300ex Won't Run Right
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Sounds like you are having a jetting problem. If your plugs are black then u are getting to much gas and not enough air. Your jets might be clean but their might be something wrong with them or other problems like boring the motor 10 to 30 over with fatory jets instead of high performance ones or having a after market muffler with factory jets or even a high performance filter with factory jets. You have two main jets the needle jet and the bottom bowl jet. Try getting a Dyno Stage 1 jet kit follow instructions with the air mixture screw turned til it seals and then a one and a half turn counter clockwise and then see how it goes from there. If you have anymore problems just email me back.
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