Bye Bike 47mm "70cc" Engine and Swing Arm forks These are 39mm x 2mm

These are 39mm x 2mm GI style

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

Nice chrome turn signal switch

you're probably going to run out of case material trying to match the transfers

You don't find these very often

Bye Bike 47mm "70cc" Engine and Swing Arm forks These are 39mm x 2mmNew 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