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Hi, it won't affect the carby which I'm afraid is the only good news. It will need a new piston and probably a cylinder. Depending on the price of these parts to suit your model it may not be worth repairing. Sorry Phil.
Remove the air cleaner and watch the throttle arm on the carburetor while operating the throttle trigger--suspect that the trigger assembly has acquired sawdust and dirt sufficient to limit proper travel of the trigger mechanism. Careful notes as you dis-assemble the trigger will help get it back together properly. There is little except proper maintenance to prevent debris accumulation in the trigger mechanism. Note: air leakage behind the carburetor can also cause high idle speeds--make sure the carburetor is fastened securely and that there are no flaws in the gaskets and heat insulator located behind the carburetor. Hope this helps!
Sawdust/dirt build-up helps cause this situation. Usually, the band is deformed so that it drags. The melted case parts may or may not need replacement, but will likely need trimming. The band usually does as it is difficult to remove the small bends in it. After repair, make sure the chain turns freely by hand. Set and reset the brake several times to make sure it works correctly. The clutch outer drum rarely deforms when this happens. Hope this helps!
A COMMON PROBLEM FOR A CHAINSAW OVER 2 YEARS OF AGE IT IS USUALLY THAT A WIRE HAS BUSTED THAT NEEDS REPLACING CHECK FOR ASSISTANCE IN THE MANUAL IF YOU STILL HAVE IT THERE SHOULD BE AND AFTER CARE PHONE NUMBER FOR FURTHER ASSSISTANCE
1. Is there a Homelite/Ryobi dealer/authorized repair facility near you? If yes I'd try them they may repair it. 2. Any major chainsaw seller/repairer may be able to repair it... there will be a fee. Lou I own a few chain saws without chain brakes. I also own and use good PPE.
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