50cc bicycle engine with Expansion Chamber muffler

Specifications

best price from the factory , no middle profit, 90 days warrenty

Latest Gen4 bicycle engine kit , USD54.85 for 48cc and USD57.55 for 80cc , direct bottom price from the factory supplier !

What is new and better for the Gen4 kit:

**** Expansion Chamber muffler with the clamps !

***New one piece crank , more weight and more balanced and more power.

***New cylinder with bigger intake air hole , takes engine more power.

***1.25mm enlarger size for the intake and exhaust , lead to more power .

***ISO crank shaft bearing, keep higher rotate speed and longer using time.

***High intension Alan screw .black or chrome as your wish.

***24C dual Connecting Rod Needle Bearings, more firm and stronger for the rod pin!

***Gen3 ISO carburator, bigger slide and jet , take engine more power.
***Spring idle pulley , give comfortable to the chain.

***415 Baihe ISO golden or black heavy Drive Chain, not easily broken any more.

***Half round chain link attached in the packing

***Longer alloy Clutch Lever with more hold open catch (new style).
***Chromed 9 Hole 44 Tooth Drive Sprocket !

We also supply the common cheaper bicycle engine kit, short black muffler and common carb and idel pullery kit !