build my motor

[russellsroost31]

hey guys im gonna get my motor rebuilt so shld i do a 416, a 426 or just some cams
i dont mind puttin in topend gaskets every couple months but i want a good reliable motor
i will prob start racing hare scramble and gncc but i will also race mx and faircross
now i do like to go ridin with my buddies every now and then but i still want alot of power

[CJM]

Copy my sig but do a 416.

[dxcody]

If your gonna start racing XC, and you drop all your cash into a engine your gonna be mad.

DO light motor work, and then light suspension work.

35-40 HP is no good on stock shocks.

[quadmanw]

A port and polish along with CJM's signature is what I run and it is an amazing set up. The P&P is pricey but it gives the motor the extra step to beat all the others

[russellsroost31]

how reliable is a 416

[dxcody]

Originally posted by russellsroost31
how reliable is a 416

Reliable as a stock motor pretty much.

[russellsroost31]

now if i just did a high comp piston and hot cams would i have a good amount of power and reliability still

[CJM]

Originally posted by russellsroost31
now if i just did a high comp piston and hot cams would i have a good amount of power and reliability still

Yep. Do a 407 or 416. My friend did a 407 and honestly its not all that much slower than my 426-if anything Im barely faster.

[russellsroost31]

wt kind of gas do i have to run with a 11:1 piston then

[CJM]

Originally posted by russellsroost31
wt kind of gas do i have to run with a 11:1 piston then

93 octane. Least thats what I run. Super unleaded is fine.

[russellsroost31]

ok now where can i get a 416 kit if you can sen me a link me and my buddy have been lookin for the past 20mins and cant find one

[CJM]

407 piston (http://www.ebay.com/itm/HONDA-TRX400EX-400EX-WISECO-PISTON-KIT-040-11-1-99-08-/230821355929?pt=Motors_ATV_Parts_Accessories&vxp=mtr&hash=item35be066199)

416 piston (http://www.ebay.com/itm/HONDA-TRX400EX-400EX-WISECO-PISTON-KIT-080-11-1-99-08-/230823812083?pt=Motors_ATV_Parts_Accessories&vxp=mtr&hash=item35be2bdbf3)

You buy the piston, then take your cylinder/jug to a machine shop and they bore it for the piston. There is no "kit" like you can buy a 440 which already comes with everything.

[Stickman400]

There isn't a "kit". You just order an 86mm (407) piston kit from ebay or somewhere. Search "Wiseco 11:1 86mm Piston Kit" on ebay and start shopping.

EDIT: CJM beat me to it with links, lol

[CJM]

Too quick for ya haha. :D

[russellsroost31]

haha
ill just tell the guy buildin my motor to do it
ill do a numuria piston tho and i just bought a hmf slip on

[Stickman400]

Namura is junk. Almost everyone on here that has ran one has melted it within 1 month of having it installed. Go with Wiseco.

[CJM]

Yea namura is absolute garbage.

[russellsroost31]

well then wiseco it is

[CJM]

My friend used namura in a blaster and a banshee cause they were cheap. 2 hours on the banshee the 1 piston melted (why didnt the other side we dunno) and the blaster blew at like 10 hrs. No idea why, they just melted. Everything was perfect too.

I think they use cheap materials.

[russellsroost31]

yea thts prob it

[russellsroost31]

hey i cant afford to bore it if i just do a high comp pistion and stage 1 hot cams will i have good power and reliability still

[CJM]

Originally posted by russellsroost31
hey i cant afford to bore it if i just do a high comp pistion and stage 1 hot cams will i have good power and reliability still

Chances are the cylinder is already out of round. if you cant bore it dont bother installing a new piston as it might not help all too much.

You want a stage 2 hotcam with a high compression setup, stage 1 falls on its face on the upper rpms.

Bore job is like 100 bucks or less btw, least the last few Ive had done.

[dxcody]

No matter what youll pretty much have to bore it.. even if you replace your stock piston with a 85mm wiseco, some boring or honing will more than likely be required.

I had 2 bone stock motors tore apart in my garage at the same time... mine and my buddies.

My buddies piston was too tight to fit in my cylinder and vis versa.

Just wierd like that... its true that every piston is slightly different.

[russellsroost31]

the other reason i was thinkin about not big borein it is so i dont have to race with 450s i mean i know i can i just dont wanna

[CJM]

Are they gonna measure the volume of your engine or something? Do a small overbore like 402, no ones gonna notice that if they can even check it.

[russellsroost31]

true
for whagt i need tho i just think the big bore is to much expense when ill prob sell the bike nxt year

[CJM]

You think your gonna sell it lol. Trust me thjese things are hard to sell.

But yea you need to bore it slightly, theres a huge chance the cylinders already done and if you got it all apart theres no reason not to do it. Imagine you dont and you gotta redo it all over?

[russellsroost31]

i get what you mean but wherew do i get a cylndar my limt is 1000 and im already lookin a 500 atleast in labor and parts for my tranny

[CJM]

Cylinders like 100 bucks for a bore job dude. You can do the rest of the work yourself, its very easy to assemble and whatnot.

[russellsroost31]

my motor is in the shop being rebuilt the guy i took it to said to call him with what i decide to do next wensday

[dxcody]

Originally posted by russellsroost31
my motor is in the shop being rebuilt the guy i took it to said to call him with what i decide to do next wensday

Idk what your going to race, but in the GNCC sport class (400cc limit) excludes motor mods.

So you can have a 440cc 400ex and it still meets the sport class standards.

[russellsroost31]

what ima do is if my cylinder is in good to ok shape ima just do a piston and cams if i need a new cylinder ima big bore it

[CJM]

Trust me when I say this: It aint worth it to do a big bore. The smaller bores rev much faster-much better for racing.

[russellsroost31]

when i say big bore i ment like a 416

[CJM]

Originally posted by russellsroost31
when i say big bore i ment like a 416

Sorry man, my bad. Big bore usually refers to a 440.

FWIW Like I explained earlier, a 402 or 407 is every bit as powerful as a 416, a whole 10cc isnt gonna gain you anything. 416 might also cost more cause they gotta bore it a whole bunch of times to get to that size.

[russellsroost31]

yea
the only thing is if i bore it i cant afford cams so ima just put a piston and cams in