Has JGR always ran CF shrouds?

bullpen58
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bullpen58 11/2/2011 5:04pm
11/2/2011 5:04pm
All the CF in the world couldn't make the POS Yamaha anything but a boat anchor. Trust me, I know. I own one and I can't even pull a back-flip on that POS, whip it upside down, or turn it without falling over.
Sherwood
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Sherwood 11/2/2011 5:31pm
11/2/2011 5:31pm
bullpen58 wrote:
All the CF in the world couldn't make the POS Yamaha anything but a boat anchor. Trust me, I know. I own one and I can't...
All the CF in the world couldn't make the POS Yamaha anything but a boat anchor. Trust me, I know. I own one and I can't even pull a back-flip on that POS, whip it upside down, or turn it without falling over.
We got it you bought a fucking Yamaha.
newmann
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newmann 11/2/2011 6:02pm
11/2/2011 6:02pm
newmann wrote:
And for those that don't think there could be a weight advantage compared to plastics, this project bike with carbon fenders, plates, shrouds, tank, seat base...
And for those that don't think there could be a weight advantage compared to plastics, this project bike with carbon fenders, plates, shrouds, tank, seat base, air box and gas cap lost 9 lbs. on those parts alone. Here we have a 167 lb steel framed CR125 back in 1994. With all the "advancements" (lol) all the vital monkeys claim the 4 strokes have brought to the table, you really have to wonder how a modern "lites" (lol again) could tip the scales at 230 plus pounds.

GuyB wrote:
Nice trade show booth lure or project bike, but how practical was it in a real race?
Trade show bike? You crackin' me up Guy B! Unfortunately when DeCoster was going to test ride it for Dirt Bike magazine it was a mudfest. Fifty plus pounds of mud didn't work too well with the lightweight theme. Plus they reported the front fender cracked from the weight of the mud.Fragile fenders weren't the best idea, but everything else made a good bit of sense. But it did recieve some favorable reviews from what little time they got in on it. Light bikes do everything better. They get up to speed faster, they stop faster, they handle better, jump better, tire you out less.....there really isn't anything that they don't do better now is there?
RaceFace
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RaceFace 11/2/2011 6:06pm
11/2/2011 6:06pm
bullpen58 wrote:
All the CF in the world couldn't make the POS Yamaha anything but a boat anchor. Trust me, I know. I own one and I can't...
All the CF in the world couldn't make the POS Yamaha anything but a boat anchor. Trust me, I know. I own one and I can't even pull a back-flip on that POS, whip it upside down, or turn it without falling over.
You need to put it in the spokes, like with a baseball card. That offets the Yamahas issues and smooths everything out. You'll be doing backflips in no time.

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The Universe
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The Universe 11/2/2011 6:11pm
11/2/2011 6:11pm
yota wrote:
so you're saying that a thin flexible CF radiator wing won't cut the crap out of someone if it slams into them?
If you properly treat the edge, either in layup or trim, that's exactly what I'm saying.

If you were going to design a shroud for maximum weight savings and safety you'd treat the CFRP and graphics as a system. You would design a minimum gauge of CFRP to hold the shape of and choose a pliable tough material for your graphics sheet.

If you were still that worried about being cut, you could cobond a ply of kevlar to the CFRP. Honestly, if you're that worried, motocross isn't the hobby for you.
TankSlapper
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TankSlapper 11/2/2011 6:36pm
11/2/2011 6:36pm
The Universe wrote:
If you properly treat the edge, either in layup or trim, that's exactly what I'm saying. If you were going to design a shroud for maximum...
If you properly treat the edge, either in layup or trim, that's exactly what I'm saying.

If you were going to design a shroud for maximum weight savings and safety you'd treat the CFRP and graphics as a system. You would design a minimum gauge of CFRP to hold the shape of and choose a pliable tough material for your graphics sheet.

If you were still that worried about being cut, you could cobond a ply of kevlar to the CFRP. Honestly, if you're that worried, motocross isn't the hobby for you.
How about after its broken in a crash and has razor sharp pieces sticking out?
The Universe
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The Universe 11/2/2011 6:41pm
11/2/2011 6:41pm
TankSlapper wrote:
How about after its broken in a crash and has razor sharp pieces sticking out?
I see you read my response thoroughly. You must be a composite design genius. Let me know if you need a job, we're hiring design engineers.
wacker
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wacker 11/2/2011 9:23pm
11/2/2011 9:23pm
bullpen58 wrote:
All the CF in the world couldn't make the POS Yamaha anything but a boat anchor. Trust me, I know. I own one and I can't...
All the CF in the world couldn't make the POS Yamaha anything but a boat anchor. Trust me, I know. I own one and I can't even pull a back-flip on that POS, whip it upside down, or turn it without falling over.
Crazy, I bought two and have literally done all of those things on mine. I have crashed one once though in the last two years, and coincidently I believe it was the fault of the radiator shrouds. But then again, I probably shouldn't have attempted a 150"+ step down on an extremely gusty day.

I am just more shocked about the fact that so many people are concerned about the slim chance a piece of ill-fabricated piece of a carbon fiber shroud could somehow jump off of a dirt bike (that you are riding at 40mph+ and that is made of steel and aluminum and weighs 250lbs with large unforgiving rotating masses and sharp chains and sprockets) and slice your neck in half.

Maybe take the pipe and muffler off, too? If the bike falls on you it is possible that you could be severely burned. Oh, that reminds me that they run on an extremely flammable fuel and if an astroid hits your tank could suddenly burst into flames. These things are dangerous and I think that adds to a most of the fun into the factor. There's always MX vs ATV I guess.......
ocscottie
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ocscottie 11/2/2011 9:28pm
11/2/2011 9:28pm
HAR! good shit Dustin Cool
williamsmotowerx 11/2/2011 9:36pm
11/2/2011 9:36pm
150"... you spode

now if it was 150'.... just sayin'
wacker
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wacker 11/2/2011 9:46pm
11/2/2011 9:46pm
Damn, definitely missed the shift key on that one.

Oh, and just so I don't get flamed too much, I am going to go ride my YZ 125 2-STROKE TOMORROW.
swap
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swap 11/2/2011 10:35pm
11/2/2011 10:35pm
It's real carbon fiber. The bike is super thin now.
gsxr6
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gsxr6 11/2/2011 11:21pm
11/2/2011 11:21pm
ocscottie wrote:
Here is your answer, straight from the man himself: "We are testing carbon fiber shrouds, in fact we are testing quite a few innovative concepts" That...
Here is your answer, straight from the man himself:

"We are testing carbon fiber shrouds, in fact we are testing quite a few innovative concepts"

That is what i love about JGR, they have all the resources and not afraid to experiment and try new trick stuff.
TJ 755 wrote:
I think these are part of the slimming of the front of the bike which was part of what James liked. Look how close the tip...
I think these are part of the slimming of the front of the bike which was part of what James liked. Look how close the tip of the shroud is to the triples. I still dont like those number plates that extend down with zip ties. Zip ties just dont mix on such a trick bike.
i cut those off my cycra stadium plates and rivet a braket to the back of the plate and put a screw from the bottom thru the fender to the bracket to hold the bottom of the plate in place. looks sweet
gsxr6
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gsxr6 11/2/2011 11:21pm
11/2/2011 11:21pm
is lighter lol
SEEMEFIRST
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SEEMEFIRST 11/3/2011 12:15am
11/3/2011 12:15am
Looks like the number plate and shroud don't have much clearance between each other. Probably the angle, but it looks like an interference fit.
DrSweden
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DrSweden 11/3/2011 2:22am
11/3/2011 2:22am
newmann wrote:
And for those that don't think there could be a weight advantage compared to plastics, this project bike with carbon fenders, plates, shrouds, tank, seat base...
And for those that don't think there could be a weight advantage compared to plastics, this project bike with carbon fenders, plates, shrouds, tank, seat base, air box and gas cap lost 9 lbs. on those parts alone. Here we have a 167 lb steel framed CR125 back in 1994. With all the "advancements" (lol) all the vital monkeys claim the 4 strokes have brought to the table, you really have to wonder how a modern "lites" (lol again) could tip the scales at 230 plus pounds.

GuyB wrote:
Nice trade show booth lure or project bike, but how practical was it in a real race?
newmann wrote:
Trade show bike? You crackin' me up Guy B! Unfortunately when DeCoster was going to test ride it for Dirt Bike magazine it was a mudfest...
Trade show bike? You crackin' me up Guy B! Unfortunately when DeCoster was going to test ride it for Dirt Bike magazine it was a mudfest. Fifty plus pounds of mud didn't work too well with the lightweight theme. Plus they reported the front fender cracked from the weight of the mud.Fragile fenders weren't the best idea, but everything else made a good bit of sense. But it did recieve some favorable reviews from what little time they got in on it. Light bikes do everything better. They get up to speed faster, they stop faster, they handle better, jump better, tire you out less.....there really isn't anything that they don't do better now is there?
That bike is pretty damn cool! 167 lbs? Holy shit!!! Why did they change the forks on that bike though? Only bad thing with light weight I can think of would be when bike is used as a projectile? Tongue

One wonder where those tricks parts are today? I saw some carbon stuff on Ebay from the MXA light weight CRF project. Tried to get a hold of some of the pieces, but the sellers idea of the value didn't correlate with mine. Whistling
lux_06
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lux_06 11/3/2011 2:52am
11/3/2011 2:52am
carbon fibre can flex - ask the red bull F1 team. since last year they have been having to prove their front wings arent flexing too much for the regulations. they layed the fibres parrelell as far as i know. red bull js7 connections too!!!
newmann
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newmann 11/3/2011 6:11am
11/3/2011 6:11am
GuyB wrote:
Nice trade show booth lure or project bike, but how practical was it in a real race?
newmann wrote:
Trade show bike? You crackin' me up Guy B! Unfortunately when DeCoster was going to test ride it for Dirt Bike magazine it was a mudfest...
Trade show bike? You crackin' me up Guy B! Unfortunately when DeCoster was going to test ride it for Dirt Bike magazine it was a mudfest. Fifty plus pounds of mud didn't work too well with the lightweight theme. Plus they reported the front fender cracked from the weight of the mud.Fragile fenders weren't the best idea, but everything else made a good bit of sense. But it did recieve some favorable reviews from what little time they got in on it. Light bikes do everything better. They get up to speed faster, they stop faster, they handle better, jump better, tire you out less.....there really isn't anything that they don't do better now is there?
DrSweden wrote:
That bike is pretty damn cool! 167 lbs? Holy shit!!! Why did they change the forks on that bike though? Only bad thing with light weight...
That bike is pretty damn cool! 167 lbs? Holy shit!!! Why did they change the forks on that bike though? Only bad thing with light weight I can think of would be when bike is used as a projectile? Tongue

One wonder where those tricks parts are today? I saw some carbon stuff on Ebay from the MXA light weight CRF project. Tried to get a hold of some of the pieces, but the sellers idea of the value didn't correlate with mine. Whistling
The forks are works Showa's with magnesium lowers, superlight stuff. And that bike is still complete and living in Ca.

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DrSweden
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DrSweden 11/3/2011 9:42am
11/3/2011 9:42am
newmann wrote:
The forks are works Showa's with magnesium lowers, superlight stuff. And that bike is still complete and living in Ca.
Tnx for the info. U know if it's in use or in some art form meaning exebition?
MotoGUY
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MotoGUY 11/3/2011 12:13pm
11/3/2011 12:13pm
Yes it is real carbon not apart of the graphic. They are also going to be running carbon fork guards as well. My friend back home works for the shop that is making the stuff for them. They also make CF Valve covers for most of the nascar industry. If you want something made in Carbon Fiber they can more than likely make it.
uk125250
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uk125250 11/3/2011 12:59pm
11/3/2011 12:59pm
newmann wrote:
The forks are works Showa's with magnesium lowers, superlight stuff. And that bike is still complete and living in Ca.
You ever see those forks for sale?
bearded clam
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bearded clam 11/3/2011 1:02pm
11/3/2011 1:02pm
GrapeApe wrote:
So is the JGR setup just a carbon shroud, or could that be a one piece shroud/airbox setup? Seems like an awful lot of work for...
So is the JGR setup just a carbon shroud, or could that be a one piece shroud/airbox setup? Seems like an awful lot of work for just a shroud, I'm guessing there's more to it.
that would make sence!
Xsenter
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Xsenter 11/3/2011 1:29pm
11/3/2011 1:29pm Edited Date/Time 11/3/2011 1:30pm
The Carbon fiber tanks have been used on Rinaldi factory Yamaha bikes in Europe for 2 years. It´s all one piece, looks to be the same on the Stewart JGR bike aswell.

Took this pic at the swedish gp this summer:





The Universe
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The Universe 11/3/2011 8:32pm
11/3/2011 8:32pm
Nice find Xsenter. I could see this stuff being used in MX as it's cheaper to fab parts than the ply by ply layup.

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