Hello everyone and thanks in advance, new to the forum and Im needing some help, that being said let me explain

I have a 1991 trx250x has a fresh 330 kit on it which makes it a 280cc has a ported and polished head, new kibble white valves, has a 400ex carb with a 40 pilot and 160 main running an open air filter (K&N) with pre cleaner, it eats nothing less than 110 octane fuel, it is a kick start machine with a cable decompression, valves are set at 0.04 timing is spot on has a new ricks motorsports over rev cdi, I ohmend the coil and wire and cap and they are with in specs, so my question is what else could possibly be wrong with this quad.

I have built this motor and not even been able to hear it run so I am reaching out for more like minded opinions

thanks and I look forward to reading responses