Modified Muffler- Walkerized?
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sedanman
Just cut the piano!!
You have heard this a million times:"an engine is just an air pump". If you make alterations to how well it exhausts, you MUST verify the intake. It definately needs to be adjusted. The high side is certainly lean at this point, low side might be too.
Lawn Masters
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After having your muffler modified you should always set ihe H screw on your saw slightly richer, this will help to prevent lean seizure in your saw.
oldsaw-addict, am I going to have to spend all my time policing you here? I hope not. You've read a lot, didn't you see where the MS260 doesn't <i>have</i> an H screw? It was rumored a while ago that Stihl was going back to them, but I haven't heard of any being spotted in the pipeline yet.
Brian, my documentation shows that carburetor has a fixed high speed jet and that the low speed circuit gets its fuel feed <i>after</i> that jet. In carburetors where the low speed circuit is independent, opening the low speed jet will add fuel throughout the rev range. In these newer carburetors, the low speed jet will not admit any more or less fuel at full throttle, regardless their setting.
You can enrich the mixture by drilling out the jet or replacing it with an oversized part. Perhaps you'll be able to do all you need by raising the inlet lever slightly. The surest bet would be to acquire a WT-426 carburetor, either new or used (and swap the compensating diaphragm covers with your old one) so you can fully re-live the past.
Glen
Brian, my documentation shows that carburetor has a fixed high speed jet and that the low speed circuit gets its fuel feed <i>after</i> that jet. In carburetors where the low speed circuit is independent, opening the low speed jet will add fuel throughout the rev range. In these newer carburetors, the low speed jet will not admit any more or less fuel at full throttle, regardless their setting.
You can enrich the mixture by drilling out the jet or replacing it with an oversized part. Perhaps you'll be able to do all you need by raising the inlet lever slightly. The surest bet would be to acquire a WT-426 carburetor, either new or used (and swap the compensating diaphragm covers with your old one) so you can fully re-live the past.
Glen
Glens,
My 260 is about 6 yrs old or more. It has the adjustable carburator. I know you can adjust the "L" and if my memory serves me correct there is an"H" adjustment on it as well. I will have to go and look. So basicaly I should back down the "L" screw about a quarter turn to one half(about). And increase the "H" screw about the same.Thanks guys!!
My 260 is about 6 yrs old or more. It has the adjustable carburator. I know you can adjust the "L" and if my memory serves me correct there is an"H" adjustment on it as well. I will have to go and look. So basicaly I should back down the "L" screw about a quarter turn to one half(about). And increase the "H" screw about the same.Thanks guys!!
sedanman
Just cut the piano!!
Anyone who can tell you how many turns to adjust your carburetor without ever hearing it run is a god, they may just be the one true GOD. What you need to do is read all you can on how to adjust a 2 cycle caburetor and then do it, or bring the saw to a shop and have them do it. If not adjusted properly the carb on your saw will cause perofrmance problems or death to the saw. I'm not bashing here, it's cheaper to pay someone to set your carb than it would be to sieze it.
Brian,
Sorry about the mixup, by the time it became the MS260 the fixed-jet carb was a fixture already.
See http://www.madsens1.com/sawtune.htm for one description and a couple audio files.
sedanman's absolutely correct. Nobody can tell you what adjustment to make sight unseen, sound unheard.
Glen
Sorry about the mixup, by the time it became the MS260 the fixed-jet carb was a fixture already.
See http://www.madsens1.com/sawtune.htm for one description and a couple audio files.
sedanman's absolutely correct. Nobody can tell you what adjustment to make sight unseen, sound unheard.
Glen
jokers
Addicted to ArboristSite
Brian,
Where in CNY are you? Where did you buy your saws? I could recommend a shop or two to set your carb if you`d like.
Russ
Where in CNY are you? Where did you buy your saws? I could recommend a shop or two to set your carb if you`d like.
Russ
Lawn Masters
Addicted to ArboristSite
Sorry Glen, I forgot the MS260 and some of the older 026's have fixed jet carbs, my mind got away from me.
Yeah, I thought about what I posted after I wrote it and thought about how dumb it was. I know the only way to set the carb is by ear or tach. I have a saw shop I trust about 20 minutes away, Commercial Cutters Direct. The other local saw shop CNY Power probably could not even find the carb. I will have it adjusted right. I can do a pretty good job by ear but I don't want to toast this saw.
Thanks for all of the replys!!!!!
Thanks for all of the replys!!!!!Where is the best place to buy a 2 stroke/ 4 stroke rpm guage. I know stihl makes one for $120. I was looking for something digital and for a little less. Is there anything that can be bought at a shop without having to order one. The only ones around here are the 2 stroke chainsaw ones. I need the 2/4 stroke model. Thanks. I live outside of Syracuse New York.
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