2000 ZX-12R K&N Filters
 

I recently put K&N filters on my ZX-12R and I have a full Muzzy system on my bike. Since I put them on my bike is running very "rich" and keeps filing out my plugs. The bike ran fine before I put the aftermarket filters on. What could be causing this? Do I need a power commander or does anyone have any suggestions or reasons? Any help would be great thanks.

If you had carbs, I could help. K&N's let more air into the mix. You'll need to tweek the air-fuel combo. Did you install the pods or a replacement "plate" type filter in the OE airbox? Either way, it's a mixture issue.
BTW, welcome to the forums. One of the EFI-savvy guys can help.
Gear up; stay safe.

fouling the plugs with a K&N and with a full exhaust and nothing else was messed with? Sounds like you had better get some tuning done on this FI for your combination. Good luck and welcome to KF.

Thanks for the response.

+1 on Drags comment...Power Commander III...