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How to adjust the Valves on a GY6 engine "A LOT OF PEOPLE DO NOT REALIZE THEY ARE NOT ON T.D.C. AND HAVE THE FLYWHEEL ON THE T INSTEAD OF THE 2nd LINE!" The correct mark on the Flywheel is You will see F and (T) Look under the letter (T) there should be 2 marks The second mark is T.D.C. not the (T). Line that 2nd Line up with the piece of casted thin metal you cannot miss it, Then look at the Cam shaft it should have 3 Holes "The 2 small holes should be lined up perfectly with the cylinder head mating surface of where the valve cover seals to the cylinder head" & "The one big hole on the Cam Shaft Sprocket should be pointing up at a 45 Dagree angle when you look at it while the other 2 are perfectly lined up with the Valve Cover & Head mating Surface" Best Setting for GY6150 vales is 0.03 intake and 0.05 Exhaust.

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