  Did not want to go that way but no real choice anymore as that is all there is out there.
Your low fuel warning comment triggered a thought.
Why do you say that? Specifically.
I think I know...... but would like to hear it from you with your experience.
Ok, we're on the same page about letting a working engine idle some before shutting it off. :)
Low fuel warning on a ATune or MTronic is a no brainer after running one of these saws hard in the wood and then it stops abruptly from running out of fuel.
The high  heat sink soaks in while you're refuelling and then when you go to start it with the choke on to get the fuel back into the carb(I even tried no choke only fast idle) it dumps extra fuel into the cylinder for protection from the high heat it is sensing. Flooded and lots of cursing to get it going again.
Was a time you had  a little warning when the saw needed to be refueled. These micro processors adjust right to the last drop with nothing to spare to let them cool down at idle.
My MS261CM does offer a short lean warning but easy to miss, 562XP not so good.
Ok not where I thought you were going to go with that.  More below on my thoughts.
Absolutely agree about the cool down issue.  I have been very meticulous for years about letting my saws get a cool down after a hard run before shutting down.  You are right, my brush cutters (FS450/550) I can switch the choke to rich and get them to run a little bit longer for a cool down but the chain saws (at least mine) not so easy.  At least you can hear the RPM's increase as they start to run lean so you get a little warning that the tank is going dry.
The issue with the 201T is that of the five 201T that have been sold out of my local dealer in the last 3 months, 3 have had issues ranging from annoying to failure to run.  The technician replaced the carbs on two of them and the problem went away---- for a while.  Now one of those has returned and basically won't run at all.  Two of the 5 have had no issues at all reported by the users.  
Mine has been intermittent.  Initially it would die around 50% of the time on idle down after a WOT run. After break-in was complete and I started to run the saw much harder the issue was reduced to dieing maybe 10% of the time.
I know the computer "learns" as time goes on (according to the tech) and if different users use it inconsistently then the computer has problems with basically being confused.
After checking with one specific Stihl rep, Stihl claimed that it was a fuel solenoid issue and that the carb did not need to be replaced just  the tiny little solenoid.  That was done to mine.  The next hour the saw ran great no issue. Problem resolved  -- or so I thought.  
As the fuel started to run out I heard the RPM increase as it went lean (yes the computer should compensate but I could still hear it just like with my other saws)  I may have let it go a little too long but it did not die in the cut.  After refueling the saw ran great in the cut but went back to the previous issue with dieing at idle as the RPM decreased or if it sat and idled for more than a couple of seconds.
I was hoping that your comment was going to say that there was evidence that the computer got confused/screwed up if it was run out of fuel thus making it run bad due to computer issues.  Thus never to run it out of fuel to avoid fouling up the computer on these new saws.  Back to the drawing board on our issue.

Offline HolmenTree

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Re: AT fuel mix
« Reply #22 on: October 02, 2018, 06:47:35 PM »
There's a  reason why these saws have transparent tanks to view the fuel level.
But easier said then done though when a guy is cutting in the thick of things.
Can't offer any advice on your MS201 besides there has to be a software update for it.
In my mechanical way of thinking a poor idle dropping off to dieing tells me the spark plug electrode gap is getting too wide.
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Re: AT fuel mix
« Reply #23 on: October 02, 2018, 07:50:02 PM »
"Was a time you had  a little warning when the saw needed to be refueled. These micro processors adjust right to the last drop with nothing to spare to let them cool down at idle."
Boy can I relate to that! The first time I ran out with my new 261CM - I had no idea what happened.. it was like someone reached in under my arm and flipped off the kill switch it quit so abruptly.  No stumble - no lean elevated rpm that I noticed - no cough or fart.. just flat quit - 'BANG'..
I had been cutting firewood a lot longer than my 290 would ever have gone on a tank of fuel and I really should have taken note of that fact and figured the tank should be getting down considering how much I had done with it - but in the heat of things it passed me by.
It did start back up after a quick refill, certainly a lot better than I expected after hearing some stories of how hard the M-Tronic deals could be to get back after running out though, which was good!
It really is an amazing little saw - overall I am stlhl (pun intended) impressed every time I fire it up!  

Offline HolmenTree

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Re: AT fuel mix
« Reply #24 on: October 02, 2018, 08:53:41 PM »
Yes knock on wood my new MS261 has been flawless too except once when it was working hard on a hot day in the upper '90s and ran out of fuel.
After refuelling I had to pull the rope about 5 times while holding the throttle wide open and it fired right up.

No big deal, I just thought it was saying to me "Take it easy! It's almost  100 F out here!"
:D

My 562XP wouldn't even have bothered to please me in that heat.
It wouldn't have bothered to run in the first place :D

:)  
Making a living with a saw since age 16.

Offline Al_Smith

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Re: AT fuel mix
« Reply #25 on: October 06, 2018, 05:40:45 AM »
Oh my goodness I go out of town for a few days and somebody resurrects the oil wars .I nearly missed it . :(

Offline ZeroJunk

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Re: AT fuel mix
« Reply #26 on: October 07, 2018, 07:38:19 PM »
The Stihl rep said that HP Ultra would work fine at 70 to 1 . The reason there is no consensus on oil mixes is because anywhere from probably 10 to 1 with an occasional fouled plug and 70 to 1 with good oil and it really doesn't make a flip.

So, you run 32 to 1 and everything works great and you swear that 32 to 1 is the obvious best choice.

And, of course ignore the fact that anything else within reason and you wouldn't have had any problems either.

Offline HolmenTree

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Re: AT fuel mix
« Reply #27 on: October 08, 2018, 08:45:26 AM »
There is still a 32:1 mix ratio on the chart of the Stihl Ultra mix bottle label.
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Offline Al_Smith

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Re: AT fuel mix
« Reply #28 on: October 08, 2018, 10:34:33 AM »
There is still a 32:1 mix ratio on the chart of the Stihl Ultra mix bottle label.
See I told you.If Stihl thinks it's a valid option and it's on the internet it must be true .They don't think that less is more why should anybody else ?
The great never ending oil debate or war whatever the case.Gotta love it 8)

Offline ZeroJunk

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Re: AT fuel mix
« Reply #29 on: October 08, 2018, 06:19:20 PM »
Why would anybody selling oil advertise that less will do the job. Other than Amsoil, who knows about them.
Why would anybody selling saws suggest anything that would cause them problems.

I suspect Stihl and Husqvarna have tested every way imaginable and if there was anything to running more than 50 to 1 they would be all over it.

But, people are perfectly capable of believing anything.

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Re: AT fuel mix
« Reply #30 on: October 08, 2018, 07:28:08 PM »
Went to get saw gas today.  Putting oil in the can I spilled a fair amount.  Didnt know just how much i spilled but I know less than half.  I added 1 gallon of gas.  I then added the proper amount of oil for 2 gallon at 50 to 1 to another can put in 2 gallons of gas and mixed the 2 cans together and should result in a slightly heavy mix.
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Offline Southside logger

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Re: AT fuel mix
« Reply #31 on: October 08, 2018, 07:32:13 PM »

Why would anybody selling saws suggest anything that would cause them problems.


The EPA. 
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Woodmaster 725 and 4000 planner and moulder
Enough cows to ensure there is no spare time.

Offline Al_Smith

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Re: AT fuel mix
« Reply #32 on: October 08, 2018, 07:51:42 PM »
The less is more thing goes like this .For reasons unknown some have suggested that heavier oil mixes lean out the fuel to air ratio causing a lean burn .The fuel to air mixture always had been controlled by the carb .Maybe somebody rewrote the book of physics and didn't tell me about it .
Where this idea that heavier mix ratios caused carbon build came from I really don't know .The old boat motors used 30WT oil mix at 16 to 1 and the only time they carbon fouled was running slightly above idle at trolling speeds .Even then you pull your lines and open it up.In about 5 minutes good as new .

Offline bandmiller2

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Re: AT fuel mix
« Reply #33 on: October 08, 2018, 07:53:52 PM »
I have mentioned this years ago. I was the mechanic for a medium sized fire dept. We would keep a can of mix and a can of straight gas on the trucks. When they weren't looking I would mix 100/1 Amsoil in the straight gas can so if they  dumped the pure gas in a saw no harm. We had some old two cycle Homelite pumps that called for a real rich mixture of oil something like 10/1. When they would take them out pumping I would give them a couple of plugs and a wrench, they would smoke and puke out the exhaust. I got fed up and put 50/1 in the tank kinda expecting to get some new pumps. The old homies thought it was ice cream they perked up and never ran better and are probably still running. Frank C.
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Offline Al_Smith

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Re: AT fuel mix
« Reply #34 on: October 08, 2018, 08:04:00 PM »
Look at it like this .Those old Homies running 10 to 1 could substitute as mosquito foggers while moving water therefore doing double duty in a way .You're probably right about still running some of that old stuff was designed to run forever .

Offline John Mc

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Re: AT fuel mix
« Reply #35 on: October 08, 2018, 09:52:26 PM »
The less is more thing goes like this .For reasons unknown some have suggested that heavier oil mixes lean out the fuel to air ratio causing a lean burn .The fuel to air mixture always had been controlled by the carb .Maybe somebody rewrote the book of physics and didn't tell me about it .
Where this idea that heavier mix ratios caused carbon build came from I really don't know .The old boat motors used 30WT oil mix at 16 to 1 and the only time they carbon fouled was running slightly above idle at trolling speeds .Even then you pull your lines and open it up.In about 5 minutes good as new .
The only time I've ever heard anyone make that argument was in the context of trying to convince someone to tune their saw to the fuel they are actually using, and if they switched fuel (whether changing the fuel/oil mix or changing from ethanol to non-ethanol gas), to consider adjusting their carb to match.
If the only tool you have is a hammer, you tend to see every problem as a nail.   - Abraham Maslow

Offline ZeroJunk

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Re: AT fuel mix
« Reply #36 on: October 09, 2018, 02:43:44 PM »
Some boat motors used plugs that did not have an over lapping electrode, just arced to the sides. I had one. A Force something or the other. And, they stayed fouled even at 50 to 1 .  I replaced them with a standard type plug and had no more problems. Didn't see any difference in performance and they didn't poke a hole in the piston. so, all good.

Online barbender

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Re: AT fuel mix
« Reply #37 on: October 09, 2018, 05:36:21 PM »
I have a 40 horse Mercury that uses the same style plug. I don't believe I ever fouled one. I did have an electrode fall off in my saw and destroy my p&c in short order, because the saw kept running. The plug was functioning just like those outboard plugs👎
Too many irons in the fire

Offline hamish

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Re: AT fuel mix
« Reply #38 on: October 09, 2018, 09:24:39 PM »
The less is more thing goes like this .For reasons unknown some have suggested that heavier oil mixes lean out the fuel to air ratio causing a lean burn .The fuel to air mixture always had been controlled by the carb .
True however most have missed the part in the book that tells that a richer fuel/oil mix results in a leaner fuel/oil mix, thus reducing the available fuel/oil mix for cooling and performance...........unless the carb is adjusted accordingly to account for the fuel/mix and air mixture from the carb.  Thats what many forget.
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Offline John Mc

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Re: AT fuel mix
« Reply #39 on: October 09, 2018, 09:40:36 PM »
The less is more thing goes like this .For reasons unknown some have suggested that heavier oil mixes lean out the fuel to air ratio causing a lean burn .The fuel to air mixture always had been controlled by the carb .
True however most have missed the part in the book that tells that a richer fuel/oil mix results in a leaner fuel/oil mix, thus reducing the available fuel/oil mix for cooling and performance...........unless the carb is adjusted accordingly to account for the fuel/mix and air mixture from the carb.  Thats what many forget.
Did you mean a richer fuel/oil mix results in a leaner fuel/air mix? I cold see that if it increased the viscosity of the fuel/oil mix - the carb would pull less of it through, if it were not adjusted to compensate. I'm curious how much of an effect that would actually have the difference between 32:1 and 50:1 mix amounts to an extra 1.4 oz of oil in a gallon of gas.
If the only tool you have is a hammer, you tend to see every problem as a nail.   - Abraham Maslow

Offline HolmenTree

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Re: AT fuel mix
« Reply #40 on: October 09, 2018, 10:36:06 PM »
So are we saying if we mix 10:1  compared to 50:1 the L and H speed screws need to be turned out to richen for the leaner gas to air intake?

I see it differently as I see the mix oil  mixed with gasoline being fuel to burn too. With a carb set for 50:1 with 10:1 mix lots of smoke is coming out of the exhaust and a leaner setting on the L H would be needed to get the rpm and  power up through a cleaner burn.
Making a living with a saw since age 16.

Offline HolmenTree

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Re: AT fuel mix
« Reply #41 on: October 09, 2018, 10:54:12 PM »
I see no potential lean seizure condition with extra oil when there is a stronger barrier of oil between the metal friction surfaces .
Reason my 40 h.p. 125 cc dirt bike engine runs 24:1 and with its one thin piston ring it needs that extra oil for a good ring to cylinder seal 
Making a living with a saw since age 16.

Offline Al_Smith

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Re: AT fuel mix
« Reply #42 on: October 10, 2018, 05:23:23 AM »
 8) ---see why I love the oil wars --- 8) 

Offline thecfarm

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Re: AT fuel mix
« Reply #43 on: October 10, 2018, 05:53:20 AM »
 ;D  ;D  ;D
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Offline Al_Smith

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Re: AT fuel mix
« Reply #44 on: October 10, 2018, 07:59:11 AM »
I suppose , ornery as I am ,
 I could get them on a kick of gasoline or maybe even racing fuel to use in  a standard old work saw .I won't though .Best to let that sleeping dog lie . :D
Then again it could turn into an interesting conversation comparing Ohio sour black crude oil to Venezuela light crude oil for feed stock .I'll have to think about it . 8) 

Offline Mad Professor

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Re: AT fuel mix
« Reply #45 on: October 13, 2018, 08:05:46 PM »
No E10, stirred not shaken.

Offline Gearbox

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Re: AT fuel mix
« Reply #46 on: October 14, 2018, 09:04:40 PM »
I run Amsoil Saber that is 100 to1 oil . I mix that at 50 to 60 to 1 My saw guy has had them down for other reasons and said they look great inside . The big plus is that when I start the saw the bugs all leave . I have a lot of hours on a 475 Poulan on my processer and never even fouled a plug . 
A bunch of chainsaws a BT6870 processer , TC 5 International track skidder and not near enough time

Offline Al_Smith

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Re: AT fuel mix
« Reply #47 on: October 15, 2018, 07:00:16 AM »
The only oil fouled plugs I've ever seen were caused by worn out impulse type oil pumps on McCullochs and one Lombard .This allowed bar lube to be sucked into the crank case and at times put a hydra lock on the cylinder in extreme cases .
More times than not in my experience  carbon fouled plugs will have dry black residue not oily .The cause is running too rich of the air to fuel ratio not the oil ratio .Which is not saying before somebody chimes in that it's okay too use some  outlandish ratio like 4 to 1 . 

Offline Southside logger

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Re: AT fuel mix
« Reply #48 on: October 15, 2018, 07:44:57 AM »
I think it's perfectly OK to run 4:1 gas to oil in a saw.  :D  Just be sure to use #6 oil as the mix.  ;D 
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Offline Al_Smith

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Re: AT fuel mix
« Reply #49 on: October 15, 2018, 09:16:49 AM »
Well I once used 140 WT gear oil in a worn out old Oliver crawler .It still blew blue smoke though lots of it .

Offline thedoublejranch

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Re: AT fuel mix
« Reply #50 on: October 19, 2018, 11:56:26 PM »
50:1 as long as I am using high quality oil rated for 50:1. What is that, about 2.6oz to a gallon.
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