Hey guys, new here!
I am hoping some of you could take at look at 2 of my 4 plugs for me please. I have read a lot on here and still can't come to a conclusion.
These plugs are out of my snowmobile, which is a 4 stroke engine, basically the same engine as the Yamaha R1 (1000cc) superbike.
I have the ability to tune EACH cylinder separately. I can add or take away fuel and timing for every 250rpms and at 0%, 2, 5, 10, 20, 40, 60, 80, and 100% throttle positions.
I took out my plugs in favour a new set last Sunday. ONE was leaner looking than the other 3, so a pic of the lean one and one of the other 3!!
YES, I do have a 90hp nitrous shot on this motor, that I was using earlier in the day, but there is at least 1 more hour on those plugs since I sprayed any nitrous.
With the nitrous I run -2 deg timing on the map. When I was spraying it this last time, (for other reasons, nitrous leaking from airbox) the A/F ratio on my WIDEBAND was 9.50's. Normally I run the nitrous at 11 to 1.
On the motor, which saw LOTS of WOT in the last hour prior to taking out the plugs, I see 11.70's A/F at WOT and mid 12's at cruise.
Sorry for the long background post, but I feel there are people here (from reading) that really know what they are looking at!
Thanks
EDIT : the dings on the ground straps must be from handling the plugs on my desk at work, etc...
![Image](http://img146.imageshack.us/img146/4973/plugs3ma8.jpg)