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After some ideas, just picked up a quad master 500. In neutral is revs up fine. Under load when cold it misfires. After about 10 minutes of riding it’s fine and revs freely.

New plug
Cleaned air filter
Checked fuel valve and filter
Stripped and cleaned carby
 

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Compression? Might be the compression is a bit low. Could be the piston expands as it heats up, so it would get better as it got hotter.

Or it could be a seal/gasket leak that goes away once it heat up.

test compression when cold and hot and see if there is a difference. Compression could be as low as 90 psi and still run. Typical 4 stroke compression should be above 130 psi.
 
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