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400exc
03-27-2005, 08:06 AM
What is the main jet for the 400ex, when it is completely stock? My friend wants to know, and I told him i would find out. Does anyone know if I am running a K&N air filter, if i have to jet it?
nosliw
03-27-2005, 10:16 AM
148 keihin hexhead main
yes
04'400ex'er
03-27-2005, 08:46 PM
you dont have to but you will run lean if you dont. Id do a 150 with lid and a 152/155 without lid.
400exc
03-28-2005, 10:11 AM
well, i checked the plug, and it dont seem like it is runnin lean, it is like a regualr color, and what the color should be on a regualr spark plug.
2000400EX
03-28-2005, 10:33 AM
http://www.atvriders.com/articles/sparkplug.html
cals400ex
03-28-2005, 11:30 AM
Originally posted by 400exc
well, i checked the plug, and it dont seem like it is runnin lean, it is like a regualr color, and what the color should be on a regualr spark plug.


how do you know it is a regular color if you don't know what a regular color is? i prefer mine to be a tan color.