zogger
Tree Freak
Hey Mark, that tiny 91 chain takes a 5/32" diameter file for sharpening. Sounds like you just need to clean out the gullets. You want 1/5 of the file diameter above the top plate for sharpening.
Ya it is 3/8ths lowpro. I matched up the rivets to known 3/8ths. Just the chain looked near new and the cutters were so teeny. Doesn't look like you can sharpen it too many times. I can see why Oregon went to vxl over just the vx, which is apparently what this is. Used it a bunch today, needs sharpening again though. I'm cutting branches that were dropped into soft dirt. I'll file the crap outta it, use it once more, then clean it, final sharpen, and put it away. Got more saws to finish and tryout anyway.