whats everybodys opinion on this 440 kit???

[trx400EXtreme]

wiseco 440 kit w/ sleeve piston and gaskets. what is everybody experience with Wiseco? thanks.

[BlaineKaiser450]

i think that would be pretty sweet

[boosted3g]

Wiseco and cometic are some of the best you can buy.

[400exrider707]

What compression is that kit?

[250exkid]

i no im hacking your thread but do they make a 406cc kit? and the 416 kit can you still run reg. gas and not the expensive stuff

[spec]

I had the wiseco 440 kit in my 400 for over 3 years. And I don't know how long the person before me had it in it. It finally gave out on me this last summer. But up untill that point it was a very strong machine. When I rebuild if I stick with a 440 it will be that kit again.

[trx400EXtreme]

400exrider707- the kit can be 11:1 or 12.2:1 if i remember right.


250exkid- yes they make a 406 kit. and about the gas, its the compression your running is what makes a difference in what gas you run. 11:1 is said to be the highest you can go and still run pump gas on a 400ex.

[250exkid]

ok thanks by meaning pump gas you mean the lowest grade can be 83octain or what ever the lowest is?

[trx400EXtreme]

yea im sure you can still run it and it will run fine, it just wont keep your engine quite as clean on the inside..... but it will work.

[speedjunkie13]

I have the 11:1 kit in my quad, it pulls very strong and the only problem i have had so far is a blown head gasket, but that' my fault because HD head studs were not installed right away. So if you do get any of the big bore kits spend a little extra and get the HD head studs.

250exkid - If you are going to raise the compression i wouldn't run anything less than the highest available at the pump, which in my case is 92 or 93. running 11:1 with 87 is just asking for trouble.

[400exrider707]

93 octane only up to 11:1. Even still some guys have trouble getting away with 93 pump on 11:1 and mix race fuel. If you're doing a 440 kit, dont expect to just buy that kit on ebay, slap it on and be happy with it. Especially if you go with the 12.5:1 kit. If you do that, you SHOULD put in a heavy dut rod, and heavy duty head studs, at the least.

A 440 kit seems like a waste to me unless you're building the entire quad up. Like a cam, carb, port work, free flowing full exhaust, and the likes.

[trx400EXtreme]

just to clear something up i did plan on buying HD head studs and running 93/94 octane.;)

[400exrider707]

Originally posted by trx400EXtreme
just to clear something up i did plan on buying HD head studs and running 93/94 octane.;)

Good idea. So I take it you're planning on the 11:1 route? I'd also recommend the heavy duty cam chain while its apart.

So to answer the original question, as long as you know what is needed its a good kit. Who are you having do the machine work? Any other mods you're planning at the same time?

I ran an 11:1 wiseco in my 400EX and liked it. No problems here. I wonder if that 440 kit has the usual problems that all the 400EX pistons from wiseco did, with not having the compression advertised, as most wiseco 400EX pistons are developed for the XR 400, which has a smaller deck height.

[trx400EXtreme]

yea i plan on doing 11:1. and actually i think i'm leaning toward a 426 as of now. mainly because of reliablity and its alot cheaper... and also it should be plenty of power to tide me over until im old enough to get a job and save for a 450. along with the 426 i'll be doing HD head studs, and prob. a curtis sparks advanvced timing key. then eventually i'll save up more for a hot cams stg. 2, CRF cam chain, and possibly some head/valve work.

[tgreenz400]

Originally posted by trx400EXtreme
yea i plan on doing 11:1. and actually i think i'm leaning toward a 426 as of now. mainly because of reliablity and its alot cheaper... and also it should be plenty of power to tide me over until im old enough to get a job and save for a 450. along with the 426 i'll be doing HD head studs, and prob. a curtis sparks advanvced timing key. then eventually i'll save up more for a hot cams stg. 2, CRF cam chain, and possibly some head/valve work. DOO ITTT!!!:macho

[yfzrider45]

Not too spoil your thread, but my friend had his 400 stock and it was the most reliable thing ever until he put in a 440 kit.....maybe it was put it wrong or sutn was touched! i just wanna say i dont recommend it! (get a 450 if u wanna increase power i guess) HAPPY NEW YEAR!!

[trx400EXtreme]

Originally posted by yfzrider45
Not too spoil your thread, but my friend had his 400 stock and it was the most reliable thing ever until he put in a 440 kit.....maybe it was put it wrong or sutn was touched! i just wanna say i dont recommend it! (get a 450 if u wanna increase power i guess) HAPPY NEW YEAR!! LOL as much as i'd love a 450..... it's WAY out of the question. and like my post says above.... it's 426 for me.

[DAVE14]

I have all that stuff in mine very strong machine that can hang with the 450 s all day but youll wanna run better head studs with higher compression , upgraded cam ,jetting, pipe etc. & it will wake it right up

[250exkid]

like a 406cc kit with compression 11:1 would 87 be fine to run in it?

[JOEX]

Originally posted by 250exkid
like a 406cc kit with compression 11:1 would 87 be fine to run in it?
Very doubtful...

[250exkid]

oh ok thanks!

[ohiomotoxer]

Ive got the 440 hi comp, heli coiled HD cyl studs, CRF time chain, Web Cam, FCR39, new valves, guides and springs in my EX.
It is reliable and I cannot believe the difference it made in overall power.

[250exkid]

daaang ohio man that 400ex of urs sounds awsome

Originally posted by 250exkid
like a 406cc kit with compression 11:1 would 87 be fine to run in it?

I wonder how much a of a gain a 406 would give you over another 400ex with the same mods on a stock bore. It has to be like 2HP because thats only 9cc more which isnt much. I bet you will win against that other 400ex with the same mods and running stock bore but i'm not sure what gains you would see.

[JOEX]

Originally posted by FoxHondaRider
I wonder how much a of a gain a 406 would give you over another 400ex with the same mods on a stock bore. It has to be like 2HP because thats only 9cc more which isnt much. I bet you will win against that other 400ex with the same mods and running stock bore but i'm not sure what gains you would see.
The gains will be from the higher compression... I would think when someone goes to a 406 it's to clean up the bore.

i'm saying though have a stock 400ex with a 11:1 piston, HMF slip on and jetted the same as a 406 with the 11:1, HMF and jetted correct what gains would you see? 406 is normally like you said for a bore cleanup.

[ohiomotoxer]

Its not too shabby....





Originally posted by ohiomotoxer
Ive got the 440 hi comp, heli coiled HD cyl studs, CRF time chain, Web Cam, FCR39, new valves, guides and springs in my EX.
It is reliable and I cannot believe the difference it made in overall power.


http://img2.putfile.com/main/7/19913533965.jpg