YFZ450 vs400 EX

[qwad guy]

what do you think would win a 06 YFZ450 stock or an 02 400ex w/ 426 kit, hot cams stage 2, new valve cover gasket, newer honda clutch, exhaust.

[jshtex]

They would probably be close enough that the better rider would win.

Our 426ex is pretty close to our 04 yfz with some bolt ons.

And FYI the valve cover gasket won't make any difference... :D

[metalmellinium]

450 will smoke it

[300ex mxracer]

Originally posted by jshtex
They would probably be close enough that the better rider would win.

Our 426ex is pretty close to our 04 yfz with some bolt ons.

And FYI the valve cover gasket won't make any difference... :D

if its a cosmetic gasket it gives you like 8.125 hp!! lol

[firefighterjosh]

Originally posted by metalmellinium
450 will smoke it

Wrong:rolleyes:

[metalmellinium]

Wrong are you serious, wait i bet you are. I forgot im on a honda site shoot! You guys here are always right and win darn it

[300ex mxracer]

Originally posted by jshtex
They would probably be close enough that the better rider would win.


what he said.^^^

[firefighterjosh]

Originally posted by metalmellinium
Wrong are you serious, wait i bet you are. I forgot im on a honda site shoot! You guys here are always right and win darn it

No this is not a Honda site. Look at my sig. 400ex, banshee, King quad. I also have at my house a KFX, Bomb, Cdale.

I am not a take a side person lol.


My 416ex will keep up with a 450 pretty good. the only place it gets me in top end. other wise we are about side by side. He might get a tire length on me until 5th gear. And my quad is set up for XC so speed is not my thing anways.

The yfz would have about 39hp and the ex would have about 35 hp and chances are that the yfz would be piped so it would have around 50 hp.

[jshtex]

Originally posted by turtlebus
The yfz would have about 39hp and the ex would have about 35 hp and chances are that the yfz would be piped so it would have around 50 hp.

Man thats some pipe......

[joeb23]

I raced my friends yfz when i just had the 440 and jetted and they were pretty close. But with the stage 2 cam and full system pipe i could prolly beat it now.

[300ex mxracer]

Originally posted by jshtex
Man thats some pipe......

where can i get one of those pipes?:devil:

Originally posted by 300ex mxracer
where can i get one of those pipes?:devil:

Well a yfz does make close to 50 hp with just a pipe. Like the mid 40's so thats still pritty close to 50.

[AtvMxRider]

Also depends on what kind of race you are talking about

[300ex mxracer]

Originally posted by turtlebus
Well a yfz does make close to 50 hp with just a pipe. Like the mid 40's so thats still pritty close to 50.

wouldnt mid-40's be like 45hp instead of 50hp???? i can understand a 5-6 hp gain but have not heard of a 11hp w/ just a pipe.

Originally posted by joeb23
I raced my friends yfz when i just had the 440 and jetted and they were pretty close. But with the stage 2 cam and full system pipe i could prolly beat it now.

Well yeah i went to a race and watched 2 400ex's smoke them big fast 450's. I meen here on ex riders theirs all none stop talk about how the 400's cant touch the 450s but so far i havent seen a 400 not be able to stick with a 450 except in "some drags".

I went out to a track. It was 2 400ex's, 3 450r's and the rest were yfz 450's. Well out of the 3 450r's 2 roled over. A couple yfz's stalled and wouldn't start up to easy. And well the 400ex's just smoked them all. Both ex's took 2nd and 3rd. The ex's were loosing all the 450s and that just shows that a 400 can easly win against a 450. Could them guys on the 2 400ex's have gone faster on the 450s? I dont really think so cause they had the same amount of power and the geomertry of a 400ex/250r are the best you can find no yfz450 or 450r frame geomitry is as good as the 400ex's/250r's.
Also the ex is air cooled and runs not. Well them yz motors run hotter than the ex motors so..........

[300ex mxracer]

Originally posted by turtlebus
Well yeah i went to a race and watched 2 400ex's smoke them big fast 450's. I meen here on ex riders theirs all none stop talk about how the 400's cant touch the 450s but so far i havent seen a 400 not be able to stick with a 450 except in "some drags".

I went out to a track. It was 2 400ex's, 3 450r's and the rest were yfz 450's. Well out of the 3 450r's 2 roled over. A couple yfz's stalled and wouldn't start up to easy. And well the 400ex's just smoked them all. Both ex's took 2nd and 3rd. The ex's were loosing all the 450s and that just shows that a 400 can easly win against a 450. Could them guys on the 2 400ex's have gone faster on the 450s? I dont really think so cause they had the same amount of power and the geomertry of a 400ex/250r are the best you can find no yfz450 or 450r frame geomitry is as good as the 400ex's/250r's.
Also the ex is air cooled and runs not. Well them yz motors run hotter than the ex motors so..........

racing between a 450 and 400 is not all machine. i use to be able to beat 450s on my 300ex but that doesnt mean the 300 was better, it just means i have better riding skills than the other guys. rolling is also rider error. the yfzs stall easier than the 400 because they are made to be performance racing machines, not trail bikes. the 450r geometry is based off off the 250r chassis so i dont see how the 400s is so much better?? the 450 motors run hotter because again they are performance racing machines.

[300ex mxracer]

Originally posted by turtlebus
Well yeah i went to a race and watched 2 400ex's smoke them big fast 450's. I meen here on ex riders theirs all none stop talk about how the 400's cant touch the 450s but so far i havent seen a 400 not be able to stick with a 450 except in "some drags".

I went out to a track. It was 2 400ex's, 3 450r's and the rest were yfz 450's. Well out of the 3 450r's 2 roled over. A couple yfz's stalled and wouldn't start up to easy. And well the 400ex's just smoked them all. Both ex's took 2nd and 3rd. The ex's were loosing all the 450s and that just shows that a 400 can easly win against a 450. Could them guys on the 2 400ex's have gone faster on the 450s? I dont really think so cause they had the same amount of power and the geomertry of a 400ex/250r are the best you can find no yfz450 or 450r frame geomitry is as good as the 400ex's/250r's.
Also the ex is air cooled and runs not. Well them yz motors run hotter than the ex motors so..........

racing between a 450 and 400 is not all machine. i use to be able to beat 450s on my 300ex but that doesnt mean the 300 was better, it just means i have better riding skills than the other guys. rolling is also rider error. the yfzs stall easier than the 400 because they are made to be performance racing machines, not trail bikes. the 450r geometry is based off off the 250r chassis so i dont see how the 400s is so much better?? the 450 motors run hotter because again they are performance racing machines.

Originally posted by 300ex mxracer
racing between a 450 and 400 is not all machine. i use to be able to beat 450s on my 300ex but that doesnt mean the 300 was better, it just means i have better riding skills than the other guys. rolling is also rider error. the yfzs stall easier than the 400 because they are made to be performance racing machines, not trail bikes. the 450r geometry is based off off the 250r chassis so i dont see how the 400s is so much better?? the 450 motors run hotter because again they are performance racing machines.


Well actually the 450r frame is not much like a 250r frame. It was said to be a cross between the 400ex and 250r frame but if it was it be really good but is not. I think honda screwd up bad on the the 450r's frame. Main reason is the 450r is tippy compaired to the other 450's and the 400ex/250r. Honda i think tried to make it a racer but wanted it to be a trail quad too but tried to hard so it turnd out not as good handling as the other 450s. I rode a 450r and its not tippy but it did want to tip more than my ex in the turns. Dirt wheels said it was tippie and had to light of a front end for mx which it does compaired to the 450s but then again dirt wheels favors the yfz450 over all other quads. The 450r is a good mx'er but its only real disadvantage is it sits a little higher than other quads and the front pushes more in the turns.

[fasssst400ex]

i had a 400ex and now have a 450r. the R is in no way "tippier" than the 400. it had a light front end but honda fixed that by a longer swingarm. you can adjust the ride height on any of the 450s so you cant really say it sits higher

Originally posted by fasssst400ex
i had a 400ex and now have a 450r. the R is in no way "tippier" than the 400. it had a light front end but honda fixed that by a longer swingarm. you can adjust the ride height on any of the 450s so you cant really say it sits higher

Yeah but if you put the 450r at its lowest hight and then the yfz at its lowest hight the yfz will sit almost 2" lower.

[fasssst400ex]

not to be mean but i cant read that. u need to re type that

[300ex mxracer]

my R sits at 6 1/4 in now set for mtocross... i dont see why you wont need it any lower...

Originally posted by 300ex mxracer
my R sits at 6 1/4 in now set for mtocross... i dont see why you wont need it any lower...

Well yeah that hight is good. I was just talking about stock against stock that the yfz will beable to always sit lower. 6 1/4 for mx is sitting low so if you can handle mx that low thats good. Most mx people run at 8". I run at a 6" even cause i just valved my shocks hard so i could run that low. It works out good.