MX 400ex

[250xjohn]

Hey guys, this is my second 400ex thought id show it to you all! havent been on this site for some time aha

[250xjohn]

more bad pics

[250xjohn]

....

[KKiowaTJ]

Nice looking 400. I like the bars and stem, Whats the stats on her?

[250xjohn]

Thanks! Im looking to get full fenders also.



Engine:
87mm 11.1 wiseco piston (416 cc ) (8 hrs)
stage 2 hot cam
kibblewhite valves and springs
ported head
wiseco timing chain
dirt digger clutch
hmf full pipe with carbon canister
sparks racing carb ( 39 fcr )
sparks racing cdi
pro design intake with k&n filter
all new seals and gaskets
new oem battery/solenoid/regulator/coil
ngk racing plug wire/cap



Body:

laegers +1 1/4 swingarm
lonestar 2+2 axle with aluminum sprocket hub
laegers subframe with fender/seat lock, ac racing 250r wide grab bar
houser +2 steering stem/1 1/8 anti vibe clamp

ac racing pro peg nerfs with heel guards
quad tech desert seat/cover
maier stealth black plastic/fenders
trx 450r front shocks

streamline steel braided brake lines all around
trx450r rear caliper/hub/rotor
blingstar sprocket/disc guard
renthal gold chain/sprockets
powermadd handguards/handwraps

hrc skid plate


twin row billet carrier
all bearings/bushings good. ready to ride

extras:
good frame with title
ims 5 gallon desert tank


stock red plastics/light

[KKiowaTJ]

I like the look, Red cut plastic would look better IMO, But to each their own. That's how I want mine to look with cut oem red plastic so I an still run the stock lights.

[Speed37]

To get the most out of that cdi, you might want to consider a stage 3 cam. It's more usefull for top end power. But thumbs up for a mx 400!

[250xjohn]

Thanks guys! i have cut reds but they are pretty rough shape. i like the lights better or even a hood with the maiers. I rather have the stock plastics i think they look better.

Stage 3 cam? ill take that into consideration

[Speed37]

stage 3 has power top end power curve then 1&2, in your case you have the cdi box, which raises your rev ceiling a lil more. 400ex's aren't top end quads, they make their make HP mid way through the power band.

[JOHNDOE83]

stage 3 has power top end power curve then 1&2, in your case you have the cdi box, which raises your rev ceiling a lil more. 400ex's aren't top end quads, they make their make HP mid way through the power band.


Actually, 400ex is a very good top end power quad, if you have no topend power or it revs slow in the top end your main jet is to small.

My 440 with a stage 2 cam, a 450r carb and kibblewhite valves was AMAZING on the top end, deff a high rev motor it was almost like a 2 stroke power band.

The issue is 400ex is very lean from the factory, a stock 400ex needs like a 170 main jet "NO LIE".

After you put pipes cams and carbs youll easily be close to a 200 size main jet.

Small increases in jetting like going from 148 to 155 is pointless, yoll never know the true potential of a 400ex motor until you go BIG on main jets.

I Used a 220 main jet in mine, another 440 guy here uses a 230 main, a stock bore EX that beats 450r's drag racing here has a 200+ size main jet.

GO BIG on jets and youll wake up any 400ex, the reason why people say a 440 revs slow is because they built a 440 then pt a 180 main jet in it and said it was jetted properly "but its not" its way to lean thats why it revs slow.

Also read the hotcams website, a stage 3 cam is designed for the stroker kits.

Try the main jet tunning method in the FAQ section here www.jetsrus.com

Nice quad BTW.

[250xjohn]

thanks guys for the info! its been a while for 4 strokes but compaered to my R this bike does rev pretty high and has great power deliverance. Comparable to the 250r

[Speed37]

Do you wanna sell that ims tank? :)

[Exrider911]

Do you wanna sell that subframe? :)