This could be a problem with chain sharpening technique. Use of the correct size file, filing angles, and filing depth will all affect cutting performance. If the bar and chain are worn, you may be experiencing chain 'roll-over' which hinders the way the teeth cut into the wood. Try turning the bar over and tighten the chain a little more than usual, but still be able to turn it by hand. If the outer edges of the bar groove area have a 'flared-out surface, take a file to those edges (cut about 45 degrees) which may be catching on the 'kerf' of the cut. Make sure the teeth are cutting toward you on the bottom run. Hope this helps!
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This could be a problem with chain sharpening technique. Use of the correct size file, filing angles, and filing depth will all affect cutting performance. If the bar and chain are worn, you may be experiencing chain 'roll-over' which hinders the way the teeth cut into the wood. Try turning the bar over and tighten the chain a little more than usual, but still be able to turn it by hand. If the outer edges of the bar groove area have a 'flared-out surface, take a file to those edges (cut about 45 degrees) which may be catching on the 'kerf' of the cut. Make sure the teeth are cutting toward you on the bottom run. Hope this helps!