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Fouled Plug Blues
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Posted by: Moose95---------------------
I've got a new KDX 200, ('01 left-over). I've just finished the break-in process for the engine. However, I'm fouling plugs left and right. I believe that I'm running the engine hot enough to burn the oil, but riding on tight terrain/thick woods...I may not be. I'm running the pre-mix 32:1 using Yama-Lube and a NGK BR8ES spark plug. My air filter is clean and lightly oiled, is there anything I'm missing here?
Posted by: ride_red_15---------------------
your air screw is probably in too far, and your jetted way too rich
Posted by: KiDX---------------------
The stock jetting is too rich, it's gonna have to be leaned out. Check out the JustKDX website for some jetting help.
Posted by: BRush---------------------
For the short term, use a BR7ES plug. This is a much better heat range for anyone who is riding woods/tight terrain. It will stay hotter and resist fouling better, It will not hurt your bike. This is my main plug.
Ultimately the underlying cause is jetting. Factory KDX jetting is notoriously rich. For some good starting points to rejet your bike, see the JustKdx web site:
http://justkdx.dirtrider.net/carbtuning.html
Once the jetting is right, a KDX almost never fouls a plug.
Posted by: MassKDX---------------------
I would suggest for starters go with a 155 Main and a 45/42 Pilot. I made this adjustment to my bike and it seems to be almost dead on. I could lean it out one more but I am happy with my KDX's performance.
Posted by: canyncarvr---------------------
'Just finished the break in..'? What did you do for the NEXT 10 minutes? 
When you get around to changing to a more reasonable ratio of premix (say 40:1), keep in mind that you are making it RICHER when you do that...so whatever problems you have now are going to get worse.
Note the hop-up section on justkdx. Under 'Is there anything I'm missing.' check out the airbox mod.
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