new member here jonsered 2172 question

[BFay2172]

Hey guys great sight I have been trolling for awhile and finally just wanna ask if anyone has any tips on how to get a little more power out of my jonsered 2172. Its a firewood saw and I cut a lot of red and white oak 30+ inch diameter along with cherry and elm. Its a great saw and I run a 24inch bar but I would like a little more umph in big wood

[mad murdock]

Welcome to the Forestry Forum!! 2172 is about the same as a 372 husky, no? Easiest way to get a little more power is a muffler mod. The other thing you can do is run .050" gauge low profile chain. Narrower kerf and gives a bit of an advantage. At least that is what some timber fallers out here in the PNW run on their bread and butter saws, up to a 395/660 sized powerhead. Anything really long barred or big cubes you need to run beefier chain. The. Again maybe consult with loggers in your area, PNW softwood cuts easier than N red oak.

[Andyshine77]

A muffler mod is a great idea. If you really want more have the saw ported. 3/8 chisel chain is going to be the most efficient on a 70cc saw. Even a good 50cc saw will be better off with regular 3/8 chain from what I've found in my testing and experience.

Remember, it doesn't matter how much power you have if it's not put to use correctly, so keep your chains properly sharpened.

[clww]

Welcome to the Forestry Forum.
Another way to gain more power is to use that 3/8" chain with a 20" bar.

[Spike60]

Where'd you get it and was it properly set up? These saws need to be adjusted when they come out of the box, both hi a lo. Should have no problem pulling a 24". Muffler mod is inexpensive and yields some gains. Porting gets a little more, but most guys report that this new version doesn't respond as well as the 2171. The improvement might not be worth $250 plus 2 way shipping.

[BFay2172]

Thanks for the replies! The saw runs and cuts great it just has its hands full when I'm cutting big oak. I might have the chain sharpend with the rakers a bit aggressive its pretty grabby after I sharpen it but I'm no profesional at sharpening. I bought the saw from a smaller shop that a friend of mine works at. The owner pulled it off the shelf gassed and oiled it and started it and said they were pre tuned from the factory which I thought was weird but I didn't argue.

[BFay2172]

Mad Murdock yes the saw is the red version of the husky 372 which is originally what I was going to purchase but jonsered was having their bag it and drag it deal where they give 150 off a new saw when you trade a old one in. Poor eager beaver got traded in  :D. The saw has about 15 tanks of gas through it also so I would think its broken in.

[FWPT]

1. Remove muffler
2. Remove screen from muffler
3. bend deflector as to allow more flow
4. Enlarge opening using a rotary tool and small carbide bit
5. Reinstall screen and muffler
6. Retune carb
7. Enjoy some extra power

optional:

8. add 5/8" hole in upper front(chain side) of muffler
9. Install 288xp defector and screen with self tapping screws
10. Retune carb yet some more
11. Enjoy even more power

p.s. always clean out metal shavings with soap and water before re installing muffler

[Spike60]

The owner pulled it off the shelf gassed and oiled it and started it and said they were pre tuned from the factory which I thought was weird but I didn't argue.

NO NO NO! Go back and argue. Politely, but argue my friend. That saw is likely running a little on the lean side.

I'd suggest you open up the hi 1/4 to 3/8 turn if you can. You'll find some of your missing power. 

[BFay2172]

FWPT I bought the 288 deflector and screen a month ago and just haven't had a chance to tear into the muffler thanks for the run down of how to do it saves me from asking!
Spike60 I know I should have asked more questions about it But when I asked about tuning it he said their was no need. A friend of mine is certified in small engine repair so ill have him put the tach on it an make sure I have it set right. Is it turn out for more fuel? I try not to play with things I'm not real familiar with to avoid wrecking something. Thanks for the responses!

[Andyshine77]

Yes turning the Low and High screws counterclockwise feeds the saw more fuel. I wouldn't mess with the low screw if it idles fine and accelerates without any hesitation. Like Spike said almost every saw come tuned lean from the factory, so opening up the H is a must the vast majority of the time. 

[BFay2172]

 

   Here is the saw with its 28" bar it wears sometimes when I'm cutting big soft wood generally boxelder on fench lines.

[BFay2172]

Thanks! I should have had someone tune it for me right away but I want to learn how to do it myself so I don't have to always ask for help.  This forum is a great place to learn and has already been extremely helpful!

[thecfarm]

BFay2172,welcome to the forum.

[ehp]

I have ported most likely 20 or so of these 365/372xt and have zero problems and they perform better than the old style xp as they make more torque , sure in 8 by 8 a 372xp ported most likely would beat a 372xt ported but in 20 inch plus oak the xt will walk all over the xp , The xt saw has more torque stock but the powerband rpms is lower so you need to get those rpms up with out loosing any torque , Mine under load turn about 12,200 rpms in the wood and thats under a good load . So if you need more power get someone to port it

[BFay2172]

 

 
Got the muffler modded tonight but didn't get a chance to adjust the carb its hitting the limiters. I was reading the thread posted about a  husqvarna are the carbs set up the same or is there a different way to remove the limiters on a jonsered?
Ehp if this doesn't help much I have been considering getting it ported. Thanks for the responses! Sorry for the silly questions I'm very new to modding and tuning saws.

[Spike60]

p.s. always clean out metal shavings with soap and water before re installing muffler

Local guy decided to try a muff mod. Drilled some holes in his muffler without even taking it off the saw. Quickly wiped itself out.

[SawTroll]

I assume the larger RWJ carb of the XT will work really well in combination with a ported  51.4 mm xpw top end - but it is getting a bit expensive, and I am no expert....

[Huskstihl]

Also be aware that your saw really isn't an all day 30" oak saw.  Skip chain and a muffler mod/good tune will help.  A really good chain is probably the best thing you can do

[BFay2172]

I made sure to clean the muffler out really good before I reinstalled it on the saw.
Huskstihl I know its not an all day saw for big oak and I generally don't have a lot 30+ inch that I cut but I have 2 very large red oaks to cut both being around 50 inches on the butt I'm guessing. It rips through the smaller oak and cherry and maple that I cut a lot its just a little under powered in the real big stuff. Can i push the limiter caps in and adjust how i need to? Thanks for the responses guys Im learning alot here already.

[Andyshine77]

I have ported most likely 20 or so of these 365/372xt and have zero problems and they perform better than the old style xp as they make more torque , sure in 8 by 8 a 372xp ported most likely would beat a 372xt ported but in 20 inch plus oak the xt will walk all over the xp , The xt saw has more torque stock but the powerband rpms is lower so you need to get those rpms up with out loosing any torque , Mine under load turn about 12,200 rpms in the wood and thats under a good load . So if you need more power get someone to port it

Completely disagree with Ed on this one, the non XT saws make more power end of story!! Not even close IMHO!! But then again I don't make money on porting POS saws, so what do I know. 

[SawTroll]

I have ported most likely 20 or so of these 365/372xt and have zero problems and they perform better than the old style xp as they make more torque , sure in 8 by 8 a 372xp ported most likely would beat a 372xt ported but in 20 inch plus oak the xt will walk all over the xp , The xt saw has more torque stock but the powerband rpms is lower so you need to get those rpms up with out loosing any torque , Mine under load turn about 12,200 rpms in the wood and thats under a good load . So if you need more power get someone to port it

Completely disagree with Ed on this one, the non XT saws make more power end of story!! Not even close IMHO!! But then again I don't make money on porting  saws, so what do I know.

Well, he didn't even mention the 51.4 mm version of the non-xt 372xp, that he used to say beat the 7900, when both were ported....

I suspect the larger carb of the xt, combinened with the non-strato 51.4 mm top end would be a winner! 

[ehp]

Andy you must of not seen or run any good XT's , hell I got guys parking their ported 395's  built by other people cause the ported 365/372 XT were faster plain and simple and I donot make money porting saws , playing with saws has always cost me money but I like to play with them, But I do make my money using my ported saws everyday unlike most that cut a tree here or a tree there , I cut and skid by myself  30,000 to 50,000 feet of hardwood logs per week and thats every week not once in a while  and thats a fact , just ask either sawmill here and they will tell you , For every saw I port I turn down 25 or more , I'm just not interested in all the BS , I mostly build saws for friends now and any one that has run one of my XT's will tell you they flat out haul hard or you could just come up and we will try your xp against one of my XT's in a 30 inch plus white oak and see how it fairs , if you want to go bigger I got bigger white oak here to

[Andyshine77]

Andy you must of not seen or run any good XT's , hell I got guys parking their ported 395's  built by other people cause the ported 365/372 XT were faster plain and simple and I donot make money porting saws , playing with saws has always cost me money but I like to play with them, But I do make my money using my ported saws everyday unlike most that cut a tree here or a tree there , I cut and skid by myself  30,000 to 50,000 feet of hardwood logs per week and thats every week not once in a while  and thats a fact , just ask either sawmill here and they will tell you , For every saw I port I turn down 25 or more , I'm just not interested in all the BS , I mostly build saws for friends now and any one that has run one of my XT's will tell you they flat out haul hard or you could just come up and we will try your xp against one of my XT's in a 30 inch plus white oak and see how it fairs , if you want to go bigger I got bigger white oak here to

If I can run your fuel sure! JK. Ed the 372xt saws haven't done all that well down here, Spike can fill us in there. I've yet to run a ported 372xt that can run with a good old 372. Some guys are getting much bigger gains than you were back in the day. The 372 you made me is a strong runner, but nothing like some others I've ran and ported. Good work saw nonetheless. Some guys are pushing compression too far for a work saw IMHO, but running 32:1 seems to help. Sill prefer my EHP7900 over any 372 for some reason. ;)   

[ehp]

I can make alot bigger gain or hotter saw  but that is not a worksaw nor will it ever live in real world cutting , a cookie cutter is just that , a cookie cutter , I learnt my lesson a long time ago to only build a saw that is a worksaw cause they always ask for the fastest you can build then they sell the saw to a guy cutting firewood or to a guy that is putting the saw on a mill so how long is a cookie cutter going to last in that job , very short life span . I know all about the main bearing flying out of the XT's but I tell everyone of the guys running mine to use lots of oil and I have had Zero bearing problems and I got 2 logging gangs up north that have about 1 1/2 million feet on their XT's , The saws I have been building in the last couple years are all pretty much for loggers not weekend warriors so the saws get alot of use , if you want to see a saw that will blow your mind then come and run one of my own saws like my 562 and as far as fuel goes I doubt if our fuel is any better than yours