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Hi I just rejetted my bike today with the dynojet kit. I have an 02 400ex with a 440 big bore kit, big gun full exhaust, and moose air filter with no lid. I used a size 42 pilot jet and 170 main jet which is the size that the kit recommended. I also changed the needle to the one that came with the kit. I live in Staten Island , ny so I am not high above sea level. The air/fuel mix screw is turned 3 times out. The problem is that when I rev it high the motor cuts out and stalls. Also it runs best when the choke is at half way. Any ideas on how to properly adjust this to get it running right ?
 
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