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Thread: Making a 4 stroke R

  1. 03-26-2007, 06:43 PM #1
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    Making a 4 stroke R

    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






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  2. 03-26-2007, 06:49 PM #2
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    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.
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  3. 03-26-2007, 06:50 PM #3
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    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.
    '85 250SX - My first ever trike and my pride and joy
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  4. 03-26-2007, 06:54 PM #4
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    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

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  5. 03-26-2007, 07:00 PM #5
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    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?
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  6. 03-26-2007, 07:02 PM #6
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    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.
    '85 250SX - My first ever trike and my pride and joy
    **Check Out The Whole SX Project Here!!**
    '85 350X - 10:1 Piston, performance cam, '86 engline/carb
    '85 Powervalved Tri-Z - Fully modded - Soon to have a Corey Sprock 310 kit
    '85 250R - Began the modification process. This bike is going to scream! -295cc kit, Ported, Drag intake, 40mil Keihin, VForce reeds, shaved head, PT High Rev pipe, Fat Boy 2 Silencer, +4 Durablue axle, +2 swinger-
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  7. 03-26-2007, 07:07 PM #7
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    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
    ATC500AF
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  8. 03-26-2007, 07:10 PM #8
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    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!
    '85 250SX - My first ever trike and my pride and joy
    **Check Out The Whole SX Project Here!!**
    '85 350X - 10:1 Piston, performance cam, '86 engline/carb
    '85 Powervalved Tri-Z - Fully modded - Soon to have a Corey Sprock 310 kit
    '85 250R - Began the modification process. This bike is going to scream! -295cc kit, Ported, Drag intake, 40mil Keihin, VForce reeds, shaved head, PT High Rev pipe, Fat Boy 2 Silencer, +4 Durablue axle, +2 swinger-
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  9. 03-26-2007, 07:15 PM #9
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    85 250R dry weight 293
    83 185S dry weight 270...
    so I am only talking 20lbs+/-

    oh and the swinger is +3.5"
    85 350X, 85 250R, 99 TRX 90, 05 Predator 90, 05 TRX 400ex, 2019 RZR4 XP100
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  10. 03-26-2007, 07:28 PM #10
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    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..
    '85 250SX - My first ever trike and my pride and joy
    **Check Out The Whole SX Project Here!!**
    '85 350X - 10:1 Piston, performance cam, '86 engline/carb
    '85 Powervalved Tri-Z - Fully modded - Soon to have a Corey Sprock 310 kit
    '85 250R - Began the modification process. This bike is going to scream! -295cc kit, Ported, Drag intake, 40mil Keihin, VForce reeds, shaved head, PT High Rev pipe, Fat Boy 2 Silencer, +4 Durablue axle, +2 swinger-
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  11. 03-26-2007, 07:34 PM #11
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    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.......
    "I have but one lamp by which my feet are guided, and that is the lamp of experience." -Patrick Henry

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  12. 03-26-2007, 07:36 PM #12
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    those are 200x forks on the 185 now!!
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  13. 03-26-2007, 07:37 PM #13
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    Quote Originally Posted by 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.......
    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
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  14. 03-26-2007, 07:38 PM #14
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    Quote Originally Posted by team-red-rider
    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.
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  15. 03-26-2007, 07:40 PM #15
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    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.
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