On the Subject Of Hybrids

[RidetheRed]

For the people puttin in diiferent engines in there 250R 4wheeler, What engines are You puttin in?

[300ex_ryda]

anything that will fit pretty much, i put a 92 honda 250 VTR motor in my old 250R frame.

[baker250r]

its usually a yz426 or a crf450. the crf tho will not fit directly into a stock 250r chassis. u gotta get a aftermerket frame for it.

[wilkin250r]

I think the YZ426 is the most common. I've heard of a few people doing KTM hybrids, but I'm not sure what chassis they started with. I think it was the 400EX.

[RidetheRed]

So how will a 250 frame work with a dirtbike engine, since they dont have counterbalancers?

[wilkin250r]

Not all dirtbike engines are unbalanced. The CR250R isn't counterbalanced, but I hear it's not too bad. I think the yz426 IS counter-balanced.

[nacs400ex]

If I were doing a 4-stroke hybrid it would probably be a yz426. Seems like it's the most popular, and the best way to go.

The most common setup is the 400ex chassis, however many do it with aftermarket 250r geometry frames, which would be ideal.

However, if I was actually going to put the effort in going the route with a hybrid, I would definetly consider a higher displacement 2-stroke engine, just to be different from everyone else. I definetly think it's possible to create a trx500r without having too many vibration issues.

[350x_mutt]

the 350x motor works real well. not the most powerfull motor on the block. is about the same power as a 400ex.

[Mxjunkie]

yeah, with a 350x in a 250r its not to much of a job, with a stock frame you have to raise the frame 1 inch and all your mounts for tank, seat etc, then drop the lower tubes some so it will all clear the tank :)

Boy im really tired of hearing about this counterbalancing crap....

Ride any uncounterbalanced dirtbike like the cr500, it does not vibrate, what makes you think it will vibrate in a quad?

[Mxjunkie]

build one and ride it ;) I know someone who has put a cr500 motor in a 250r and they said it viabrated like hell.

[TheFontMaster]

Originally posted by Mxjunkie69
build one and ride it ;) I know someone who has put a cr500 motor in a 250r and they said it viabrated like hell.

He is. His thread is around here somewhere. Look at how he made the mounts for the motor. I have seen and read about how to put a cr500 motor into a quad frame, and dierwolf has gone a step beyond alot of what I have read to build a quality quad.

[250-R-250]

Yea he knows his **** when it comes to the R and conversion

[Toadz400]

Anyone have a link to his thread about building the hybrid and the mounts he made and what he did to reduce vibration? Sounds interesting to see.

Originally posted by Mxjunkie69
build one and ride it ;) I know someone who has put a cr500 motor in a 250r and they said it viabrated like hell.

Build one? have one for over a year now, just finished repainting it..

If your friend mounted it any way like the post i made about the one on ebay , i can see why it would vibrate...

Like i said before there is a right way and wrong way of doing something.

[Prey]

Originally posted by DierWolf
Build one? have one for over a year now, just finished repainting it..

If your friend mounted it any way like the post i made about the one on ebay , i can see why it would vibrate...

Like i said before there is a right way and wrong way of doing something.

have you made a post or anything detailing what the right way is? if not, could you post a little about it

[hontrx265r]

you know prey I'll trade you my hyrbid for your 450r! since you've been looking into it so much. You can even have your axis if you want.

Yes i have posted it even posted the process of milling the bushings.

someinfo in the Almost Complete!! thread in this forum.

[Prey]

Originally posted by hontrx265r
you know prey I'll trade you my hyrbid for your 450r! since you've been looking into it so much. You can even have your axis if you want.

i like your hybrid and all, but i have had that 450 for about 2 months now, i love it, and the whole reason i bought it was to race production class. so i am not inot getting rid of it

reason im into the hybrid thing is i have a spare frame sitting around that i would like to start a weekend puttering job with

the axis are going back, the guy sent me +2 arms instead of +3 and valved the shocks for +2, when i told him i got the wrong order he actuall got pissed at me and wants me to ship everything back to him?? so i am keeping the elkas and looking into either the walsh or epic a-arms

[Prey]

Originally posted by DierWolf
Yes i have posted it even posted the process of milling the bushings.

someinfo in the Almost Complete!! thread in this forum.

thanks wolf

[Mxracer53]

the reason it vibrates is because it isnt made for that frame. the original frame dosent vibrate because the engine mounts are in the right spot so there strong and the engine dosent vibrate

I said this before, english language seems to be very hard for some people.... If you read the thread "Almost Complete" you would see i posted a picture of the engine and the mount points i use, which is the EXACT same way it is mounted on the CR500R frame.
http://www.island-designs.com/pictures/mountpoints.jpg

you cannot! do this with the TRX250R '88 and upwards because the swingarm pivot spot is one long piece and no opening in the middle so you cannot use that engine mount point. I have a '86 which the swingarm does allow for this.

I posted how the vibration bushing i made are made and even showed a picture of a completed bushing
http://www.island-designs.com/pictures/IMGA0830.JPG

So here again, so you might understand better.
http://www.island-designs.com/pictures/JESUSCHRIST.jpg

so i ask the question again, if it dont vibrate in the CR500 why would you think it will vibrate on the quad.

[nacs400ex]

Originally posted by DierWolf
so i ask the question again, if it dont vibrate in the CR500 why would you think it will vibrate on the quad.

I will answer the question. Obviously a motorcycle chassis is much different than that of a ATV. The CR500 transfers some of its vibrations into the front suspension forks. Which Im sure you know a 250r does NOT have.

With that said, your not going to eliminate ALL vibration on a conversion, without those front forks. It may work, but its not the same as it was in the CR500.

I might add that, even while riding a stock CR500, there is clearly vibration in the motorcycle. What makes you think you can beat Honda's effort in reducing vibration on the CR500 motorcycle, with your trx500r?

Maybe im stupid... :)

isnt front forks shocks? yes... so yes my quad has that, 3 to be accurate.

Have you riden a cr500??? no there is no vibration, none that trattles your fingers and toes and breaks motor mounts thats for sure. I should know, owned one for many many years.

What makes me think i can better Hondas vibration problem?? simple honda had metal to metal mounting, i do not!.

The new TRX250R's with the cr250 engine must vibrate as well, or did they counterbalance those???

[nacs400ex]

Yes, the new trx250rs probably do vibrate a bit aswell. My 400ex had a noticeable vibration since it was new. Its not that it was unbareable, but it was there. Now I know for a fact cr500's vibrate I have ridden one. However you are right, its not enough to break the motor mounts.


:o Yeah Im glad you know that your ATV has 3 shocks, however it doesnt NOT have front forks. Which could cause some minor vibration combared to the motorcyle.

Im just having a hard time getting over the fact you have the ONLY conversion cr500, that has "ZERO, unnoticed vibration", when nobody that I know of has been able to do.

I guess its one of those things, you have to ride it to believe it :o

Never said it has ZERO vibration, nothing with a motor or moving parts has Zero Vibration.

I have no more vibration that say a Banshee, and surely not the kind of vibration i hear people talking about and breaking motor mounts.

But i must admit, from some of the mods i have seen people try i can clearly see why it would vibrate to hell and break motor mounts.

i wanna see some one put a xr650 motor in ther it would rape raptors:devil:

Originally posted by yzfmxer
i wanna see some one put a xr650 motor in ther it would rape raptors:devil:

Lots of things rape raptors and they are not even close to the amount of cc's the raptor has.

its a crying shame really :)

[baker250r]

Originally posted by yzfmxer
i wanna see some one put a xr650 motor in ther it would rape raptors:devil:

I know a guy that did that up here. xr600 tho. he stuffed it in a 400ex frame. He had to extend the frame its self. he totally worked the motor, and he races it MX. it is fast, but the handling isnt there since he botched up the geometry

[hontrx265r]

here are those pictures you wanted of my engine from the top