I am running a white bro's exhaust with a fmf head pipe and the white brothers air filter! I have messed around with the jetting for weeks and I can't figure it out. I bought a Dino Jet kit and when I set it up the way they tell me too it runs good for about 5 min the when I go to give it more gas the engine starts cutting out until I let off the gas, it doesn't always do this? I am under the 3000ft thing. Please Help!!!

 

Your float may be set too low if the quad runs fine for a while and then starts acting up. If the float is set too low, your carb bowl could be running dry after a few minutes of heavy throttle and letting off just gives it a chance to fill back up. Easy to check the fuel level in the carb by attaching a clear hose to the overflow fitting, holding the loose end of the clear hose higher than the carb but right beside it, and opening the bowl drain screw. If the fuel level in the clear hose isn't at or just below the carb mating surface, your float needs attention. Hope this helps!

 

I had a Dynojet on my 400ex, and found that the recommendations were too rich. Back of the main 2 sizes. The air screw was ok though.

Glamis