URGENT! I am currently trying to break in my AR-21 engine, 20% fuel, throttle all way closed and air filter on etc etc. Except it keeps revving up on it's own with out the throttle moving a hairs width? Any ideas?
It was probably more to wards the 1mm side of things, I have tried turning the idle screw down to no avail. When all the wheels are off the ground it justs begins to rev up like it's on full throttle. I'll try the low speed needle now thanks
