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Serious Thumper 2005 No Login
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Professional "scooter trash".
Posts: 5207
Rosemark TN
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Flush your engine out. If it sat around with old oil in it, especially who knows how old and how dirty old oil, there are deposits stuck to the gears, bearings, bushings, shafts, case itself...
Drain the engine. Put the plug back in the lower case, remove the exhaust pipe and insert a test plug (rubber and steel thing from the hardware store). Pop a valve adjustment cover off, fill the engine with diesel fuel, put the valve cover back on. Let it sit a week or two, drain and refill with diesel. Let it sit another week. Drain it out, put in 2 liters of diesel, remove the plug wire, and roll the bike around, occasionally trying to "pop" start it. The diesel and the sudden lurch will break loose any remaining deposits. Drain the engine, open anything you can to the atmosphere, and let it dry out. When it stops stinking, button it up, add fresh oil, and go for a short ride, planning to replace the oil within a few kilometers.
Then change your clutch plates, refill with fresh oil, and see how it does. Diesel is an amazing cleaner, and has enough lubricity to not frag the transmission guts, piston rings or valves. It will dissolve gum, carbon deposits and glaze... but it will eat your clutch discs if left in for too long.
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