docgabby
Super Veteran
maybe you can show us picture that the 5 speed gearbox can fit the 4 speed crankcase. what I know is the 4 speed model has a different crankcase design compared to the 5 speed model. their bottom ends are different. unless of course they have designed a 5 speed gearbox for the 4 speed model. haven't heard or seen one.4speed convert to 5speed only if use hand clutch