UMS 7-90cc CAM PIN GUIDE ASSLY ( X 2 QTY / PACK)

This is the cam pin guide assly for the UMS 7-90cc engine, the seven-cylinder 90cc four-stroke radial from UMS.

The part itself is the cam pin guide assembly, which locates the cam follower in the crankcase.

Why it is replaced: a worn guide lets the follower move out of line, which shows up as uneven valve timing and noise. Supplied as a pack of 2, which is how these small parts are normally bought — you rarely need just one.

Fitting note: Check the follower for scoring when renewing the guide.