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View Full Version : 400ex jetting



jelrod05
05-02-2010, 07:34 PM
i have a stage two cam, 10-1 compression piston, uni air filter, two brothers slip on,rev box and i am running a 142 dynojet main jet,42 pilot, dynojet needle on middle clip, and pilot screw 3 screws out.

does this sound about right

bkelley
05-02-2010, 07:42 PM
Might be a tad lean with those mods. Should be pretty close, though. What does your plug look like?

jelrod05
05-02-2010, 07:49 PM
what would u reccommend

bkelley
05-02-2010, 07:55 PM
Well I can't really recommend anything without knowing how it's running or what the plug looks like. Like I said, you're probably pretty close with the 142 DJ and three turns on the f/a.

jelrod05
05-04-2010, 03:59 PM
my is black around the base and looks like the electrode is dark gray color.

JOHNDOE83
05-04-2010, 04:28 PM
Try the FAQ's section at www.jetsrus.com How to read plug's.