Thanks I'll check the front sprocket but it spins freely when I use high pressure air when I clean out the slot on the bar. In fact it spins so fast it sounds like a serine. I replaced the bar on the 261 not long ago and it matched up exactly to the old one. I put a new drive sprocket new bar and new chain with the same results. In the past the adjustment would last until I had no teeth left on the chain. Now I'm running out of adjustment long before I wear down the teeth. Something has changed.
Spinning bearings fast with air is a good way to destroy them.