Making a 4 stroke R

[vegas250rr]

Well after a weekend of pure abuse on my wifes SX, buy trying to follow my Father in-laws new Polaris SportsMan500EFI through some of the worst the Nevada mountains have to offer, I have decided that I need to take my running 185S and transplant its motor into my Roller R frame... now the questions start....
How do I go about making it fit, and how do I measure for a chain?

BTW, In case you were wondinger why I am going to do this.... ITS SIMPLE, the suspension on my SX just isn't enough for what I went through this weekend. picks to come really soon
http://i112.photobucket.com/albums/n194/youngberg1/hunting%20fishing/th_DSC03527.jpg (http://i112.photobucket.com/albums/n194/youngberg1/hunting%20fishing/DSC03527.jpg)
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http://i112.photobucket.com/albums/n194/youngberg1/hunting%20fishing/th_DSC03537.jpg (http://i112.photobucket.com/albums/n194/youngberg1/hunting%20fishing/DSC03537.jpg)
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[Dammit!]

Why not just upgrade the suspension on the 250sx? Put a 200x front end or I think the 83-84 R front ends fit. A works dual rate rear shock. Should make a very nice improvement.

[nouseforaname90]

The 185S more than likely will not have the kind of power you want in terrain like that.. especially with a much larger frame attached to it. Your best bet is to buy a 350X, or upgrade your rear suspension to a works shock and put progressive springs or a 200X front end up front.

[vegas250rr]

I hear what your both saying,... I really do, but this is what I have come up with as a solution. I am not looking for speed, and as far as the weight , the R frame weighs less.... I just want something that soaks up some bumps and gets me down the road. and I really want to keep my wifes bike as is... its clean, and unmolested. (JUST HOW SHE LIKES IT.... need I say more)

heres what I am working with... neighter are going to win a beauty contest, but I have a set of OEM plastics from my R, and all I will need to complete my FRANKENCRAWLER is a seat which is easyenough to come by
http://i112.photobucket.com/albums/n194/youngberg1/Trikes/parts%20bike/th_DSC03376.jpg (http://i112.photobucket.com/albums/n194/youngberg1/Trikes/parts%20bike/DSC03376.jpg)
http://i112.photobucket.com/albums/n194/youngberg1/Trikes/185S/th_DSC03511.jpg (http://i112.photobucket.com/albums/n194/youngberg1/Trikes/185S/DSC03511.jpg)

[200x newby]

you could buy a 200x they are cheap with great suspension and you could sell the roller R to put money in the 200x. by the way what year R are we talkin bout?

[nouseforaname90]

Yeah that is a good question.. because I figured he meant an '85/'86 R and they have to weigh more than the little 185S frame. But if its an '81/'82 frame then I can see the whole 185 engine in the R frame thing working.

EDIT: Well nevermind.. I just saw the pics and it appears to be an '85 frame.

[200x newby]

yeah i just looked at the post again first time pics did not show but yeah i could see a 81 82 but plz dont do that to a 85 86 heck id buy that swinger off of you it looks extended

[nouseforaname90]

It is.. looks like a 2 inch extension.
But it may be an '83/'84 frame.. they were very close to the '85 frame.. fill us in!

[vegas250rr]

http://i112.photobucket.com/albums/n194/youngberg1/Trikes/parts%20bike/DSC03385.jpg
85 250R dry weight 293
83 185S dry weight 270...
so I am only talking 20lbs+/-

oh and the swinger is +3.5"

[nouseforaname90]

You have to think though.. how much of that weight is the engine? Frame? Tires/wheels? The weight of the frame is what concerns me.. I just can't see the R frame being the same weight as the S frame..

[250r'en +TCB]

PLEASE do not waste a good 250R frame!!!!!!!!!!!!!!!!!!!

that's like dropping a 4 cylinder in a 1970 chevelle SS for christ sake!!!! WHY?????

buy a 350x/200x or the best and most cost effective thing to do would be to upgrade the 185's suspension with 83/4 250R forks.......

[team-red-rider]

those are 200x forks on the 185 now!!

[vegas250rr]

PLEASE do not waste a good 250R frame!!!!!!!!!!!!!!!!!!!

that's like dropping a 4 cylinder in a 1970 chevelle SS for christ sake!!!! WHY?????

buy a 350x/200x or the best and most cost effective thing to do would be to upgrade the 185's suspension with 83/4 250R forks.......

hmmmm, I knew I was gonna get some haters....
I am not waisting the frame... never said I was gonna cut it, I just want to know how to adapt my 185S motor to it.... sides that, I have never run the vin, I am not sure this frame is "worth" anything anyway

[vegas250rr]

those are 200x forks on the 185 now!!
no, they are the after market kit that you could by for them in the late 80's, and I think Ratvespa wants them.

[thefox]

Vegas, I think it is a cool project and I am looking forward to seeing it done. I understand what you are going for and it sounds like a great reason to undertake such a project. Good luck with it. :beer :beer

[vegas250rr]

Vegas, I think it is a cool project and I am looking forward to seeing it done. I understand what you are going for and it sounds like a great reason to undertake such a project. Good luck with it. :beer :beer

like the great "hootie" would say.... "Thizzzanks to the Fizzzzzox"

oh and by the way, I am NOT butchering my pristeen 85R, shes chillin in the Garage under the cover waiting for her chance to play at Razor

[nouseforaname90]

I think this is going to be a pretty simple project.. but you need to mount the engine so the sprockets line up just perfectly.
The only real problem I can forsee is the power, like I said. I'm sure on the asphalt and flat terrain, it will be a sick bike.. but everywhere else may be a problem. I guess its all in the gearing. Good luck to you man.

[ceaserthethird]

A 250R with a 185 cc eng. Sounds Good ... Don't have to Mix Oil with Gas

How Many Miles to the Gallon you think you'll Get ? ? ?

[vegas250rr]

A 250R with a 185 cc eng. Sounds Good ... Don't have to Mix Oil with Gas

How Many Miles to the Gallon you think you'll Get ? ? ?
well I can ride about 2.5-3 hours on a tank of premix on my R, I should be able to double that maybe 2 1/2 times the milage would be a conservative estimate

[350xBomb]

I think this is going to be a pretty simple project.. but you need to mount the engine so the sprockets line up just perfectly.
The only real problem I can forsee is the power, like I said. I'm sure on the asphalt and flat terrain, it will be a sick bike.. but everywhere else may be a problem. I guess its all in the gearing. Good luck to you man.

I agree...185cc? I hope you dont weigh much over a buck fifty.

[Jason Hall]

I think if you just look at where the carb will wind up you will change your mind. You'll have to cut the entire top section of rear shock mount out to make a 4 stroke engine of any kind fit the R frame. The tank will also be a hassle.

[Dave223]

This is something Ive been considering for some time now.
I finally got my old 84R back and the engine is toast. I recently picked up a good 300ex with a bad frame, plastics and no brakes. Im considering transplanting the engine, wiring harness and swing arm from the 300 to the R. It would be nice to have electric start and reverse with the looks of a trike. I have already taken measurements and it seems doable. The swinger on the 300 is 9" wide and the mounting location of the swinger on the R is not quite 10". The measurements of the engine area seems adequate for the 300 with the exception of the carb, it sits up kind of high.

I say go for it if thats what your wanting, but I do think the 185 will be underpowered. Just my .02, Dave

[thefox]

This is something Ive been considering for some time now.
I finally got my old 84R back and the engine is toast. I recently picked up a good 300ex with a bad frame, plastics and no brakes. Im considering transplanting the engine, wiring harness and swing arm from the 300 to the R. It would be nice to have electric start and reverse with the looks of a trike. I have already taken measurements and it seems doable. The swinger on the 300 is 9" wide and the mounting location of the swinger on the R is not quite 10". The measurements of the engine area seems adequate for the 300 with the exception of the carb, it sits up kind of high.

I say go for it if thats what your wanting, but I do think the 185 will be underpowered. Just my .02, Dave

Doesn't the 81-84 205R's have the chain on the right side where the ex has the chain on the laft side?