Jetting 400ex w/alien system and k&n air filter
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#2
Jetting 400ex w/alien system and k&n air filter
its hard to keep the same feeling as when it was stock...........
stock, all the power is a the high rpm range.........
now with the pipe and filter your power has probably moved to low end and mid range.
making it feel not quite right at high rpms,,,,,
have you re-jetted at all??????????
stock, all the power is a the high rpm range.........
now with the pipe and filter your power has probably moved to low end and mid range.
making it feel not quite right at high rpms,,,,,
have you re-jetted at all??????????
#4
Jetting 400ex w/alien system and k&n air filter
AT FIRST, I HAD THE SAME SET UP. I TRIED 152, 160, 162, 165, 168, 172 MAIN JET. THE 168 MAIN WORKED BEST FOR ME AND IT STILL WORKS BEST WITH MY 440 MOTOR. I RACE MX IN SOUTHERN CALIFORNIA. WHERE YOU LIVE OR RIDE MIGHT PLAY A BIG FACTOR ON THE SIZE OF YOUR JET. DIFFERENT ELEVATIONS, DIFFERENT JETS.
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#6
Jetting 400ex w/alien system and k&n air filter
Did you move the clip on the needle? If you didn't you need to move it one down(so the needle is coming up sooner). Did you mess with the pilot screw at all? This is my setup 158 main, stock pilot, needle moved one down( I always get the up and down terminology mixed up). But I have no lid on the airbox(big difference). Run yours with no lid and see if it is better, worse, or the same. Better means your to rich. Worse means to lean. Same means ??? Also when I added my DMC I seemed to lose some bottom end. Also try this question on Exriders.com and you will get a ton of responses better than mine.
#7
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#9
Jetting 400ex w/alien system and k&n air filter
Hey crabbybob (havinnoj). Leave your air screw and pilot the same. Just change your main from 155 to 162 or 165 or even 168. See which works best for you. 168 means less bottom more top, 162 means so-so bottom more mid and less top. 155 means you are starving you motor of fuel. I think 162 should work perfect for you.
#10
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