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Discussion Starter #1
I have a 98 mxz 500 rotary valve which i fired up today, let it warm up for 15 mins -15 c but just when i got back to the ski-doo it began to idle down from 3000rpm to 2500, 2000, 1800 and then it quiet in which took roughly 2 minnutes. I checked the heat exchangers still cool, spark, compression, fuel and everything checked out, but when i took the spark plugs out i noticed that their were fumes comeing out of the holes, which i think was exhaust. could my exhaust valves cause this? if so what should i use to clean them with? wd-40? Any comment would be greatly apreceated.Thanks
 

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journeyman sled/motorhead
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4,440 Posts
sounds like it loaded up and fouled the plugs.
 
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