what size of bore would get me the most power out of my 400?

[schott400ex]

what size of a bore kit do i need to get the most power out of my 400ex?:devil:

[JDiablo]

440 .20 ova mayb .40 ova

[Cody_300ex]

I think if ya go .80 over it makes it a 416 but im not sure. If i had a 400ex I would deffinaley go with the Sparks 416 National Kit!

[schott400ex]

now wut about wiseco 440 kit for the 400

Originally posted by Lil_300Ex_Kid
I think if ya go .80 over it makes it a 416 but im not sure. If i had a 400ex I would deffinaley go with the Sparks 416 National Kit!

a 416 is .080 over...and i would go with a 416 and do exactly what he said...sparks 416 national...thats what i have pretty much...i jus saved my money and bought all the parts i needed seperatly...i think this is the best way to go

[hondafox440]

Theres no replacement for displacement!

Go 440 and don't look back. I have the Wiseco kit and love it.

You could always stroke it and go 502... :devil:

[tnine416]

what all would be included in a sparks national kit that makes it so much better? Im not tryin to be a wise ***, I was just wantin to know what items I should get first(cuz I gotta purchase a 416 piston and stuff)

Originally posted by tnine416
what all would be included in a sparks national kit that makes it so much better? Im not tryin to be a wise ***, I was just wantin to know what items I should get first(cuz I gotta purchase a 416 piston and stuff)

well sparks builds quality stuff and stands behind it...say you bought a rev box and u didnt like it...u can send it back and get all ur $...plus they can help you out in many ways...their pistons have a special mod, i dont exactly remeber you would have to ask, but it helps your bike run better it also comes with all the parts that will work together to make your bike have the most performance...check out their site www.sparksracing.com

[member]

502

[BIGRED400]

I don't know what a 440 feels like but I'm happy with my 416, buy the parts at C&D Racing and do it yourself...save a ton of money......Sparks can't be that much better

[nastynotchback1]

i dont have an overbore but all i have heard is go with the 416 or 426 because it makes better power.

[K_Fulk]

If you want the most power out of a bore You would have to go with the 92 mm big bore piston, you would also need to bore the cases. I think that would put you up to 460 or 465cc's.

[schott400ex]

now how could a 416 have more power than a 440 i don't understand that part cuz wiseco has everythang fer 239 on rocky mt atv
:confused:

Originally posted by schott400ex
now how could a 416 have more power than a 440 i don't understand that part cuz wiseco has everythang fer 239 on rocky mt atv
:confused:

a 440 has more power...it is just a 416 is easier to get power out of...to get a 440 to have more power then a 416 you must do neccisary mods which people do not like to spend extra money on...such as porting, carb, etc...which on a 416 is not a must

[chad502ex]

Originally posted by hondafox440
Theres no replacement for displacement!

Go 440 and don't look back. I have the Wiseco kit and love it.

You could always stroke it and go 502... :devil:


OTFLMFAO!!

yea, yur right- go 502!

no replacement for displacement
no guts no glory!

:)

chad502ex.com
:macho

[dbsbl1]

Originally posted by chad502ex

yea, yur right- go 502!

no replacement for displacement
no guts no glory!

:macho

The only thing that beats the cubic inch is the rectangular dollar:eek2:

[hondatv]

I agree with Chads502ex, If you are going bigger go 502.:D :D :D

[chad502ex]

Originally posted by dbsbl1
The only thing that beats the cubic inch is the rectangular dollar:eek2:

LOL!!

your absolutely correct!

If ya wanta play- you' have to pay!

;)

chad502ex.com

Go all out and get a 545 kit...:eek2:

[chad502ex]

Originally posted by Rico
Go all out and get a 545 kit...:eek2:

Actually, my next project starts next month to bore/stroke a 450R to a 567R!!! Can't wait

:macho :macho :macho

chad502ex.com (soon to be chad550r.com)

:)

[foleyit]

Originally posted by schott400ex
what size of a bore kit do i need to get the most power out of my 400ex?:devil:

I'm not sure if this enough horsepower. I just got back from Dumont and I was dragging with some friends. A buddy's raptor is piped, jetted, and intake is a pro-flow. It was our first chance to drag since my engine work (below). I was beating him. So a pipe yamaha 450 (owner claimed it was cammed, and jetted didn't know the owner so can't account for his riding abilities). I beat him up comp hill too! Made the drive home niiiice!

[cals400ex]

Originally posted by foleyit
I'm not sure if this enough horsepower. I just got back from Dumont and I was dragging with some friends. A buddy's raptor is piped, jetted, and intake is a pro-flow. It was our first chance to drag since my engine work (below). I was beating him. So a pipe yamaha 450 (owner claimed it was cammed, and jetted didn't know the owner so can't account for his riding abilities). I beat him up comp hill too! Made the drive home niiiice!


what size main are you running in that fcr?

Originally posted by cals400ex
what size main are you running in that fcr?

he prolly has a 165...that is what i have in mine...came from sparks pre jetted and i stuck it on and it was right on the mark :D

[foleyit]

Originally posted by cals400ex
what size main are you running in that fcr?

I believe CS put in a 165. I will need to double-check. My plug was fine so never opened up th carb.

Originally posted by foleyit
I believe CS put in a 165. I will need to double-check. My plug was fine so never opened up th carb.

its a 165...thats what is in mine...i got it from sparks also