2008 YZ 250 2-Stroke Fouling plugs

[batfink0]

Here is how it goes.
I Put a new plug in, and ride all day long with no problems. The next day, I try to start my bike, and it runs for about 7 seconds, and dies instantly as if the spark plug wire were pulled. I ratchet off the spark plug, and find it to be completely black, sooty and wet. I can't even clean the plug and make it work, but if I put in a new plug, it starts first kick and runs all day.
Of course, this brings us back to the start of this message.

Why the hell is my bike fouling like this?
I mix my fuel/oil 40:1, so it's definetly NOT a fuel/Oil mixture problem.

Anyone???

 

[gr8tdragon]

My freind had an ATC 250r that did this. The solution to this is to buy a platinum plug. It deals with your ignition system. Burns out the plug. Platinum plug will tolerate this better.

 

[talkinghamster]

my 08 YZ85 did the same thing, i bought a platinum plug and some amsoil synthetic oil, runs good now!

 

[Wylie262]

my cr used to do that and all i had to do was make sure to turn the fuel off after every ride. havent had the problem since.

 

[Slamnek]

Amsoil Dominator and a 50:1 mix. I run that in my CR all the time and never foul a plug.