OK, my brother was riding my 2005 KFX 400 over the weekend and now it wont run.
It starts up just fine, but once warmed up it stalls. The coolant is also really low, I just noticed so I will add some tomorrow. I know it wasn't low before last weekend.
It has a pretty new sparkplug and fresh gas. He swears he didn't ride it that hard or roll it.
I dont want to check the sparkplug because I have to take the gas tank off, I will if I have to.