Chainsaw Repair

I also put the .325 sprocket & 16" bar and chain on it and went out to the log, I noted a lack of performance & some smoke & heat from behind the clutch cover, I took the cover off & found the clutch drum & brake band were somewhat blued but no evidence that the brake was on. I put it back together,made sure chain was turning freely and brake was off, went to the log and got the same result, smoke & heat.
  The brake was not on and chain turned freely, took it apart again, more blue on drum & band.
 I put the 3/8 & .325 drums side by side and could see the .325 drum is much thinner metal.
 My conclusion is the clutch shoes are pushing hard enough on the drum rim to expand it out to the brake band.

  John