fouling plugs

I have a 07 & 09 m8 that have fouled the plugs from day 1, the 09 being the worst. If I want sleds to perform decently I have to change plugs at 500 miles or less. In the beginning around 250 for the 09. My question has anybody else had this experience ? If so were u able to cure it, other than buying a new sled? I know a lot of people premix and I have considered doing this. The ? is has anyone gone to premixing and seen the life of plugs increase dramatically, to 1500 or even 1000. Or?

line8 said:

I had an 07, 08 and an ‘11. Kept all until about 2300 miles, except the 08 had about 1200 miles. Not one plug issue, didn’t even need to be pulled out to look.
No mods


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Were u using arctic oil or?

89sandman said:

Sleds bought new? Mods? Poor air/fuel ratio is usually the problem.

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I bought both sleds brand new. I put a slp intake boot on both, but I might add had problem before doing this. Only mod to 07. 09 is ported , Rkt head ,slp can and pipe with fuel controller. I've always thought it was just lousy fuel mapping. Put a new oil pump on and adjusted ratio to 40:1. Also installed a fuel pressure regulator. Checked to see if ecu and injectors matched. Maybe I'm to fussy. Where I really notice it is after reaching the bottom of a hill and getting back on the throttle it will be pretty blubbery until it clears out and it gets worse over time until I finally put in new plugs. Plugs are fairly inexpensive compared to lot of other parts. Well I guess it just bugs me. My stock 07 will hang right with stock 011 in a drag which really surprised me, but still goes thru plugs to often for my liking. Sounds like I got a couple of lemons. Some guys swear by a 50:1 ratio, but I'm skeptical of trying that, I'll just live with fouling plugs I suppose. OR go to legends zx2sr as an experiment if nothing else, seems to be the oil of choice by those in the know.