120AX Special from O.S. Engines

摘要

The 120AX Special has the same mounting dimensions as the original, but delivers nearly 10% more power. For starters, the crankshaft port timing has been modified to increase power at high rpm. The velocity stack on the carb adds acceleration at high rpm while a 0.1mm head gasket increases compression ratio for more power. Pair the 120AX Special with an O.S. E-5020 muffler.