what is the stock jet of a kfx 400?

 

I would think that would depend on where you bought the bike. The correct jetting would depend on altitude. I'm not sure if the dealer adjusts the jetting or not. My spark plug looked like a perfect brown the first time I pulled it a month or so after I bought it.

I thought I had written down the stock jet size when I installed the pipe and rejetted but if I did I can't find it now. I want to say it was around 130 but that's nothing more than a guess at this point.

 

i live in minnesota and i was wondering because i have a 2 brothers pipe i just got that came with a 146 jet, and thats to run with the pipe and airbox lid off. but i was planning on leaving the airbox lid on because i go mudding so i was wondering if the stock jet was only 1 or 2 sizes off i could leave the stock jet in and be good