[Jetting!!!????] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

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Jetting!!!????
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Posted by: graham300ex

I have to leave friday for a race and need to fix my jetting. I put a 400ex carb on my 300ex. It has 148 main. Idle to 3/4 is fine but when I get it wide open it stumbles and picks back up. Is it too rich? The spark plug i couldnt get an accurate reading.
Look at my engine mod list below.