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stihl chainsaw help

T

teachingscience

Member
So, I recently put a carb kit in my MS280 and a new coil. Now after a heavy cut it revs for about 10 seconds. Its dangerous and almost caused a kickback once when I pulled out of a log after a cut. I have adjusted it every way I can and not improvement. Another thing thats strange, I can screw the high jet in completely and it still runs fine except the revving. Any wisdom you can share would be appreciated.

Charlie
 
Assuming you have checked the throttle cable function, that the throttle is closing under real world conditions, all the covers on, etc.

Could have a vacuum leak, check the gasket, everything between the carb and the engine. Could also have a crankshaft seal leaking.

That it will run with the high adjust all the way in says the fuel is getting through the carb someway other than the main circuit. Might look on Ebay, sometimes you can get a new carb very reasonable.
 
Not familiar with your model but your statement---[b:ea081cfe86]"I can screw the high jet in completely and it still runs fine except the revving"--[/b:ea081cfe86]suggest that you have a carb problem. Check to make sure gaskets are installed in right order and that the adjustment screws are in their correct positions (not switched).
With most Zama carbs, the sharp pointed adjustment screw should be in the "L" screw hole.(closest to intake)
 
Looks like you got it right. I did find a large tear in the boot. Have the new part but haven't had time to install yet. Hopefully that will fix it. Thanks to everyone who replied.
 
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