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I am rebuilding a Quest 650 from scratch. The back end literally burnt out. First, I'm trying to figure out what carburetor to buy. I could just buy a stock one, but I want to try a bit bigger one. There is a formula to calculate CFM of that carb but I need the max rpm the engine can output. Anyone have an answer to that?

Also I have to tear the cylinder head apart but cant find the valve spacing anywhere. Anyone know where I could get that info - all the online shop manuals seem kinda sketchy and I don't wanna spend 50$ for this one piece of info if I dont have to.
 
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