A set of ball bearings with special SKF TN9 polymer cage crankshaft bearing in C4 quality and all gearbox bearings in CN quality including all necessary FKM shaft seals. A complete set of bearings for engine overhaul suitable for Simson moped S51, S53, S70, S83, KR51/2, SR50, SR80 with M500, M700 engine.

Ball bearings with polymer cage are used in racing for high-speed 2-stroke engines. SKF specifies here the speed resistance up to 20,000rpm! The advantage: elastic polymer cage with less friction!

Important! Note the installation direction of the crankshaft bearings: the half-open cage must be installed in the direction of the crankshaft cheeks!

Included in delivery:

2x SKF bearing 6204 C4

1x bearing 6004 CN

1x bearing 16004 CN

1x bearing 6203 CN

1x bearing 6000 CN

1x Oil seal FKM Premium 20x47x7mm

1x oil seal FKM Premium 20x35x7mm

1x oil seal FKM Premium 22x35x7mm

1x Oil Seal FKM Premium 20x30x7mm

The ball bearings in this set have the following characteristics:

Seal: open

Bearing clearance crankshaft: C4

Bearing air gearbox: CN

Ring material: rolling bearing steel

Rolling element material: rolling bearing steel

Cage material crankshaft bearing: TN9 polymer cage

Gearbox bearing cage material: sheet steel

Difference between FPM, FKM, Viton®:
Behind the abbreviations or names mentioned is the identical basic material fluororubber. FKM is the short form for fluoroelastomers according to the American standard ASTM. Whereas Viton® is a trademark of the company DuPont Performance Elastomers.

In our range, all fluororubber products are designated with the abbreviation FKM.