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Yamaha rebuilding raptor 660 motor

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I have the motor apart on my bench, have the head and camshaft off. Looking at the piston and it seems like there is a large gap between the piston and the cylinder, I can stick my fingernail in between the two, when the other side of the piston is flush with the cylinder wall, is that normal? I will be measuring it later.

I bought a new piston and rings for it since it was burning oil, but the valves have also not been touched for a year, if the valves were off could it burn oil? About half a quart a week, as well as smoking on startup.

Should there be oil around the valves and camshaft? Or are my seals out? This is my first time taking apart this motor.

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you probably have too much of a gap between your sleeve and piston

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Yes, there should be oil around the cam and valves. The valve guides need to be replaced that is why it smokes on start up.

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