I used to have a lot of trouble keeping my chain saws running because the alchohol in fuel would keep destroying the pump diaphragms in the carbs, Since I began using this product that is no longer a problem. Also, a saw can be left for up to 2 years with old fuel in it and start immediately with this product. I feel this the best oil you can use in your 2 cycle motor.
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3/8 CLUTCH WT DRUM BEARING RIM FOR HUSQVARNA 61 66 162 266 268 272 XP CHAINSAW
It's a bit of work but you can repair your old clutch drum by buying one of these and first cutting off the old clutch rim saving the rest...then cutting free the new clutch rim to same size (tad smaller, maybe 0.15 inch) then attaching new rim to old sprocket by a good tig weld. Does not have to be continuous weld as spot welds 1/4" apart will hold well enough, will not overheat drum and probably work cooler, all in all.