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Won't kick over and it's not the valves

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Alright I've got a problem. My bike is showing all of the signs of a valve clearance problem (or at least from what I've read it is). It'll bump start after much effort and when it does it runs erratically. It won't kick over at all. I've tweaked with my pilot air-fuel mixture screw and it appears to be at the right setting (just over 2 turns out). My carb was cleaned semi-recently as well. My spark plug is working. I tested to make sure it sparks. I really don't understand whats wrong at this point. Anyone have similar issues/know what is happening?

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The cam to valve clearances might be in spec but if the seats & valve faces are worn, they won't seal properly.

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