If you're going to be opening anything up, be it fuel line, top end, oiler, Anything beyond the filter...clean the saw. I have seen more issues, working behind other mechanics, related to contamination than any other single thing on saws. A clean saw runs cooler also. I take off the bar, clutch cover, top cover, air filter, recoil...muffler. Rotate the engine til the exhaust port is covered. Hose it all down with 50/50 purple power or simple green...let it soak while i fire up the power washer then i give it hell. Then i blow it all off with air, blow out the port, and assemble. Always fires right up...every saw. I don't have to worry about dirt getting sucked in or into the tanks, and its just good maintenance.
My saws stay nice and it looks good when a customer picks up a saw and it shines.
This MS-311 has been used commercially with a 25" bar all its life and the oiler, clutch, etc was smoked out. I did a teardown, clean, and new parts installed...and it looks great.
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