CRF450 Based Road Race Machine - Chicagoland Sportbikes
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post #1 of 32 (permalink) Old 10-08-2007, 09:51 AM Thread Starter
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CRF450 Based Road Race Machine

Oh my god... I think I just came in pants.

http://www.cycleworld.com/article.as...article_id=479

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post #2 of 32 (permalink) Old 10-08-2007, 09:54 AM
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there was a brief blurb on the work roland sands is doing on these in the new motorcyclist. fuckin' badass!!

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post #3 of 32 (permalink) Old 10-08-2007, 10:01 AM Thread Starter
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You'd have to gear tall to run at BHF or any one of the similar road race tracks for that thing to not explode though. You can turn that thumper into a fire breathing dragon pretty quick with overbore, cams, head work and big honkin carb. I'm sure 65 bhp isn't far fetched.

It is basically a stock 450 motocross bike. The chassis, swing arm, and forks are all stock. Suspension is modified and plasic, and you go racing. I wonder if those motors can handle that.

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post #4 of 32 (permalink) Old 10-08-2007, 10:02 AM
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I saw them at Laguna during the GP. They are cool.
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post #5 of 32 (permalink) Old 10-08-2007, 10:05 AM
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Oh man. I like where this is going. What's the dry weight on something like that?

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post #6 of 32 (permalink) Old 10-08-2007, 10:07 AM
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Oh man. I like where this is going. What's the dry weight on something like that?
I think I heard something in the neighborhood of 250#

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post #7 of 32 (permalink) Old 10-08-2007, 10:10 AM Thread Starter
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250 pounds. Jeesh! 65hp, 250 pounds. That is a respectable power to weight ratio. A stock newer 600 full of gas and oil weighs close to 400 and makes 100hp. Thats about the same ration. OH FUN!

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post #8 of 32 (permalink) Old 10-08-2007, 10:25 AM
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Gotta imagine maintenance is pretty reasonable bein' a single. What about the intervals for the valve checkups on that motor?

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post #9 of 32 (permalink) Old 10-08-2007, 10:30 AM
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it's a spec class bike. There will be no overboring, cams, or anything of the stilly diesel stuff. It'll be dog fucking slow. Elena Myers said that the bike was very fun but slow. Now this means something coming from a 125 rider.
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post #10 of 32 (permalink) Old 10-08-2007, 10:31 AM
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Gotta imagine maintenance is pretty reasonable bein' a single. What about the intervals for the valve checkups on that motor?
The maintanance on the valvetrain is costly and frequent. Especially when running at high rpm for long periods of time, road racing will do that.

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post #11 of 32 (permalink) Old 10-08-2007, 10:32 AM
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The maintanance on the valvetrain is costly and frequent. Especially when running at high rpm for long periods of time, road racing will do that.
I concur
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post #12 of 32 (permalink) Old 10-08-2007, 10:36 AM Thread Starter
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The AMA needs to bring back a lightweight GP style class in my opinion. Whether they make this happen or bring back the 250 class I don't care. I have never watched better road racing than the 250 class. If they do run a spec class for this bike it will be fun to watch because they are all on the same basic equipment. Kind of like the BMW boxer cup, spec class, fun to watch.

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post #13 of 32 (permalink) Old 10-08-2007, 10:41 AM
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The AMA needs to bring back a lightweight GP style class in my opinion. Whether they make this happen or bring back the 250 class I don't care. I have never watched better road racing than the 250 class. If they do run a spec class for this bike it will be fun to watch because they are all on the same basic equipment. Kind of like the BMW boxer cup, spec class, fun to watch.
The 250 is done and over. Nobody wants to watch a bunch of old guys working on their bikes in the pits with their shirts off and ass crack showing. It would be really cool if they had a spec class with no factory involvement whether it was a 450 class or something else. I'd totally do it.
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post #14 of 32 (permalink) Old 10-08-2007, 11:20 AM Thread Starter
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KX450F Road Race Machine.

Full explanation from Roland

http://450moto.blogspot.com/2007/08/...vers-450s.html

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post #15 of 32 (permalink) Old 10-08-2007, 11:34 AM
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The maintanance on the valvetrain is costly and frequent. Especially when running at high rpm for long periods of time, road racing will do that.
Costly AND frequent, or costly because it's frequent? I mean, how bad can a single valvetrain be - frequency aside?

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post #16 of 32 (permalink) Old 10-08-2007, 12:29 PM
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You'd have to gear tall to run at BHF or any one of the similar road race tracks for that thing to not explode though. You can turn that thumper into a fire breathing dragon pretty quick with overbore, cams, head work and big honkin carb. I'm sure 65 bhp isn't far fetched.

It is basically a stock 450 motocross bike. The chassis, swing arm, and forks are all stock. Suspension is modified and plasic, and you go racing. I wonder if those motors can handle that.
I thought they said something in motorcyclist about changing the steering head position on the frame?
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post #17 of 32 (permalink) Old 10-08-2007, 12:31 PM
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I thought they said something in motorcyclist about changing the steering head position on the frame?
no, they said stock frame. I read it on the shitter last night.

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post #18 of 32 (permalink) Old 10-08-2007, 12:35 PM
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These valvetrains are rediculously tight. Bouncing off the limiter for extended periods positively grenade the top end. Looking at $1500 top end if it goes boom.

I love the idea of a spec class, but this is not the right type of motor to do it. DRZ400, XR400/650 I could see it working. Not with these though.


And, is $10,000 really a cheap racebike?
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post #19 of 32 (permalink) Old 10-08-2007, 12:35 PM
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no, they said stock frame. I read it on the shitter last night.
I swear they said they had to modify the angle.
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post #20 of 32 (permalink) Old 10-08-2007, 12:55 PM
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I swear they said they had to modify the angle.
why do it with the steering head though? Just pull the forks up to compensate!!!


seriously though, easier to do with offset triple clamps.

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post #21 of 32 (permalink) Old 10-08-2007, 01:41 PM
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Originally Posted by Grasshopper View Post
You'd have to gear tall to run at BHF or any one of the similar road race tracks for that thing to not explode though. You can turn that thumper into a fire breathing dragon pretty quick with overbore, cams, head work and big honkin carb. I'm sure 65 bhp isn't far fetched.

It is basically a stock 450 motocross bike. The chassis, swing arm, and forks are all stock. Suspension is modified and plasic, and you go racing. I wonder if those motors can handle that.

Did you see the rear sprocket? HUGE!


$10K is cheap compared to a 250 isn't it?

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post #22 of 32 (permalink) Old 10-08-2007, 02:08 PM Thread Starter
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Did you see the rear sprocket? HUGE!


$10K is cheap compared to a 250 isn't it?
Compared to a 250 yes, not compared to an SV. You can buy 3 SV650s for the 10 grand.

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post #23 of 32 (permalink) Old 10-08-2007, 02:20 PM
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Compared to a 250 yes, not compared to an SV. You can buy 3 SV650s for the 10 grand.
That's what I'm getting at. Make a spec class out of the SV. It's already established, cheap and abundant parts, etc, etc. Fuck, tons of people already ride and race them. Just basically need to spec the tire and allowable motor/suspension/brake modifications and it's over.

Seems like a lot of shit to work through to get somewhere we could very easily already be. And nobody will think it's cheap when they're rebuilding top ends every race or three on the 450f's.
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post #24 of 32 (permalink) Old 10-08-2007, 03:29 PM
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Compared to a 250 yes, not compared to an SV. You can buy 3 SV650s for the 10 grand.

And slower than a typical honda RS 125, which is around $10K new with a seasons worth of spares.


I agree it would be very cool if they added a 650 twin LW AMA pro class. Suz and Kaw have product already being raced in MOTO ST and elsewhere. Wouldn't it be cool to see a modern 650 hawk from Honda in the mix. I am not sure if Yam has bike/motor in this class yet.

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post #25 of 32 (permalink) Old 10-08-2007, 04:29 PM
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I believe Canada has a spec SV class.

I think we would all like to see the cost of racing get lowered. The problem is that most people don't want to lower there standards of speed and machinery.

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post #26 of 32 (permalink) Old 10-08-2007, 04:47 PM
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Check this thing out. http://aprilianews.blogspot.com/2007...ek-rsx550.html
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File Type: jpg Aprilia%2BRSX%2B550.jpg (44.1 KB, 17 views)

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post #27 of 32 (permalink) Old 10-09-2007, 11:43 AM
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all the info in this article has probably already been covered. http://www.roadracerx.com/article.php?article_id=454
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post #28 of 32 (permalink) Old 10-09-2007, 11:58 AM
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Wow love the SXV/RS That has got to be fun!

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post #29 of 32 (permalink) Old 10-10-2007, 11:52 AM
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Wow love the SXV/RS That has got to be fun!
yeah but...we know the life span of those motors is very, very limited. Aprilia gave everyone what they wanted, a real race motor and performance from the factory. The only issue is having the budget to keep it fresh, or having spare motors.

Nothing wrong with that, just don't get one and then bitch about it going boom.

http://www.apriliaforum.com/forums/f...splay.php?f=50

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post #30 of 32 (permalink) Old 10-11-2007, 10:24 PM
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Quote:
Originally Posted by Reverend Rice View Post
The 250 is done and over. Nobody wants to watch a bunch of old guys working on their bikes in the pits with their shirts off and ass crack showing. It would be really cool if they had a spec class with no factory involvement whether it was a 450 class or something else. I'd totally do it.
I think you're confusing the 250gp series with the 883 sportster class

Whatever they do, I really hope they don't bring THAT one back from the dead.

How about...goldwings?
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