Bye Bike 47mm "70cc" Engine and Swing Arm forks Mounting bolts are vertical and

Mounting bolts are vertical and 62mm apart

Now you won't have to stop and lay your bike on its side to get those last few drops of gas

New old stock mudflap for Derbi

These do NOT come with all of the case bolts

The squish on these heads have been modified to best fit these cylinders

Bye Bike 47mm "70cc" Engine and Swing Arm forks Mounting bolts are vertical andNew old stock 70cc engine for the Bye Bike series of mopeds. This is an excellent candidate for engine swapping onto another moped. This engine has a factory 47mm cylinder kit which has the same port map as the popular Derbi Airsal kit. Tecnigas used Top Racing parts for the scooter style transmission and Airsal reeds that are the same pattern as Tomos A35 with a pretty generous intake. These engines make excellent power as they are. Engines are