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Author Topic: It's alive...kinda...  (Read 2859 times)

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Offline weimedog

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Re: It's alive...kinda...
« Reply #20 on: June 27, 2015, 09:32:49 PM »
You have it under control. If the saw dies with a little spray on that junction .. its leaking.  .054 is a typical squish for a stocker. It's not unusual to see problems with that carb to boot issue. One of the "other" video guys did a video specifically on that topic. There is no acceptable leak there...if it leaks it needs to be replaced. As bob pointed out sometimes that bracket is compromised and needs to be replaced. If there is a question it's cheap insurance to replace that intake system. I hate to bring another variable into the equation...last year I had a rash of walbro carb issues where I could get the saw to start but could not get it to run right. AND the first one that frustrated me was a 365... a new carb solved its problem. But the symptoms were hard to start, could not get it to idle properly under 3k, and it acted lean on the high end to add insult to injury.


mweba's cut on those intakes... a good video. One of MANY from him BTW
Husqvarna 365sp/372xpw Blend, 365/Huztl 52mm build (Cyclops),562xp "HTSS", 272XP, 61/272XP, 555, 257, 242, 238, 440e, Homelite 540, S-XL 925, XP-1020A, Super XL (Dad's saw); Jonsered 2094, Three 920's, CS-2172, 49sp, 621; Solo 603; 3 Huztl MS660's (2 54mm and 1 56mm)

Offline weimedog

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Re: It's alive...kinda...
« Reply #21 on: June 27, 2015, 09:43:11 PM »
BTW I haven't seen the Huztl aluminum parts...except as a clamp on the old "square" style 365 intake that has that clamp & two screws vs. the later "round" intake port casting & clamping system. So now I wonder WHICH 365 intake system you have... I was assuming the same intake system as the 372's... do you have the "square" style intakes?? Could you post a picture?? Obviously they can't be interchanged. Wouldn't change the prognosis though other than the fact that the later closed port 365 should stronger than the open port ones.
Husqvarna 365sp/372xpw Blend, 365/Huztl 52mm build (Cyclops),562xp "HTSS", 272XP, 61/272XP, 555, 257, 242, 238, 440e, Homelite 540, S-XL 925, XP-1020A, Super XL (Dad's saw); Jonsered 2094, Three 920's, CS-2172, 49sp, 621; Solo 603; 3 Huztl MS660's (2 54mm and 1 56mm)

Offline kellysguy

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Re: It's alive...kinda...
« Reply #22 on: June 28, 2015, 09:47:23 AM »
BTW I haven't seen the Huztl aluminum parts...


Mine is round, here's the part.


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Offline Spike60

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Re: It's alive...kinda...
« Reply #23 on: June 28, 2015, 10:18:56 AM »
On this spraying around the carb debate it's worth pointing out that if you really douse the thing with whatever spray, the carb will ingest some of it where the throttle shaft goes through the carb body. Particularly on an older carb. Again, you can get some false impressions from this. And I think this discussion is getting a little too hung up on this spraying the boot deal, and we aren't looking at everything else. Wanna do it by the book, then you need the mighty vac and the saw must hold both pressure and vacuum. That boot may indeed be a problem, but it would result in some annoying running issues, besides the lackluster performance.

Does the saw hold steady at hi RPM's? An air leak present will make that almost impossible to do, as it will want to rev higher and higher. Also it will not idle for very long without starving for fuel. What's the plug look like? White means running lean caused by a small air leak or misadjusted carb. Gray oily stuff everywhere means a huge air leak as in a torn boot or blown seal. (and death is near!) But a leak that bad would be a saw that's a lot worse than just sluggesh when you try to run it.

Adapter on a gage usually means low readings, so I'm thinking the actual compression is little better than 135. Not sold on 54 being representative of a stock squish number though Walt. Think we might need to increase the data sample there.  :)  But I think you are on the right track with the carb being a potential problem. Especially if it's one of the Zama carbs. The Walbros are far better on this chassis. (opposite on the 357 chassis).

And what exactly is meant by sluggesh? Is it simply disappointing when you run it with no other indications that something's wrong? Is it attaining full RPM's. If it won't rev up, that's not indicative of an air leak. I'm still thinking it's a carb or compression issue. Not all carbs can be fixed with a kit and cleaning. Damage or oxidation to the carb body means it's junk. Perhaps the cylinder needs a little more cleaning/attention? New ring needs some break in time? Lot's of possibilities.  ???

I built one of these saws using the recipe that Walt mentioned earlier, plus a little work removing the cylinder skirt between the transfers. Built it on an old, tired and banged up 371 chassis. This saw rips and will easily outcut a stock 372, so you should be anything but disappointed when you get this sorted out.     

And another thought: Did you center the crank when you replaced it? 372 chassis really isn't as fussy with the crank as most other saws, but it still needs to be addressed.

And a second another thought: Did you remember the small o-ring that goes on before the oil pump gear bushing?

Husqvarna-Jonsered
Ashokan Turf and Timber
845-657-6395

Offline kellysguy

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Re: It's alive...kinda...
« Reply #24 on: June 28, 2015, 11:03:17 AM »
Cranks right up, idles well, holds high RPMs. Pulled the metal ring out of the intake and it seems to be sealing better. Isn't the top of the carb vented? Might be pulling through that. The throttle doesn't seem as responsive as it should be. That being said, this is m first "big" saw and maybe they just act that way. My little poulan snaps up and screams when you blip the throttle but that not even a fruit much less an apple or an orange.

I didn't hone as I've read some ring manufactures don't require it (automotive) and I didn't want to take a chance of hurting the plating. Lord only knows how thin that stuff is now as this saw has seen LOTS of past use on a CM. I think I'll just give it a light scuff with 220.

Walbro carb and what's up with that little channel cast into the back of the body right by the screw hole? That's a vacuum leak waiting to happen! I ordered the aluminum Huztl flange. At this point it's becoming more of a "toy" than a tool. (Do they make carbon fiber covers for these yet?  :D )

The more I work on it, the more I like the layout (other than having to pull the cylinder for the boot ::)).

I think I need a 50cc pro saw and there is a 55 about two hours away that needs a little work for not too much money. ;D

Offline weimedog

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Re: It's alive...kinda...
« Reply #25 on: June 28, 2015, 01:26:00 PM »
That chassis is fun...I think the best fun per dollar chassis for a saw hobbyist.... Certainly the most POWER per dollar in the saw world for the typical tinkerer  who has skills and Lowes near by but no machine tools.

Bob dropped a 371/372 basket case like a bomb into my saw world a few years back... it ended up being the original "Farmer Jones" build with 1194 base gasket, muffler mod (3/4 in tube brazed in the upper clutch side corner) , Single ring 371 OEM piston, and that one had a .040in lower intake port.....it's in the hands of a young fella who heats his home with wood. He bought it a year ago...I dropped a lot of timber with that saw!  Interestingly enough and why I hooked onto this thread, my current favorite saw is my original 365 bought back in around 2003/2004 built with a 372xpw top end... (yea there is a video...)
Husqvarna 365sp/372xpw Blend, 365/Huztl 52mm build (Cyclops),562xp "HTSS", 272XP, 61/272XP, 555, 257, 242, 238, 440e, Homelite 540, S-XL 925, XP-1020A, Super XL (Dad's saw); Jonsered 2094, Three 920's, CS-2172, 49sp, 621; Solo 603; 3 Huztl MS660's (2 54mm and 1 56mm)

Offline Spike60

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Re: It's alive...kinda...
« Reply #26 on: June 28, 2015, 01:47:13 PM »
OK, how 'bout a 3rd "another thought".  :)  I'll keep 'em coming until we get this thing fixed.

Have a look at the throttle cable right where it goes into the trigger. Sometimes the cable sheath will begin to wear and peel back at this spot and the result is that it won't fuily open the throttle when you pull the trigger.
Husqvarna-Jonsered
Ashokan Turf and Timber
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Offline weimedog

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Re: It's alive...kinda...
« Reply #27 on: June 28, 2015, 10:30:12 PM »
A relevant video...:)

Husqvarna 365sp/372xpw Blend, 365/Huztl 52mm build (Cyclops),562xp "HTSS", 272XP, 61/272XP, 555, 257, 242, 238, 440e, Homelite 540, S-XL 925, XP-1020A, Super XL (Dad's saw); Jonsered 2094, Three 920's, CS-2172, 49sp, 621; Solo 603; 3 Huztl MS660's (2 54mm and 1 56mm)

Offline weimedog

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Re: It's alive...kinda...
« Reply #28 on: June 29, 2015, 05:03:44 AM »
And a bunch of video moments from past video's stuck together for this particular thread...



Husqvarna 365sp/372xpw Blend, 365/Huztl 52mm build (Cyclops),562xp "HTSS", 272XP, 61/272XP, 555, 257, 242, 238, 440e, Homelite 540, S-XL 925, XP-1020A, Super XL (Dad's saw); Jonsered 2094, Three 920's, CS-2172, 49sp, 621; Solo 603; 3 Huztl MS660's (2 54mm and 1 56mm)


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