Stock to Cross Country Racer

[exx400]

I wanna make my stock 400EX into a cross country racer. I dont wanna do any bore kits to the engine yet. What should I do. It is a 2002 some ideas would be great. My budget it around 5 grand.



Thanks Mitch

[yamablaster24]

i would get a new 450er and sell yours...

[atvrulz]

I second that.

[whiteflash]

ya, just get a 450r

[stc416rider]

if ur willing to spend that much money just sell urs and get a 450r or yfz

[K_Fulk]

I would race it the way it is. And save the money for a 450.

i owned a yfz and i've own 400ex's, and trust me the yfz isn't that great. yeah its super quick revving, but for a great trail or xc bike i still think a 400ex is the best all around bike. especially for the money. i believe people get too caught up in the hype and wanting to have the newest thing...for all around handling and a controllable predictable power you still can't beat the 400. and i don't think i even have to mention reliablity and ease /cost of maintenence. and don't give me the baloney about what the pros ride. they would ride a broomstick if they were paid to. and the fact that they are that good means they could win on a broomstick also....a 400ex with a 426 kit and some minor port/polishing and medium compression. will run just fine....

[jak1389]

i have my ex setup for xc and do the following mods:

suspension
slip-on pipe and filter
nerfbars


and those are the best and easiest mods to start you off. a set of holeshot hd's wouldnt hurt aswell.

[Rico]

Here's what my 400ex has for XC racing... I have NO problems keeping up with or out running 450's in field sections.


Bored .080 over to 416cc
HRC cam
JE Piston 10.8:1 Compression
Hinson Clutch Basket
Cometic Gaskets
Sparks Racing 8 Plate Clutch w/Heavy Springs
Sparks Heavy Duty Cam Chain
Sparks Racing Modified Carb
Lightened Flywheel
GT Thunder Porting
GT Thunder CDI
GT Thunder Air Box Intake Tube
GT Thunder Heavy Duty Head Studs
FMF Powerbong Header
Red HMF Silencer
K&N Filter w/Outerwear
Dynojets
160 main
42 Pilot
Motor oil - Mobil 1 15W-50 Synthetic

[atvrulz]

I raced a stock 400EX last year in about 6 hairscrambles. It is plenty fast and handles great. I would recommend replacing the front shocks though, they really suck.

[400exstud]

Hey rico, how do you like your lightened flywheel, GT thunder CDI and intake?


PS: I am running a HMF full and a K & N with a 160 main. Think I am still to rich?

[bullet3z]

This is just the type of thread that I was looking for. What are you GNCC racers doing to the front shocks? Are you getting them rebuilt or just going with aftermarket shocks? Also some info on the rear would help too.

I am attempting to get into GNCC racing on a budget with a used 400ex.

[Rico]

Originally posted by 400exstud
Hey rico, how do you like your lightened flywheel, GT thunder CDI and intake?


PS: I am running a HMF full and a K & N with a 160 main. Think I am still to rich?

The flywheel was lightened about a month after I bought the quad in 2000. I like it and have no complaints. The GT Thunder CDI and intake along with his play porting was a VERY nice addition to the motor.

ON the main jet, I can't really say since jetting varies. The motor will tell you what it needs. Mine is running like a raped ape now that the temp has dropped. I can barely keep the front end down going thru the trails...:eek2: Might be the 30lbs of wieght I dropped too.. LOL

My motor has been reliable as it can get and is bullet proof. I recently had Heavy Duty studs installed by GT Thunder which made it even more solid.

For GNCC Racing I'd go with shocks first over any other mod.