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If your talking about a 2 stroke motorcycle. i have the same problem, but you can prevent it from fouling by constantly rev the engine, riding motorcycles take tons of practice, i have a 125 yz when i first got it i fouled 3 spark plugs in 1 month. another thing you can do is change the oil, i run 1;44 and for 250 yz, my bro runs 1;50. Remember it takes practice also. i still don't have it down, i fouled one just a week ago. It happens when basically over use, not revving enough, oil is to rich.

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Q: What causes the spark plugs to be very dirty with oil?
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