The SIP crankshafts:

• Crankshaft stub much more solid and stable than usual for the oldie engines.
• Oil seal can be changed from the outside, engine does not have to be "split".
• Material FKM / Viton (temperature and oil resistant)
• 60mm stroke / 115mm connecting rod

Performance version with high-end conrod

This brand-new range of SIP crankshafts are 100% 'Made in Italy' and easily fulfil all of the above listed requirements, especially concerning the high-end quality and well-conceived constructional features. Every single crankshaft is balanced to be compatible with the stroke, con rod length and model of scooter to which it is fitted. The 'Performance' crankshafts however have an extremely high-quality con rod included. The polish it receives upgrades the surface finish, providing it with a more stable molecular structure which makes the con rod tougher and more enduring. The smoother surface finish also helps reduce the turbulence in the motor, while simultaneously saving a lot of weight. They have a gas-flowed profile and have a revised big-end design, improving the lubrication of the bearing located there.

Mounting instructions:

• Chamfer the oil seal seat in the motor housing from the outside so that the oil seal does not peel off when inserted.
• If necessary, glue in place with the appropriate assembly adhesive.
• Press in the oil seal until the surface is flush with the outer surface of the housing.
• Compensate the missing plate of the original oil seal by using a shim washer, e.g. PS 50x62x0.5, between the bearing and the engine case.
• 3-engine studs VM - VL - VB require a 4 to 5 mm spacer at the cylinder base, depending on the design torque or speed.
• Vespa GS engines converted to Quattrini M1XL cylinders require a 15 mm spacer.
• Due to the large gudgeon pin bearing, cylinders with 16mm gudgeon pins can also be used on the Wideframe engine case.

Scope of delivery:

• 2 gudgeon pin bearings, for 15mm and for 16mm piston pin.
• Vespa GS wedge for ignition side
• Oil seal clutch side
• Washer for underlaying the clutch bearing

Conclusion: The better replacement for the original crankshaft.

Our recommendations – SIP-TIPP:

• Do not forget to change the crankshafts bearings and oil seals when replacing or servicing the crankshaft!
• These crankshaft tools # 27338000, # 21071000 and # 18119000 are also useful.