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I usually get about a year of daily riding out of a GY6 50 (QMB139).
By that time they are totally worn out except for the gear box. The big BUT is the parts are cheap, and I can rebuild the entire engine in about three hours.
That's based on about 1,500 miles of 300 ish days a year. Three hours is based on roll in to ride out.
I should add that I don't stop riding because of strange noises or oil depletion. If it seizes I wait for it to cool, and add a few ounces. If the rollers are down to the cores... I got my 9 bucks worth out of them.
My current ride is torn down waiting on a trany seal kit, crankshaft, 50mm cylinder kit, variator kit, and starter motor.
That's the result of my daily "Who gives a crap" regime. BUT (again) I have about 13-14 months on that, and the total bill for parts is under 120.00 bucks.
Just my 2 cents on QMB139's
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