leifo
OPE Member
Just finished rebuilding this 660 for an arbor brother, received it with a busted piston and hole in crankcase. Advanced timing 8 degrees, opened up dual port muffler, port timing 95/122/79, squared up sides of inlet & exhaust ports, widened exhaust slightly and polished, took lip off lower transfers. First time dealing with a 660, what do you think of it's performance?
