my 400ex sucks n sand

[shellz4sand]

Help? I need more bottom end power in the sand.I took it to Sand Mountain this weekend, & had to pull the steep hills in 2nd pinned.What would you think?Big bore kit?I am used to my two stroke, but want to build my fourstroke up.It jumps better and is easier to start when my boys crash.I seriously need some help.

[pharit]

get a smaller counter sprocket

[wilkin250r]

Originally posted by shellz4sand
I took it to Sand Mountain this weekend, & had to pull the steep hills in 2nd pinned.

That's a 400EX for ya. My girlfriend has never been able to climb in anything but 2nd gear. A smaller front sprocket might let you climb in 3rd gear, but you won't be going any faster.

I would suggest a high compression piston and an aggressive camshaft. It probably wouldn't hurt to go slightly larger on the bore at the same time, like maybe a 416.

I'm curious, did you get harrassed by the Park Rangers this last weekend? I was out at Sand Mountain, camped out front right at the base of the race hill, and they were CONSTANTLY stopping by our camp and citing us for stupid stuff...

[zephead400ex]

2nd gear is the best (pretty much the only) gear to climb in on a 400ex. A 416 kit like Wilkons suggested would be a perfect bore for the dunes. Once the finances work out for me, a 416 is in store. But until then...it's 2nd gear for the hills:ermm:

[Eddiesanders250]

yep a 250 would work for ya

[LazeR]

thats how mine was too.....then i put my HMF Slip-on on and i can climb a lot more in 3rd gear now

[Eddiesanders250]

id go back to the two stroke if i were you

[shellz4sand]

I want both!!I am putting the new engine in my LT250 this weekend.A girl can never have to many bikes!!!!!!!(sandrails next)

[EPDP99]

if you want low end power go with a stroker. at the steep hills in impereal dunes id smoke all 2 strokes and 450s. Im not trying to brag cause long hills they both beat me. But the short steep hills i got tons of power and torque.

[chad400ex]

If it's stock, you're stuck with it pegged in 2nd gear. After pipe/filter/jetting and a 14 tooth front sprocket I was climbing hills in 3rd gear. Then I put in a high-comp piston and cam...with the 14 tooth sprocket I could climb hills in 3rd and my front tires would be coming up off the ground, so I switched back to the 15 tooth and it's just right in 3rd gear. 2nd gear starts at the bottom of tree shots too.

[Eddiesanders250]

Originally posted by EPDP99
if you want low end power go with a stroker. at the steep hills in impereal dunes id smoke all 2 strokes and 450s. Im not trying to brag cause long hills they both beat me. But the short steep hills i got tons of power and torque.

no i think you got it the other way around. wait no a 250 would beat you on any hill. that is a little modded 250

[Joe400ex]

i dont know how big these hillls are but i was at badlands yesterday and i was pulling dirthills and sand dunes 3rd gear all day easy and i weight 200. My sprockets are all stock .:devil:

[plkmonster2]

That sucks wilkin. When I was at Sand Lake, they had a few rangers. I was pouring kerosene on the fire, when i got carried away, and caught the jug on fire. The ranger just laughed. I guess it depends on the time of year you go..

[plkmonster2]

Oh yeah, and about the 2 gear thing. A pipe really helped me. I had a FMF Megamax on there, but it wasn't jetted right, and it would pull some hills in 3rd. One hill had to be 2nd gear, because i had no run at it, and it was damn near straight up. I'm hoping to go back up with my HMF and see how I do against the other 400's.

[shellz4sand]

I gave up on it! I gave my 400 to my son. He loves it.I bought a Banshee.I know I am a trader but I have the need for speed, and I love my Banshee, and my son loves the 400 so everyone wins.See ya in the sand:blah:

[Joe400ex]

Originally posted by shellz4sand
I gave up on it! I gave my 400 to my son. He loves it.I bought a Banshee.I know I am a trader but I have the need for speed, and I love my Banshee, and my son loves the 400 so everyone wins.See ya in the sand:blah:

im thinking of going with a banshee and giving my 400 to my dad.was tthe banshee a nice change. srry guys like he said u need speed somtimes i love it qiukness

[shellz4sand]

It is very fast. I have only piped it and changed to K&N's, and twist throttle.Yesterday I rode about 20 miles on it up in the mountains.It's a nice change from the 400.

[trx310]

Man, pipe that 400, put a hot cam and a dyyna fs ignition on it, i can climb huge hils in 4th gear and the front wheels off the ground on mine.

[ocitman]

i have the exact same problem at sand mountain.
i was told by someone else to put a stock jet in it for higher elevations, like sand mountain. the elevation there is about 4000 ft.

[MR.BIG]

When I had my 400ex I put a white brothers slip on removed air box lid and rejetted it and it made a big difference. Then i sold it to get the 450r and that thing is a rocket!

[ocitman]

what did you rejet it to for sand mountain?

stock is 148 but a friend of told me not to run a stock jet with a pipe and air filter.
i have a DMC pipe and a K&N air cleaner.
the jet i'm running now is 155 and it works great at lower elevations, like below 2500'.

Sand Mountain is 4000' elevation and it has no power at all.
dont want to run it to lean.

[MR.BIG]

I live in PA! With the lid removed and the white brothers slip on I was running a 165 main jet.

[shellz4sand]

It isn't a jetting issue for our 400ex, because I live at 4200 ft elevation.I am going to change the sprocket , and see how it runs Memorial weekend.It is now my 9 year old bike so it will have plenty of power for him.Thanks!
Shelley

[ocitman]

what jet size are you running. i'm also considering changing the front sproket. i'll have to see what i already have installed.

i'll be at sand mountain mem day weekend also. i'll be the guy on the red 400ex going up competition hill pinned in 2nd gear.:cool: :rolleyes:

[shellz4sand]

I don't know what jets are in there. My ex set it up when I bought it.I won't be pulling competion hill in 2nd pinned on my Banshee :( sorry!. I will be there Thursday night through Monday

[EPDP99]

Originally posted by Eddiesanders250
no i think you got it the other way around. wait no a 250 would beat you on any hill. that is a little modded 250

Dont get me wrong they would catch me except the short hills. Banshees, 250r, 450s(both) i would take on the short steep hills. but they would catch me on longer hills. they are definitally faster than me so im not trying to brag. my quad make best power up to tops of 7000rpm. so once the 2strokes really get revving the smoke me.

[Eddiesanders250]

ill agree with that

[shorty1]

I have the same problem with my 2005 400EX. I was in Buttercup last weekend and had to take Competition Hill in 2nd. I made it to the top but I was really slow and started bogging down towards the end.

[shellz4sand]

Where's Buttercup? Is it big sand dunes?

[EPDP99]

Originally posted by shellz4sand
Where's Buttercup? Is it big sand dunes?

Its part of the imperial sand dunes(glamis, gorden wells, buttercup, ogilby)

[shorty1]

I love riding at Buttercup. The best time to go is Thanksgiving weekend. There are so many people out there. Good times! My husband is from Yuma so we are out there all the time.

[EPDP99]

buttercup is great. If youve seen someone wearing a superman costume thanksgiving weekend that was me.:D

[shorty1]

Sweet! That is hilarious! I will definitely be out there again this Thanksgiving. We come in a huge group. We have two 40 foot trailers, one white and the other black. We have 2 quads, a blue lifted golf cart, 2 sandrails, and a lift Jeep. We are out there Thursday-Sunday. Last year I dropped my phone in the toilet out there. Ya, you guessed it, I left it there!

[EPDP99]

we go the weekend before all the way through. we hve like 40+ people in our group.

[shorty1]

That's awesome! I have such a good time out there. Maybe we run across each other out there. Where in Arizona are you from?

[EPDP99]

Tucson

[shorty1]

How do you like it?

[EPDP99]

i love it here. summers are hot though. great for my job, keeps the money coming in.

[shorty1]

San Diego is ok I guess. I am originally from LA so San Diego is very different for me.

[EPDP99]

right on. i havent been there in a long time. weather is nice year round.

[shorty1]

It was so freaking hot this weekeng. It was about 100 at my house. I love the heat but the weather has been so craping this year I need to get used to the summer weather again.