How do you think a KX500 engine would perform in a quad chassis(lightend drag only)? I know that it will vibrate but how bad? I'v seen 250r's with cr500 engines in them. I'm just tired of the same old stuff, looking foir something totally different.

 

The KX500 is the fastest open class, off road bike made.
(yes, faster than the CR500)

It would make a killer drag race machine.
Dont quote me, but I think the stock motor makes somewhere around 65HP.

Vibration will be a problem, but with clever engine mounting, and steering stem work ect, it might be OK.
There is a guy on this forum that has a KX500 powered Tecate, im sure he will chime in here soon.


-Matt

 

Everyone seems to think that a KX500 motor will vibrate a quad frame into pieces. Personally, I don't get it. If they can make it work in a motorcycle chassis, why won't that same technology translate to a quad chassis? It seems to me that with the proper forethought, a strong, appropriately cushioned quad frame should work just fine with a big bore two-stroke motor. Am I missing something?[img]i/expressions/face-icon-small-confused.gif[/img]

 

Yes, you are missing something..

A motorcycle has forks to absorb most of the vibs.
A quad doesnt.

 

howdy
the Sorb... I don't think your missing any thing.
GreenGuy do it let us know how it turns out.
Mr.350x... yamaha did it with the 450. have you heard of KTM they are the fast line of motocycles on dirt. (Yes faster than kx,yz,cr)

 

The yamaha 450 is a 4 stroke.

Yes, of course I have heard of KTM.

I am fully aware of what it takes to put a big bore 2 stroker in a quad chassis.
I know it can be done. But, Greenguy, vibration is a big issue and cannot be just overlooked.

If you do not take the required steps to minimize it, you will NOT Be happy with the bike.
It will numb hands, and crack welds.

But your original question, how will it perform? It will rock.

 

plus the 450 has a counterbalancer and the kx500 does not.

 

I've ridden a Suzuki 500 Quadzilla and the vibration is certainly no worse than on a KX500 (I used to own a KX500 so I have some appreciation for the vibration it produces). And why would forks make any difference over shocks? Is there something special about the way Quadzillas were built that reduced vibration? Were they counterbalanced? I'm not trying to argue with you, I just want to understand. Thanks![img]i/expressions/face-icon-small-wink.gif[/img]

 

the LT500's were counterbalanced, which helped.

 

TheSorb: Yes, the Ziller is counterbalanced.

When riding a CR500, or KX500, the ride is totally acceptable. (vibration)
The fact that there are only two axis's, (front and rear) plus the forks that make the front suspention.
The forks absorb MOST of the vibration the big non-counterbalanced 2 stroke motor produces.

When you put that non counterbalanced motor into a quad frame, with 4 axis's, and no front forks,
the vibration is a problem.

People have worked with it using motor mounts and steering stems made with vibration absorbing rubber, extra thick grips ect...


Hope I helped... -Matt