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Rust on the piston head? Respected engineers Please help!?
Recently I spent a lot of money in the reconstruction of sports bike engine 150cc gasoline my showroom in the service center to obtain and use all the original components. The bike is running all fine, but not getting much power. The engine vibrated above 4000rpm. But recently, when I opened the plug to check if mixture is too lean, I looked around the spark plug hole with a white LED flashlight and found the piston head is yellow (color of gasoline) with lots of red-brown scars on the piston head. Are rust or something else? Am I wrong? I am given an old piston? They took nearly 9000 rupees to rebuild the engine with new piston, cylinder, cylinder head gasket and crankshaft. Also kindly tell me which way (clockwise or counterclockwise) should I turn the screw carburetor fuel at constant volume (CCV) to make the air-fuel mixture richer in fuel? Are there problems with the engine if I am Start the engine with a rich mixture of fuel? Please advise.
This is mostly guess what the problems might be. The piston is of an aluminum alloy, so it would not rust. It may be the source of your vibration due to a difference weight of the original. I really sounds like you have a problem with the fuel quality and it would be better to obtain or renew a fuel filter (Thinking this is the source of the piston and color spots). And finally, I believe that turning the screw counterclockwise will make the fuel mixture richer. As far as quality of work you got for your money, I can not give an opinion, sorry.
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