• Why would my spark plugs keep fowling out on my 2011 rancher 420 It never did...

    Why would my spark plugs keep fowling out on my 2011 rancher 420. It never did it until I put my aftermarket exhaust on it

    7 comments
    • You need an optimizer

    • Would a hotter spark plug help until I get One?

    • Need an optimizer

    • What does the plug look like (color it's burning)?

    • Black

    • Optimizer with dyno tune. Or a injector

    • Because it's running lean and trying to melt a hole in your piston.