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I just picked up a 2000 600 RMK with only 350 miles on it. It runs great with a small problem after it has been shut down over night. It floods or fouls the plugs easily. When I first attempt to start it the plugs seem to be fouled. I take them out & clean them up and the machine fires right up. I run 88 or 90 octane fuel. Does anyone have any ideas or is it just the trashy fuel in this neighborhood. Fuel is a concern for this area.
 

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I would check your floats and make sure your your needle is seating good to shut the fuel off. I had the same problem on my 03 xc sp, and found out i was running rich. I dropped 2 sizes on my main jets and it runs like a top now.
 
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