WR450 F or CRF450 X

[CRF119]

Talking to a few of the motard guys most 450 bikes Dyno at 50hp out of the box and with a few mods, tuning, pipe ect you can expect to see 55hp.

[dammad1]

Talking to a few of the motard guys most 450 bikes Dyno at 50hp out of the box and with a few mods, tuning, pipe ect you can expect to see 55hp.

Yep I have heard the same thing about the 450's and the modern ones are certainly putting out more power than a 250 2t.

[warewolf]

Yep I have heard the same thing about the 450's and the modern ones are certainly putting out more power than a 250 2t.

They need it to carry around all that heavy, rattly valve gear...

http://www.dirtrider.com/reviews/mot...red/index.html.

A very interesting comment those fellahs made:

The Honda CR250R and Yamaha YZ250 are the only surprises from the dyno. The CR makes better power than expected from our on-track impressions, and the YZ looks a little tame compared with how it felt.

If you look at the dyno graphs, the CR is nicely smooth and even, whereas the YZ is lumpy and bumpy. The former is deceptively fast because it makes power with no fuss. The latter feels wildly powerful (but isn't) because the power keeps dipping then chiming in again.



I've seen dyno software that simulates a drag race based on the power curve. It would show the CR leaping in front of the YZ early on, and the YZ repeatedly gaining and losing against - but never catching - the CR. (Actually that would still be true even if the YZ made more power than the CR.) I know that is theoretical, but it illustrates the point that smooth power can be wicked fast without feeling that way.

[krad_nz]

Probably also the reason why people enjoy riding 2t, but actually ride faster on a 4t.

[kezzafish]

and the very reason that 450s are faster than 2 smokes

[krad_nz]

and the very reason that 450s are faster than 2 smokes

Except for whatever bike Chris Birch is riding....

[kezzafish]

yeah well that's a KTM so that's different. It's not fair to class those bikes in with "the rest"
Nah was referring to MX more. Enduro is more to do with skill so bike is up to the preference of the rider. Anyway. Knighter is faster and he rides a 450!

[krad_nz]

yeah well that's a KTM so that's different. It's not fair to class those bikes in with "the rest"
Nah was referring to MX more. Enduro is more to do with skill so bike is up to the preference of the rider. Anyway. Knighter is faster and he rides a 450!

Haha, touché.

[B0000M]

and the very reason that 450s are faster than 2 smokes

they are???

[chop]

where are 450's faster?

[secondfield]

Ha ... here you buggers go again ...

[B0000M]

where are 450's faster?

they are faster to tire you out trying to start a hot one

they are faster to empty your wallet in repairs

they are faster to get your favourite tracks shut down due to noise

they are faster to overheat on a trail

lol

[takitimu]

where are 450's faster?

They aren't, they are built for people who don't like changing gears, but then so is the WR250

Mmm ok faster for desert / supermoto racers & the elite professionals in MX/GNCC who can use the power ( say around 15 globally in each sport ).

[kezzafish]

changing gears slows you down, so does wild wheelspin, so do big fat wheelies. 4Ts are faster because the power is the similar except it's more useable. to say that a 4stroke tires you out and a 2t doesn't is rediculous. It's rider preference but to generalise..... 4strokes are faster. Put Philliparts on a 4t and a 2t around any MX track and guess which one he'll be faster on.
Mine is fast as fuck to start when it's hot. i press the button and it starts maybe 3 seconds at a guess. This is a stupid argument and has been done before. Also to say that only a few people in the world can "use the power" of a 4 stroke is dumb too..... almost every pro MX rider rides a 4T. It's the way of the world now. They all started making 4ts because they're faster ha ha haaaaaaaaaaaaaaa. Big 'ol mouth

[kezzafish]

did i mention how much faster 4strokes are when compared to 2 strokes? lol