Posted June 09, 2004 - 06:45 AM
I had the same problem for a long time and would foul plugs non-stop. I read all the posts about air filters etc. They all had some positive effect, but non like what I finally did last. I took a few hours aside from riding to remove the carb to do a complete cleaning. If you've never done this, read a few posts about it and you'll be a master. I put it all back togther with the stock settings and jettings. Then I implemented a storage procedure I came accross on an old post a long time ago. It is as follows. When I come off the track or finish trail riding, I turn the gas off on my way back to the pits. I take a few turns in the pits and goose it a few times to get the gas burned out. If it is still running, I just let it idle there until it stalls. Then I push on the kick starter until it wont move anymore. It is the point where on my 01 426 you'd have to hit the decompression lever. What this does I guess is keeps it at top dead center and prevents fuel from migrating into the engine compartment. I swear on my mother's life, I did this a year and a half ago and have not changed a plug since. I was so frustrated because I would have to change a plug before every ride.
I hope this helps, but one negative result of this fix is - I don't clean my air filter after every ride like I used to. Shame!!!! - Shame!!!!