In Mororcycles, we are told to replace the sprockets ever time we replace the
chain ('cause it is the increased spacing of the sprockets (due to wear) that
has caused the chain to stretch).  Is the same not true for the oil pump
drive chain?  In the video, bruce measures the laxity of the chain (mine
measure the same his did) and replaces it, but no mntion is made of the
sprockets.

There is no visible wear.  Does anyone know if they need to be replaced?
Does the oil chan really need replacing?  Everything else in the engine is in
good shape, havent heard of many engine failures caused by chain failures...
but sure would hate for those to be 'famous last words'...

Dave Leonard

Sprockets on motorcyles are replaced because the wear changes the tooth
profile -" hooking" the chain does not "stretch" but the stacked up wear
at each link increases the loaded length. Lightly loaded oil bath roller
chains like timing chains generally have long life - Vance

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