Jetting/ exhaust help

[unitednations]

How do you exactly read a spark plug to see how its running? I have a full hmf exhaust and a k&N air filter no cover, 11:1 compression. And a stage 2 hot cam. It started to backfire on decel. It ran fine for a year. I have a 40 slow and 168 main jet in it. A 42 was way to rich.


And also how exactly do you put the headers on right so they do not leak?, i cant seem to line them up right. or keep the crush gaskets from moving.

thank you

[JOHNDOE83]

go to www.jetsrus.com and look for the FAQs part on how to read plugs.

[unitednations]

ok i did that but one question yet, is the insulator sposta stay white or change? the tip is tan and the insulator is still white.

[unitednations]

bump

[mineralgrey01gt]

your good to go man, after time the insulator will turn the color of the plug but if the tip is brown now, your good