ready to upgrade. what way do you all think i should go?

[2qk4u]

my son has a 400ex. it is stock bore. i want some power out of it. what way should i go. do i want to got to a 416 or go straight up to a 426? is there a big difference between the both of them? give me you opinons please.

thanks

I have a white brothers full system and a hotcams stage 2 cam and head has been ported

[ckasper18]

I would go with the 416 kit and then when it needs to be rebuilt you can go with the 426 kit.

[underpowered]

Originally posted by ckasper18
I would go with the 416 kit and then when it needs to be rebuilt you can go with the 426 kit.

ditto, i have ridden both and i say do the 416 for now then go to teh 426 later. power is great on both but the 426 has a lot more torque than the 416. right now i have a426 and love it but when i have to rebuild i am going to a 416 so i can go back to teh 426 later and have to resleeve less. i would never go 440, but thats just me.

[Abrannan19]

well opinions are like buttholes everbody has one...what I would do is put a pipe on it for now and see how that does for him...unless its blown up why bore it... My mods are in my sig and just those few lil things made a pretty big diffrence to me...if that is al ist of the mods on his 400ex already please forgive me.. bore it out or buy a 450R

[frankiedizzle56]

in my 400 i got a 416 kit and it give great power my friend with a stock bore gets on my quad and says it has so much more power then his

[Abrannan19]

oh yea ..no denying the power increase a buddy of mine has a 426 w/ a hot cam stage 2 port and polish yoshi pipe and k&n and it ridiculous but I dont like it at all seems that something is always wrong with..propbaly just a crappy installation but ne ways

[440racer66]

i have a 440 kit i love it i dont have any problems. it all depends who does the work i got a guy to do mine that was highly recomended i would ask around in your area the local racers will tell you thats what i did. a 416 is nice too 426 is also nice i like them all but its what you are riding in xc mx or just trail you decide

[Bigun55]

im putten a 440 in mine in 3 or 4 more weeks. 1 of my buddys hav 1 on his 400 and it made a world of difference, its tough 2 had it in over a year and its doin fine. i dont know nuthin about the 416 or 426's though. But id say they would work pretty good 2.

[lightning_2000]

i had 426 went 440
if u want the best go 440 but u will have to pay
just search this site and u will find everything u need

either way u go get the heavy duty stud kit
port and polish nice exhaust

[ckasper18]

I have a 440 motor for sale big stud kit tc cam brand new sleeve and piston went threw the whole engine slighty ported head hd valve springs this is my spare engine complete for my daughters quad looking to build her a new trx450r for next mx season.$800.00 920-313-0027...Chris