Spark plug choice...

[250motoxer]

I recently got a 2004 KX250. I have not ridden it very much yet, still on it's first tank of gas. Yesterday I took it out continuing to break it in nice and easy... After about 20 minutes it fouled the original plug... I figured no big deal. I put in a new plug and away i went. About another 20 minutes of riding and it fouls the plug again. Only carried one spare. :eek:
The original was an NGK BR8EIS {or IES not sure} the second plug I used was a BR9ES. Do I need to run a Resistor type plug in this bike?
My other thought was to drain the rest of the gas out and put my own mix in. Any other thoughts?

 

[BlazinBoy]

Yes definately change your fuel. Be sure to run a resistor plug and make sure you use the correct heat range (BR8ES). Was the stock plug a BR8ES or a BR8EVX?

 

[dustinabax]

Yea you might want to try draing the fuel and puting in your own mixture whatever you do dont use splitfire plugs I would stick with NGK also if you were just taking it easy while you were riding and not geting on the gas any that could have caused it I have had that happen to me a few times

 

[Jeff Gilbert]

It's broken in now so put in fresh fuel, a new plug and ride the heck out of it. :aj:

 

[YamaB]

I switched to the BR8ES plugs after my yz250 started plug fouling... They work just as well and only cost like $1.50 at the auto parts store (get mine at Oreilly's)...

- BA