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Hello so I recently got a 07 raptor 700r it has no air box lid K&N intake fmf exhaust no spark arrestor it starts up no problem but when i blip the throttle kind of sounds like it misfires my spark plugs get really black and dry and i dont know if im getting to much air and not getting enough fuel so if i out the OEM airbox lid on will that help with the dry back spark plugs i dont have a fuel controller it idles kind of high. I dont know if im running rich or lean please let me know what i can do or if adding the air box lid will help
 

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I've learned over the last year of owning my 08 that I can't just start it up, rev it, then shut it off. It will foul plugs. Now, I start it and let it idle for a few minutes or until the coolant reaches 145+ degrees f before I start revving or riding it. Allow some time for it to warm up and let the sensors see everything is warmed up and fuel trims are adjusted .
 
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