The engine works perfect at all range of rpms but at high rpm there is a strange mechanical sound,if you close the throttle a llitle the sound stops.
What do you suggest...maybe is a bearing or a throttle sensor calibration???
Hard to say without hearing it, can you post a utube video?
It could be a bearing going bad, remove the flywheel cover and see if you can move the flywheel up and down or sideways. Remove the plugs and turn the flywheel by hand and listen, feel for anything bad. Do you know how many hours are on the motor?
DT30C model 1991 noice at high RPM
Linear Mode
