Sluggish Low-end

[Ukel]

I recently bought a 2002 400ex and i've began to notice that my lowend in 2nd and 3rd is pretty bad...I guess i'm not really sure what i'm suppose to be expecting, but sometimes when i'm coming outa a turn and punch the throttle in 2nd it bogs and at speed its really hard to get the front to come up at all.
Is there something wrong here that i should look into? Or am i just expecting too much?

[DH400EX]

has any of the sprockets been changed. try droppin a tooth in the front.

[Derag2]

try downshifting.......... if your not running enough RPMS for second its gonna bog no real way around it. What is at speed? if you think the front will come up at 65 your crazy but i can only get the front to jump on 1-2 and a little bit on the 3rd shift.

[QuadJunkies]

Originally posted by Ukel
I recently bought a 2002 400ex and i've began to notice that my lowend in 2nd and 3rd is pretty bad...I guess i'm not really sure what i'm suppose to be expecting, but sometimes when i'm coming outa a turn and punch the throttle in 2nd it bogs and at speed its really hard to get the front to come up at all.
Is there something wrong here that i should look into? Or am i just expecting too much? Also, whats your main and whats the plug look like?? Could be some jetting as well..

[cf400ex]

my 400ex does the same thing i can barely bring it up in 2nd but not 3rd

[Rico400]

i would drop a tooth. we dropped 2 on my 400 and its very easy to bring the front end up, maybe to easy. so i think imma go up to a 14tooth

[Joe400ex]

ya im dropping my stock front to a 14

[2004exrider]

very happy w/ my 14/39 set up

[jak1389]

yea so am i. but with my engine be built for torque i may go back to stock gearing.

[QuadJunkies]

Originally posted by jak1389
yea so am i. but with my engine be built for torque i may go back to stock gearing. you get more torque from "displacemet" Do you mean you REV quicker? 4-5th gear is gonna suck BAD if you do, I have a Duncan 440 and I run 14-and stock in the rear(cant remeber what stock is) and for MX stock in the front up one in the rear , I like that extra bite for climbing dunes w a 14, but I do rev out faster ..


For a stock 400ex, my sufggestion would be to check more than just your gearing, check your jetting,do a Compression reading, if that looks good then your hoping for too much:p but a stock EX should pull an easy wheelie in third, afterall they are the wheelie masters!:macho

[MR.BIG]

Originally posted by cf400ex
my 400ex does the same thing i can barely bring it up in 2nd but not 3rd

You guys must have something wrong with your ex's. I had a slip on k&n filter, no airbox lid and rejetted and mine was pretty quick.
I could pull the wheels in any gear!

[Joe400ex]

when my 400 was stock i could pull a whellie in 3rd and 4th. i want to get a 14 tooth sprocket for the front i could only imagine getting up there quiker