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I have posted this before but was hoping to maybe get some fresh ideas on an old problem. I have a 2007 Honda trx 400 fga. I had to get the head rebuilt. Since I put it back together it won't idle. I'll get it to idle in neutral put it in gear it dies. Get it running put it in gear get it to idle run to the store for gas as soon as I stop it dies or get it to idle in gear put it in neutral and It idle really high. Get it to idle in neutral and hit the gas it idles really high readjust and it dies. I cleaned the carb really good (it wasn't very dirty in the first place), then replaced the carb with a Chinese knock off, bought a rebuild kit and rebuilt the original carb and through all that it has ran the exact same. I can't figure out what the problem is. Please help! Any advice would be appreciated. Thanks in advance
 

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Have you adjusted the valves? Improper valve lash will have various symptoms. Not necessarily what you are describing, but if you fell confident on your carb rebuild then valve lash is where I would turn next. Also make sure you don't have your main jet and slow jet crossed up. Pilot screw should be 2 1/4 turns out.
 

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Have you considered a vacuum leak at the carb manifold? That it idles high leads me to think this is a contributing problem.

Rick
 
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