Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hi, my name is***** will be assisting you.
No, it is not likely that the coil is the problem. If the coil were a problem most likely the machine would not run at all.
Have you checked the exhaust for blockage. The muffler screen and or the exhaust port on the cylinder could be partially blocked causing enough back pressure to keep the machine from coming up to full throttle.
Yes I checked for carbon build up and looked ok
I haven't checked fuel filter though
It could be the fuel filter, it may allow enough fuel to pass through to run a low speed but not enough to run at full throttle. Have you tried to run with the air filter off of the machine? Does it make any difference?