dont know the age of your m/c but corrosion on spin tube will cause a slow spin on these, expensive repair as outer tube will be corroded as well. as dave said these are a very easy stripdown .had one that had not been used for a while and after stripdown and a bit of freeing of clutch and brake m/c kicked back into life and ran fine(cap is 22 if memory serves me right but check it out before you put one in)paul