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Discussion Starter #1
my old mans got a 01mxz 600 trail.  it likes to foul the mag side plug, after it sits and idles or if you hold the same throtle possition for awhile the pto side plug is very good color,the mag is damp and dark indicating a rich condition  temp doesnt seem to make a differnce. the carbs are clean and ajusted acording to skidoo stock 500 mains any ideas.
 

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I have the same problem w/ fouling a plug at start up. never fouls a plug when warmed up.
 

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The 1st thing I always check when a customer has a problem with frequently fouling plugs is the exhaust side of the pistons.Pull off the Y-pipe and peek at the pistons. Frequent plug fouling can be an early symptom of piston scoring/failure. Later      RB
 
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