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Hi I have a 2002 400ex (specs below)

Re-built professionally top and bottom beginning of last summer, like new oem transmission installed as well.
416 11:1 wiseco piston.
Ported rebuilt head bought from je Honda.
Full ct racing exhaust
Stage 2 hot cam

So I bought this 4 wheeler off the guy he said it didn’t start so I brought it home and put it on a charger and it started up. But the problem is when you ride it cold it runs amazing doesn’t bog at all but the second the 4 wheeler starts to get warm it starts to bog out and eventually stalls. Lots of back firing happens too. So far I’ve changed the spark plug and put a new OEM ignition coil and CDI in. I’m no mechanic by no means any help would be appreciated
 
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