You're turning it counter clockwise right? How do you get that air intake off though? You pop off the air filter, then take two bolts out one on either side of the handle. Remove fuel line from primer bubble. Then..?
Anyone know about this 550xp fix?
- Thread starter jtc16
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There's a little plastic clip on the bottom right side of the carb.
Thanks
barton174
ArboristSite Guru
At first I tried out (counter clockwise), and that made it leaner/worse. What ended up working for me was going in 1/4-3/8 turn, which is clockwise. Right hand thread.
Mike
barton174
ArboristSite Guru
A quote of mine from this morning, from another 550XP thread in this section:
Unlike a regular carb, this isn't a fuel adjustment, directly. It's an air bypass, so the air bypasses the throttle plate. There's a cutout in the throttle plate right in front of the idle/midrange fuel metering orifices, where the air flowing by them sucks fuel through. It will do this at a certain rate, based on several variables (altitude, temperature/density, fuel/oil mixture thickness, intake 'manifold' vacuum, etc.). The adjustment to this is to have air get into the intake that doesn't pass across those metering orifices. This is the function of the air bypass needle/screw.
Chris-PA
Where the Wild Things Are
Thanks - I saw your quote in that thread and appreciate it. I also responded in that thread with a theory as to what is happening with these things.
barton174
ArboristSite Guru
By the way, for posterity, at 28F, I ended up finally getting the bog RIGHT off idle to go away at 1/8 turn from bottomed out. It was "sort of OK" most of the time by like 3/8-1/4 turn, but it finally got all dialed out by like 1/8 turn from bottomed. (it started out at 3/4 turn)
Mike
Mike
Chris-PA
Where the Wild Things Are
So is that closing off the bypass air like would be intuitive, or increasing it?
If the fix is always just adjusting air screw wouldn't the dealers all be doing it? Has anybody hooked saw up to diagnostic tools after to see what computer says now? I finally took 18" spruce log into dealer so he could play with 545 POS . So sick of it .550 XPG is perfect lol
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barton174
ArboristSite Guru
Depends. Some peoples' saws are rich and some lean, it seems, because some people open theirs up more and it works better, while some of them close them down.
it's not. There are several leaky saws in this era. Particularly the transfer covers, and I believe I've seen several with crank seal leaks. I tested mine, though, and it doesn't have any leaks.
Mike
This is a lean bog, so it makes sense to close the screw. IIRC, I closed it completely on the last one I did, in addition to modding the throttle plate.
Lmfaro, today I watch Ontario Hydro bucket truck worker with 550xp . He would feather throttle 3 times before making a cut[emoji23]. You could here wa wa wa then scream through cut. Got a buddy that works there in summer and almost all saws are 261 Stihl.
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