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2WD WR450 and previous version yamaha 2wd bikes
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Posted by: techman
I found this link and it piqued a vague memory of hearing about it before. Reading the articles at the link confirmed the history of the project and made me curious about what the particulars of the drive guts would be. Would there be any hydraulics guys, or anyone, who may have some inside scoop or educated deductions about the componentry?
http://ymedc.introweb.nl/en/archive/enduro/wr450_2trac.shtml
Posted by: MONKEYMOUSE
I have a link to a web page about this guy that built his own 2 wheel drive dirtbike. I'll post it when I'm back at my house! 
I would shur like a 2 wheel drive bike. A company makes them I know that, I think there called Recon?
Posted by: MONKEYMOUSE
WOW! now you got me thinking about how to build one. There would have to be some sort of impleer on the inside of the frunt hub? With hydo's running to it to force it to turn? I can see it geting complex FAST! OK I'm done till tomarro!
Posted by: luvtolean
Rokon, also the first company to use disc brakes on a production dirt bike if memory serves
Posted by: n8MX
The 2WD idea is a neat one... I was thinking about this a few weeks ago. I was thinking of an electric motor in the front hub, but then I figured out how much current it would take even at high voltages to make a decent amount of HP. The hydraulic approach looks reall compact.
Just think what traction would be like and how cool it would be to have roost from both wheels! A bike with twice the traction would definitely have the edge most places.
Andy
Posted by: jmics19067
handling would have to be greatly affected!!!!!!!1
you are going to be splitting the horsepower up. You will not have all the previous horsepower at the rear wheel alone. using the throttle to keep the front end light would probably feel pretty dang wierd. Besides stealing half of your rear wheel power you will also be pulling the bike lessening the effect of the rear wheel trying to lift the front wheel. Could be very effective for hill climbs?
although I think it would be a fun bike I dont think it would be effective for anything but slow crawling over everything. Having the two wheel drive motocross bike is ruining the motocross bike in my opinion, having a two wheel drive Fatcat or Bigwheel<or original Rokon> would be interesting though
Posted by: pursang262
WWW.2wf.com, look under latest news.
Posted by: LJW
Take a look at Ian Drysdale's project:http://home.mira.net/~iwd/2x2x2/index.html
Ian does not subscribe to the idea of changing one thing at a time, everything is radical!
Also, check out his V-8 project.
Posted by: MONKEYMOUSE
Hey LJW that's the link I was going to post lol. But with hydro's how would the gearing and throttel work? Bouth wheels MUST turn at the same speeds for a smooth ride. sho if u were to change the gearing for the rear you would have to some how calabrat(sp?) the hydo system? Oh well I'm not smart enough to figure this out.
Posted by: techman
Good info on the other efforts, although those people are keeping the detail secrets to themselves, just like Yamaha. What caught my interest in the Yamaha was that they raced with it and won some offroad races, ie it's very functional, not just a prototype. The 2 wheel steer is neat - could make for interesting wheelies, though.
Posted by: techman
updated info - it seems they're shooting to put this thing into production. I also didn't know Yamaha owned Ohlins.
http://www.motorcycledaily.com/19february03twowheeldrive.html
Posted by: motometal
one would think that under hard acceleration, as soon as the front got light, there would be no benefit to having 2wd. But, the extra weight on the front end would tend to prevent it from coming up in the first place. Don't know if i'd like that, it would probably feel bulky. Seems like the additional unsprung weight would make it tough for the suspension to work well.
What about a front wheel (only front) driven bike?
Posted by: Anssi
Quote:
Originally posted by jmics19067
although I think it would be a fun bike I dont think it would be effective for anything but slow crawling over everything.
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There was this guy who absolutely cakewalked at least one race of the Andros trophy (racing on flat ice tracks that have turns both ways) on a 2wd Yamaha (probably a YZ426F).
The commentary was in French and he only raced 1 or 2 races so I have no more info. That thing was fast in those limited traction conditions.
Posted by: techman
On front end weight - I know that a full tank of gas vs a near-empty tank of gas makes a noticeable difference in how much a bike likes to wheelie under acceleration. I'm guessing the drive motor and hoses add about 5 lbs to the front end. It would be real noticeable if it was an extra 10 lbs of hoses, fluid plus motor, but I'd think they'd optimise the weight down more towards 5 lbs. That weight would be further forward than a gas tank, so it would have more hold-down effect. However, I think one would change their maximum-acceleration riding technique from the traditional "try for 100% weight as traction on the rear wheel" to "it's ok to leave weight on the front wheel because it pulls too". I think it's claim to fame is that in non-perfect traction, ie where you probably couldn't do a wheelie without an awful lot of effort if at all, the extra pull from the front wheel would be the edge that wins. I agree that extra unsprung weight would make the handling feel a bit weird. I noticed that going from a light sand/loose tire to a heavy DOT knobby with heavier tubes too. I could feel the heavier wheels effect. I bet there was a lb or more extra unsprung weight on each wheel.
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