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O.K. thanks. I'll give that a go and report back.

It's all back together and the carbon has been removed (fired) from the muffler and the spark arrestor. While the runing has improved somewhat it still won't rev out cleanly and the throttle response remains poor. Along with that, the only way I can get it to idle on its own is to screw the...

Thank you all. After removing the muffler I found no piston scoring so all good there. The spark arrestor was filthy and the muffler was carboned up as well. Muffler has been burnt out and after a light wire buffing the bulk of the grime on the arrestor was removed. I then dipped it in some...

Thanks for the feedback. The make is a Sthil and model is FS 55 RC as listed in the subject line. It has a new after market carb but runs exactly the same as it did with the O.E. Sthil carb. I'm checking it over for a friend. The fuel supplied by the owner is fresh (today) premix. My guess is...

This brushcutter starts and runs but wont idle and has no power. The only way I can keep it running is either by continually triggering the throttle, or slowly open the throttle to about 1/3 and hold it in place. From there it will run (sort of) but produces no power and will not rev out. The...