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hi I have a 20hp single cyclinder kholer courage engine on my mower its about three years old and been took care of and allways run fine but latey after you mow about 21/2 or 3 hours its starts to run bad its starts to bogg and pop and run rough and I can choke it some its runs fine again as...

I'm working on a ht101 sthil 4mix pole saw it want RPM up when you pull trigger it cranks and idles but that all but after it runs about minute it will start to rpm up some if you hold trigger wide open, I have change plug adjusted valves clean carb and than tried new carb try it with muffler...