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Old 05-21-2007 | 03:53 PM
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Motorboy
 
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From: Bergen, NORWAY
Default RE: Replacing piston ring?

ORIGINAL: Jim Thomerson

Some two strokes are pinned; but some, K&B 4011, for example, are not.
The pin are necessary if the ports in sleeve are large to prevent the end of ring are coming out of port and jamming the piston. The sleeve with many small ports are pinned ring uneccesary.

See my homemade piston with ring and sleeve in the OS 61 engine in these photo.

Jens Eirik
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