Bearings and crankshaft seals Motobecan 51 Polini

Bearings and seals Polini for Motobecan 51.

This Polini crankshaft bearing and seal kit is designed for maintenance or rebuilding of the engine crankcase on Motobecane 51 mopeds. Developed to replace worn original components, it renews the crankshaft supports and restores proper sealing in the crankcase area.

Replacement of the bearings and seals is recommended during a complete engine rebuild or when symptoms such as play in the crankshaft, abnormal metallic noises, or possible air leaks caused by worn seals are detected. A loss of sealing in this area may affect carburetion and the overall operation of the engine.

The kit includes bearings with C3 internal clearance tolerance and a riveted steel cage, suitable for use in moped engines subjected to high rotational speeds. The seals made of PTFE and FKM offer good resistance to fuels, oils, and demanding operating temperatures, helping to maintain the sealing of the assembly.

Technical specifications

• Manufacturer reference: 282.0010
• Product type: crankshaft bearing and seal kit
• Bearings: 2 units of 16x42x13 mm
• Bearing tolerance: C3
• Cage: riveted steel
• Seals: 2 units of 15x22x5 mm
• Seal material: PTFE and FKM, also known as Viton

Compatible models

MOTOBECANE

• 51