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1974 Honda ST90

After treating my son’s 1974 Honda ST90 (which is a 89cc four stroke engine) we saw a faster top end, and a quieter engine at idle. Top end was about 38mph with my light weight son on it now it will top out at about 41mph. Along with a quieter engine it also eliminated alot of engine vibration.

John B Small Engine September 18, 2016