Methonal powered Gx200 question

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marcus254

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New member long time lurker, I have a question on a build I've been working on.

So I have a gx200 I have rebuilt, I'm only able to reach 5500rpm, trying to figure out whats holding the engine back.

I have a bored .670 methanol carb from NR racing fed by a pulse pump, 8º timing key, .010 Billet piston, 22lb valve springs, stock cam, this is on a 90's model Emmick kart. Valve lash is set at .003. Set idle at 2000rpm, idles smooth.

The kart runs strong, not hearing any valve float, just wont climb any higher. Is stock cam not allowing for the higher rpm? It should still climb to 6000 with the stock cam shouldn't it?
 

Flyinhillbilly

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Is your insulator bored to match your carb bore? Methanol likes a lot of ignition timing, and your jetting could be off. Methanol is pretty forgiving of a rich mixture, so you may try going up a little on the main jet to start with.
 
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