02' 400ex All Stock vs. HMF Slip-on

[Mobile Dyno]

Man HMF should Give me pipes for All the Free info I put out there on them...lol... Here is an 02' 400ex I did Last week. This one was All Stock also. I put the 18" Dynotires on and began getting a Stock Baseline. Here is what I got. The Mods I installed:

HMF Slipon-Yellow
K&N Filter
Airbox Lid OFF
K165 Long 6mm Hex

On the jetting, I wanted to see what would happen if I just changed the main. I put a K165 main in with the Airbox Lid Off. To my Suprise it was in spec. The K165 is a touch lean but I wanted that because i know he would have to put the Quiet Core in and didn't want it to go Power Loss Rich...The Setting you see with the 165 is still ok to run with the Quiet Core out...Thats why I left it.

[GPracer2500]

Awsome info Mobile Dyno. Thanks! Looks like HMF really got it right...

[Mobile Dyno]

After:D Nice Yellow

[GPracer2500]

Would it be possible to put the HMF slip-on and the WB full on the same graph? I know they're not the same bike but the two stock runs look nearly identical. Thanks!

[Mobile Dyno]

Graphs

[Mobile Dyno]

GP, I'll do that. This Tq graph is the Most Impressive part about this mod. Look how much Bottom end he got from the slipon:eek2: . Nice Increase HMF...:D

[Mobile Dyno]

Speed Grpahs..Remember This is with 18" Tires

[Mobile Dyno]

:)

[Mobile Dyno]

A/F

[Mobile Dyno]

here ya go GP, remember this is not same day and are different bikes

[Mobile Dyno]

..

[GPracer2500]

Cool. thanks

[krt400ex]

what would a full yosh or sparks pipe be??? i'd think that u'd get more than that out of a pipe

[bwamos]

Originally posted by krt400ex
what would a full yosh or sparks pipe be??? i'd think that u'd get more than that out of a pipe

They didn't replace the "pipe". Just the silencer. ;)

But still, a 28% increase in Torque at 4500rpm isn't too shabby.. lol.

HP increase isn't to shappy considering they are still using the stock header and stock cam. Flow will be somewhat limited on top. But as you can see keeping the stock header did wonders for the torque. If you used a larger aftermarket header, I doubt you'd get to keep all that torque.

[krt400ex]

Originally posted by bwamos
They didn't replace the "pipe". Just the silencer. ;)

But still, a 28% increase in Torque at 4500rpm isn't too shabby.. lol.

HP increase isn't to shappy considering they are still using the stock header and stock cam. Flow will be somewhat limited on top. But as you can see keeping the stock header did wonders for the torque. If you used a larger aftermarket header, I doubt you'd get to keep all that torque.

he said that the white bros was a full system though. am i right???

[Honda4lyphe]

wait wait, the white is a FULL system? if thats true the hmf slip on impresses me

[Mike[socal]]

Was the needle in the stock position? What's the lean spike at the beginning of the run?

[GPracer2500]

Originally posted by Mike[socal]
...What's the lean spike at the beginning of the run?

My guess is the accelerator pump wasn't able to keep up as the throttle was opened right at the beginning of the run.

[kxaddicted]

ha ha, thats all the power 400exs have? the way my friend(who owns a 400) talks youd think theyd outrun anything. hes a noob though. a 400 would definitly not outrun a kx 250 right? how much hp do kx250s have stock? mine is fmf fatty piped, jetted, uni air filter, and has reed valves. pic is not mine but is close enough to it.

[krt400ex]

Originally posted by kxaddicted
ha ha, thats all the power 400exs have? the way my friend(who owns a 400) talks youd think theyd outrun anything. hes a noob though. a 400 would definitly not outrun a kx 250 right? how much hp do kx250s have stock? mine is fmf fatty piped, jetted, uni air filter, and has reed valves. pic is not mine but is close enough to it.


you would whup a 416 with cam, pipe, piston, headwork etc with a stock kx250. a 125 with just a pipe will blow it out of the water

[krt400ex]

Originally posted by kxaddicted
ha ha, thats all the power 400exs have? the way my friend(who owns a 400) talks youd think theyd outrun anything. hes a noob though. a 400 would definitly not outrun a kx 250 right? how much hp do kx250s have stock? mine is fmf fatty piped, jetted, uni air filter, and has reed valves. pic is not mine but is close enough to it.

also a stock kx250 makes about 46 hp. with a pipe you can get roughly 3 more horses, and reeds will add even more. you will beat a stock 450R or yfz450 with that thing

[krt400ex]

Originally posted by kxaddicted
ha ha, thats all the power 400exs have? the way my friend(who owns a 400) talks youd think theyd outrun anything. hes a noob though. a 400 would definitly not outrun a kx 250 right? how much hp do kx250s have stock? mine is fmf fatty piped, jetted, uni air filter, and has reed valves. pic is not mine but is close enough to it.


sry for all the posts, but i couldnt help but laugh a little when i saw the service honda sticker on your swingarm...why is that?

[Mobile Dyno]

Stock KX250 does not make 46hp....30-33hp to the rear wheel. 125cc makes 22-24hp

[krt400ex]

Originally posted by Mobile Dyno
Stock KX250 does not make 46hp....30-33hp to the rear wheel. 125cc makes 22-24hp


very very wrong

[Mobile Dyno]

Ok. You know it all.. thats cool. i was just letting you know what the truth was so you don't tell people the wrong info. But do what you want:rolleyes:

[krt400ex]

Originally posted by Mobile Dyno
Ok. You know it all.. thats cool. i was just letting you know what the truth was so you don't tell people the wrong info. But do what you want:rolleyes:


dude, maybe you got some dyno charts from the '80s laying around and that is where you are getting your info from...but for everyone that is in the new millenium, a standard 250 2 smoke dirtbike will make in the 45-47 hp range, and a standad 125 2 smoke will make in the 32-34hp range.

i will personally look up some dyno charts. for everyone that doesn't agree with me, go to pingertalk.com (http://www.pingertalk.com) and anyone will be able to tell you the #'s of a modern 2 stroke

[400exridin121]

yea no way a 400ex even modded is going to beat a kx250 let alone one like yours

[krt400ex]

Originally posted by Mobile Dyno
Ok. You know it all.. thats cool. i was just letting you know what the truth was so you don't tell people the wrong info. But do what you want:rolleyes:


i just realized that maybe i came acrrossed wrong. maybe you were thinking of a 250F?

im just saying that i have seen dyno charts of 250 2 strokes and they make more than 33-34 hp stock. a 250R quad makes that much, but a 2 wheeler makes more

[400exridin121]

Originally posted by kxaddicted
mine is fmf fatty piped, jetted, uni air filter, and has reed valves. pic is not mine but is close enough to it.

Thats not even his thats just close, by the way when did you get the uni jake?

[krt400ex]

here is a dyno sheet of a bunch of 250 2 strokes. im sure you can figure out what brand by the colors. this is at the rear wheel and all stock

[CHEVYZ]

It looks like they made it with crayons LOL.

haha yeah it does is that Honda I see out on top? :)