Had an unusual one with my 346xp today. Last week my bar nose sprocket gave up the fight. I replaced the bar, but for the next couple of days the chain wouldn't run smoothly, it would snag when manually pulling the chain around the bar and the saw was finding it hard going and running very hot.
I checked the chain, bar and drive sproket, everything seemed fine but when the saw was assembled it would start to snag again.
It was not until I had a really close look at the drive sprocket that I noticed one of the bearings from the disintegrated nose sprocket had ended up perfectly wedged into the middle of one of the recesses of the drive sprocket. This raised the chain slightly, once each revolution, throwing it out of line and causing it to snag as it entered the bar.
The bearing was a right bugger to get out. The chain must have carried it to the drive sprocket and deposited it with micro-millimetre precision.
Anyone else had this happen?