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Latest Gen4 bicycle engine kit , USD56.85 for 48cc and USD59.55 for 80cc , direct bottom price from the factory supplier !
What is new and better for the Gen4 kit:
***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 !
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