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fouling plugs
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Posted by: EXrobash

My 400ex won't start when it is real cold. The plug turns black, but is wet. I can take it out and brush it, and it fires right up, but with a lot of backfiring. Do I need to go to a bigger main? If I don't take the plug out, it won't start and I kil the battery.

Posted by: Colby@C&DRacing

is the sparkplug oil fouled? have you noticed it burning oil? Have you tried a new plug instead of cleaning the old one? Is your airfilter clean. This could be many possibilities, are you using the choke? check your pilot jet and try a new plug.

Posted by: Rico

Are you using your choke????

When I had a choke in my carb everytime I used the POS i fouled plugs.

Posted by: 400ex28

quote:
Originally posted by Rico
Are you using your choke????

When I had a choke in my carb everytime I used the POS i fouled plugs.

rico, i did the same thing lol

Posted by: blue450yo

my 400ex fould plugs every winter so far.