i'm trying to get a little more speed out of a 2cycle 50cc engine. the bike manual states 30-35mph as top speed. after about 22mph the engine starts producing high frequency vibrations.
any pointers? is is just a worn engine? would increasing the oil mix help? (mini is a '72 suzuki trailhopper, (MT50J) with a 3 speed centrifugal transmission and oil pump.)