Crankshafts at SIP Scootershop - Overview
The Crankshaft is the centrepiece of an Engine. Briefly explained, the Crankshaft converts the movements of the Piston into the rotating drive impulse via the Conrod. This component is therefore subject to enormous forces, especially when tuning. If you drive constantly at 4,000 rpm for three hours on a country road, your Crankshaft will rotate 720,000 times! That's quite a few revolutions in a scooter's lifetime. So it makes no sense to save on the Crankshaft, but first you should limit the flood of Crankshafts by choosing the right vehicle category.
When searching for the right Crankshaft, you can first select the "Category" at the top, for example "Classic Vespa". You can then enter the exact "Vehicle type" in the field below and all the Crankshafts that come into question will be displayed.
The different crankshaft types
Standard crankshaft
Standard crankshafts are replicas of the originals. However, improvements have also been made to some models, e.g. a Gudgeon Pin Bearing for a lower frictional torque instead of a bronze bush or a polished forged connecting rod. The transition to Racing Crankshafts is sometimes fluid.
Racing crankshafts
By racing Crankshafts we basically mean all crankshafts that deviate from the pure standard specifications. So:
different crank web shape
more stroke
longer or higher quality Conrod
Clutch/pole wheel stub not intended for the original parts
optimised intake geometry through shape and cut-out
The range for the classic Vespa models is so large that we still offer them in Disc Valve and Diaphragm shafts diaphragm shafts.
Special racing crankshafts
Special crankshafts require special Crankcases. They do not fit into the original Crankcases.
Our top brands for Crankshafts
The manufacturers are represented to varying degrees depending on the vehicle class. Here are the most important ones:
MAZZUCCHELLI: Good and favourable standard and Racing Crankshaft. Made in Italy.
SIP SPARE PARTS: Special small series for Vespa classic cars and Lambretta models in top quality.
SIP PERFORMANCE: Developed by the brightest minds at SIP and produced in a high-tech tuning factory in Italy.
PIAGGIO: Large selection of Modern Vespa Standard Crankshafts.
MALOSSI: Top tuning Racing Crankshafts for Scooter, Maxiscooter and Modern Vespa. As MHR in the high-end version.
POLINI: Back to the roots! Active again in the crankshaft market for Vespas for some years now.
PINASCO: Beautiful Shafts for classic Vespas.
Customers ask - SIP answers
"Can I change my Crankshaft myself?"
Of course. It's not very complicated. If you're unsure, take a look at the Hand Book or watch our tutorial videos. Once you've got to the Crankshaft, keep this in mind:
Do not hit the Crankshaft with a Hammer or knock it out (hardwood or special tool)
When changing the bearings, heat the Crankcase well (hair dryer)
Do not fold over the sealing lip of the Oil Seals during installation and pay attention to the installation direction
Fasten the Flywheel with the correct torque
Gudgeon Pin Clip must sit securely in the groove
Good luck!
