Top-Racing is the specialist for high-quality crankshafts from Portugal, which also manufactures the famous long-stroke shafts for the Piaggio Maxis! Thanks to the years of experience and state-of-the-art production machines, the HQ shafts are a first-rate choice for your engine. The design corresponds to a full crankshaft ! High-quality bearings with copper run-on washers are used.

Due to the full boom, the pre-compression can be increased and the engine can run in a low-vibration manner. More price-performance for your maxiscooter does not go .

Crankshafts and connecting rods are forged!
The stub of the variomatic side is designed in one piece. No shearing in the shaft seal ring more like it often occurs with original waves.

Delivery including the piston pin bearing. It is best to order the right crankshaft bearing set at the same time.

Note:
The cheeks of the crankshaft have a diameter of 90mm and fit into all Piaggio Maxi-two-act housings, also with the small crankcase.

Please note : This shaft has a stroke of 54 mm, the original fitted has 52mm piston stroke. The multi-stroke of 1mm (1mm to "up" and 1mm to "down", a crankshaft rotation = 360 degrees) must be compensated accordingly. Either by means of a correspondingly strong foot seal (spacer) or a headspacer. Alternatively, a specially designed cylinder head (combustion chamber dome) can be installed. As a result of the compensation of the multiple stroke, the control angles of the cylinder naturally change. The inlet and outlet are opened longer. This results in a performance increase .

Since the angles due to the geometry of the crankshaft drive at the intake times tend to increase disproportionately to the control time of the exhaust duct, this must be milled accordingly, depending on the desired control angle, so that a suitable ratio exists again!