Ok, I own a KFX 400 and I have removed the spark arrestor and the airbox lid. I am now running a K&N with outerwear.

Before I started re-jetting I was unable to run with the airbox lid removed (it bogged down way bad at half throttle on up) So, I learned how to re-jet and now have a few questions:

-Stock is 130, so i tried a 135 and a 138 jet. Still bogged down. So today I threw in a 165 after searching on this forum. Now it seems to run good with the lid off but i notice a little less top end... Anyways i put in a new plug and pulled it after 1/2 hour of riding. there was very minimal black (light black on top two threads.) However the gap thingy on top was kinda white! This scared me because I've never seen white before on a plug.

--Anyways, after this long novel I just really want everyones opinion on what they think. Should I jet differently or is the minmal white ok? Everyone respond!

 

155

 

I am a retired Small Engine Tech with over 20 yrs in Small Engine service and repair Industry with the last 6 yrs as a Factory Certified Tech in the lawn and garden Service , white on the plug mean is a sign of lean mixture ! ....................................

 

ok so if i'm lean then do i want to go even bigger to get more gas?

 

ok I'll answer my own questions. I went and bought a 175 main jet and switched out my 165. I just went for a half hour ride and now I just need to pull the plug to see how it looks.

Is anyone running a jet this freaking huge!?! 175 seems very large......

 

Does anybody know how to respond?? I must say this forum sucks compared to any others...

 

<div class="FTQUOTE"><begin quote>I must say this forum sucks compared to any others... </end quote></div>
Sounds like you need to go over to the less sucky forums to get your answer.

 

already did....thanks though

 

Hey guys sorry I was so rude about this....I was just stressed at fixing my four-wheeler fast because of an upcoming dune trip...really I appreciate all of your opinions and help. I hope I can return some help as well.

by the way, i'm now all the way up to a 175 jet! my plug is looking brown and i'm satisfied!