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View Full Version : 400ex jet question? Please help



kolby2004
10-29-2007, 06:09 PM
My sig pretty much sums up all my mods. I bought my 400ex about one year ago and never opened the carb untill now to do a quick cleaning and found out that my jets are 45 pilot jet and 155 main. I am having some issues. I notice the problem the most when doing a wheelie in 1st gear and once I get the front end up and just blip the throttle it seems to just cut out and the front goes back down. Or anytime I let off the throttle and then get back on it real fast it seems to cut out. I am guessing the pilot jet is too big. What should I go down to? I have a 42. Should I try that one? It seems to run good other than that. 155 seems small on the main but seems to run good. should i try anything different on the main too? Thanks

AJG400
10-29-2007, 07:55 PM
i had a 45 in my 440 to start with and i went to a 42 with the pilot screw out 2 turns it was a lil rich so u could try that but u might have to adjust ur pilot screw and i also had a 165 main in mine which seemed fine but i run 110 oct gas also