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advancing or retarding the cam are techniques used by engine builders to fine tune the valve timing. Also, many times the cam is not ground right where it should be so you have to advance or retard it just to get it where it should be. Degree it with the chain, repeat with the gearsetup, make sure they are the same.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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