largest 400ex sleeve bore

[RiderTRX400ex]

the largest bore size on a stock sleeve is 88 mm or 426 correct?

what are the downsides of a 426 with 11.1

anyones run very hot or have problems with head studs or head gaskets?

thx

[FoxRacing81]

Originally posted by RiderTRX400ex
the largest bore size on a stock sleeve is 88 mm or 426 correct?

what are the downsides of a 426 with 11.1

anyones run very hot or have problems with head studs or head gaskets?

thx

88mm is the biggest bore on the stock sleeve. It's kinda too far, but it'll work. I went with a new sleeve just to be safe.

I road mine through 1 half tank of gas when 2 headstuds pulled out and blew my headgasket. I got GT Thunder H-D Headstuds and Cometic Flex Steel gaskets and no problems since (gone through 2 tanks since they we're installed).

My old rod was bad, so I went with a Wiesco Heavy duty crank and rod to handle the bigger bore and more compression.

A new cam and port and polish will really open her up if you have done so already...

I love my 426. The difference in power is night and day. You won't be disappointed.

I'd highly reccomend going with JE or Ross (I went with Ross myself) over Wiesco. Wiesco bases there 426 pistons off of the XR400 which has slightly higher compression then the 400ex, thus making the compression lower then 11:1.

If you have anymore questions, just ask.

-Justin

[RiderTRX400ex]

its for a buddy of mine, hes getting wiseco 11.1, hes got a hotcam, full yoshi and stuff already..

what compression did u have that made your head studs pull?

yea i know about the xr to ex gasket compression difference

[RiderTRX400ex]

eh?

[REF426]

Make sure to go with new sleeve, mine just went KaBoom:grr: 426 bore on stock sleeve, 11:1 wiseco. What's left of sleeve and piston are stuck in engine case, have to take engine out ( if I ever get swingarm bolt out!) and split to see what is screwed up. I haven't had any problem with the stock bolts or gaskets.

[Rider400ex26]

I was just woundering how much the hd head studs would cost my dad has forked out some serious money to me to fix this wheeler of mine and i was just woundering how much there Where cause i got the biggest bore for stock sleeve 88mm and i read ur guys post and didnt liek them to much......:ermm:

[Rider400ex26]

nvm about everythig i asked a found the Hd heavy duty head studs i ordered a pare of thoughs a emaild LA sleeve corp Is that all i need for a 426 to run properly ?


Thanx
Aim colfer26:D

[Rider400ex26]

Originally posted by Rider400ex26
nvm about everythig i asked a found the Hd heavy duty head studs i ordered a pare of thoughs a emaild LA sleeve corp Is that all i need for a 426 to run properly ?


Thanx
Aim colfer26:D

[z400riderz400]

yea, that was the first week you got it man, you need a up to date the picture. lol


look in your sig too, you wrote kimblewhite its kibblewhite.

[RiderTRX400ex]

there she is, when you dont change your oil, for 9 months

[RiderTRX400ex]

piston

[RiderTRX400ex]

why your rebuilding again, now

[RidrKFX]

Hey man maybe you should really think about getting a Josh-proof wheeler so you wouldnt have to fix it all the time. Or maybe listen to your friends.....:D cause they know best

[z400riderz400]

that was great dylan but i dont think there is such a thing.

[F-16Guy]

Originally posted by RiderTRX400ex
there she is, when you dont change your oil, for 9 months
Or wash it.

[RidrKFX]

yeah and those times i pushed it into the mud and when ryan was washing it and spraying the hose down your pipe and that mud fight where i nailed you in da face with mud. Josh is the owntinator.:D

[z400riderz400]

Dylan, your going to make him cry.

[RidrKFX]

Didnt i do that when i hit him in the face with mud tho?????:confused: :p

[Rider400ex26]

o yah dylan u totaly made me cry u see all the mud tears dripping out of my eyes :) i still go through mud better then all u guys so beat that b*tches

[Rider400ex26]

hey i washed it i just blew it up at the begging of the winter and it sat on my porch so yah u kno she looks better now and i DO CHANGE MY OIL NOW u guys r such great people

NOT

[Rider400ex26]

there she is now if the pic will show

[underpowered]

i had some problems with my 426 11:1 when i first got it. i blew on gasket and pulled my headstuds. i got it fixed and blew another gasket. now i have a flexsteel and have not had any prblems yet after about 5 months and many tanks of gas.

[Rider400ex26]

So your telling me if i get a flexsteel head gasket im pretty much set? i was told just the Hd head studs and A new sleeve would do it Or jsut a new damn wheeler but weve put to much money into it to just turn around and sell it :mad:

[Rider400ex26]

Do u have any pics of ur wheeler bye any chance?

[underpowered]

i do not have HD head studs. i used Heli coils to put NEW stock studs in whne mine pulled the first time. The flexsteel gasket definitally made a difference in mine. mine is also on the stock sleeve. It runs warmer than a stock one would but not too hot. I have had no heat issues once i got my jetting right. I run a little rich to keep it cool. too lean creates too much heat.
http://img.photobucket.com/albums/v94/jonesy4x4/4003.jpg
http://img.photobucket.com/albums/v94/jonesy4x4/4002.jpg
http://img.photobucket.com/albums/v94/jonesy4x4/4261.jpg

[Rider400ex26]

im just going to get the studs anyways i mean tonight i picked up my cylinder and i could losen a head stud with my fingers so i didnt think much of that so im just going to get a new ones and a new sleeve but thanx

[Rider400ex26]

this is just a rndom bump ina field that my friends and i where hitting high 3rd

[prepracing]

mine has been a 426 bored on the stock sleeve for 2 years now with an 11:1 comp arens piston and I have no heavyduty studs. I have a pingry oversized oil tank for cooling and thats it. Never had any headboltstud/headgasket/overheating problems....knock on wood... so far. I clean my airfilter after every few rides ( k&N). And with 100 octan klotz mine seems to perform the best and run the coolest. Also just running regular honda oil ( not sythetic ). With reegular maintenance you should have zero problems with a 426 bore on a stock sleeve. :D

[Rider400ex26]

so many people say i need head studs and sh*t and i need a new sleeve but i guess i mise well get a new sleeve and studs so i feel safe about my wheeler not blowing up but my luck she will once again but thanx for telling me that anyways how does it go?