jetting after motor work

[upnorthridered]

i put a 12.1 piston, stage two cam, full moto works exhaust system and a k and n filter and lid on a 400 ex the main jet was a 148 i am up to 180 and still the plug doesnt have any color has any one done this build and can help with the jetting?

[atvrider13]

180 sounds close . How long have you ran it? Because if you dont run it for very long it wont have much for color. If you mean its white from being too lean then definetly go up on the main.

[cheater13]

How's it running?

Any backfiring or sputtering throughout the rpms?

[upnorthridered]

it runs pretty good no backfiring, no sputtering i just was wondering if any one had done a similar build cause i have gone from a 148 to 180 main and the spark plug is still white and i am doing some runs down the road to test the plug