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Fuel oil too rich. Jetted too rich. Run with choke on too long. Make sure choke is off after you put the new spark plug in it. (Choke it, start it, warm it up, take the choke off, ride it) If it fouls still, recheck that your fuel oil ratio is not too rich, then thirdly if another new plug still fouls then jetting will need to be changed. But beware, too lean and you will not be buying spark plugs but you will be buying pistons... If it fouls a plug every now and then, months, I wouldn't fret too much. If it's happening every weekend, figure it out. And, the colder the temp outside, the LEANER the air fuel mixture will be, I.E. rejetting will need to be done so again, be careful leaning things out too much too quick!
What else can I help you with?
How do you change sparkplugs in 2001 jetta?
pls give full info...2001 Jetta....what engine, etc?
How do you replace the spark plugs on a 2001 Deville?
TAKE OUT THE OLD SPARKPLUGS AND PUT IN NEW ONES
How many sparkplugs on a Mercedes Benz 2001 320 CLK?
Six plugs are fitted to this engine
Does your 2001 gt have sparkplugs?
Yes , it has ( 8 ) spark plugs and uses Fords Coil On Plug ( C.O.P. ) ignition system
If your horn won't work on your 2001 Chevrolet Cavalier What should you check first?
the fuse
Why does my 2001 Chrysler Town and Country 3.8 have no spark I changed the cam crank sensors new coil a new computer. Still no spark?
change your sparkplugs
Why won't the sunroof on my 2001 Subaru Forester open?
The first thing to do is check all your fuses.
What is the cause of the horn not working on a 2001 mirage?
I would check and see if it has a blowed fuse first.
What could be wrong if the windshield wipers on a 2001 Nissan Sentra quit working?
check wiper fuse first, then check wiper switch then check wiper motor
How do you fix the power door locks on a 2001 Honda cr-v?
Check the fuses first. Check the wiring near the door hinge.
Do you start from left side of the engine or the right side of the engine when changing sparkplugs on a 2001 Honda Civic lx?
Whichever side you like. The car doesn't care.
Tailgate lift does not open with remote 0n 2001 jeep cherakee?
Check the batteries in the remote first
