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Had an RM65 (I.e. KX65 clone) for my older son back in the day. With a small amount off the cylinder base it went from hard hitting power and to super tame at lower RPMs. And then pulled cleanly into midrange.
Hayden did ok on our turn track with just the flywheel weight but on the jump track, the "hit" scared the crap out of him and he was afraid to jump anything. Sunday I installed a washer in the pipe that was 38mm OD x 20mm ID and choked it to about 3/4 of the normal exhaust port. That was just about the perfect fix as it choked off the hit a little and seemed to bump the low end and make the overall powerband much smoother. Definitely better than the 12oz FFW.
It seemed to be loaded up at low RPM on Monday and was spooging out the silencer pretty bad but he was way more comfortable on it and jumped everything by the 3rd lap. Today I leaned the pilot from 25 to 20 and installed a hotter plug, BR9 instead of BR10, and it was crisper with no more spooge yet still pretty fast. IMO, that's the way to set up a 65 to transition a kid from a play bike to a 65.
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