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Thread: My RS50 (sorry its not a sumo!)

  1. #1
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    Default My RS50 (sorry its not a sumo!)

    Well, I wanted to change it up and I certainly did!
    Ive wanted one since they first came out and now I have a super clean example with 1700 miles and its a 2000.

    One problem: power.
    This will wont be my normal ride, but I'll take it out every perfectly nice day, and would like to make that day a little bit more exciting...

    What do you guys suggest as far as small torquey powerplants with around 25-30hp?
    Ive heard really good things about the CRF150R motors, and Im sure its small enough to fit in there.

    pics coming soon
    '99 WR400F(T)
    The T is for Tard!!

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    I would keep it 2 stroke. A 250 smoker would have 45 hp which is probably too much. Maybe a 125 would be better. Although......

    I want to put a 250 in my 150r. If i find someone that can do it my 150r motor will be for sale.

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    Just let me know, a nice high reving 4stroker would be a hoot and I wouldnt have to worry about keeping the oil injection resivour full, but id lose the electric start.


    There are a few 70cc-80cc kits out there, with a pipe, carb and some porting I bet I could get somewhere around 15-20horse. Ive priced everything but the porting out and it came to 800bucks, not bad. And how many two stroke streetbikes are left? not many.
    '99 WR400F(T)
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    I still have a YZ400F bottom end sitting around..that would be interesting.
    '99 WR400F(T)
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    You won't miss the electric start. Those little 150's are really easy to kick.

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    A 150 isn't going to make 30hp, but if you got one and dumped all of the go fast parts into it, it would be plenty of fun IMO. I had a KLX 110 with a 138 or so Two Bros big bore kit and it was awesome on the street for something of that size. I know two bros sells 175cc big bores for the CRF150.
    '03 CRF450R Street Supermoto

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    RS50? As in Aprilia RS50?

    Put a RS125 engine in it They make 30-33bhp when derestricted.

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    A 125 swap would be great, for some reason I thought they were left side drive?

    PICS finally:
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    '99 WR400F(T)
    The T is for Tard!!

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    How about putting a 450 in it? That would give some pep!

    http://www.apriliaforum.com/forums/s...d.php?t=155355
    Last edited by Sekon; 10-03-2010 at 08:59 PM. Reason: added
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    A 450 would be incredible! I do still have a YZ400 bottom end as I mentioned...
    I just took the lil 50 for a spin, its certainly fun!
    It feels like Im riding a toy. Which makes sense as Im only making about 6hp.
    A full kit (under 1000) would double it.

    A 125 would be even better, but this bike is so clean I dont want to cut it up.
    '99 WR400F(T)
    The T is for Tard!!

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    I know I've seen a 450 in the RS50 frame. Don't have any info on it, but I know I saw it.

    Wait, it was for sale months ago on Cycle Trader. Good luck!

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    I have an 09 RS125 with a Polini 154cc kit. It will go 100mph. Its not great on fuel, but everyone comes to chat about it. THere hardly any 2 stroke street bikes any more so its really unique. Most people think its an 750 or 1100. It looks like a full size bike. Everyone is shocked when they find out it will go 100MPH.

    As far as your 50, get a nice 70 or 80cc kit for it. Have it tuned to the max. Spend some money on carbon fibre do dads. It would be a shame to butcher up that bike, its waaay to nice. If you had a basket case with a blown motor then heck ya.

  13. #13
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    Quote Originally Posted by Sekon View Post
    How about putting a 450 in it? That would give some pep!

    http://www.apriliaforum.com/forums/s...d.php?t=155355
    Quote Originally Posted by uberninja View Post
    I know I've seen a 450 in the RS50 frame. Don't have any info on it, but I know I saw it.

    Wait, it was for sale months ago on Cycle Trader. Good luck!
    The link i posted was a old for sale thread of one with a 450 might be the same one.



    Last edited by Sekon; 10-04-2010 at 07:45 PM.
    01 Suzuki TL1000R undergoing mods!
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    Quote Originally Posted by HONDARACER View Post
    As far as your 50, get a nice 70 or 80cc kit for it. Have it tuned to the max. Spend some money on carbon fibre do dads. It would be a shame to butcher up that bike, its waaay to nice. If you had a basket case with a blown motor then heck ya.


    I just spent a stupid amount on dough on EVERYTHING I need to do 85mph!
    This is gonna be fun!
    '99 WR400F(T)
    The T is for Tard!!

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    F' it. Get a CR500 motor for it.

    If you have the balls!

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    I have the balls to ride a CR5 powered one, but I dont have the balls to cut apart a perfectly good machine to do the swap.

    Theres a rolling chassis on NH craigslist for $750, someone should tackle it.
    '99 WR400F(T)
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    The UPS man just dropped off everything but the exhaust! oh man, I cannot wait to dig into this!
    '99 WR400F(T)
    The T is for Tard!!

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    Just remember,these little guys have no cush-drive and small bolts for the chain ring. 150-175cc thumper will be more than fine. The bikes are super light. I swaped out an RS125 USD fork on one of mine. Super stiff. Stock forks are a little flexy for a larger powerplant.

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    Be sure to post up on the AF1 Racing site too. lots of good RS guys there.

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    Default fork swap?!

    Can you tell me more about what is involved on the RS125 fork swap?
    Some USDs would be hot, and probably give me what the stock ones are lacking.
    Do you have a build thread on the AF1 forum? Id like to check yours out.
    '99 WR400F(T)
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  21. #21
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    Sure here ya go...
    http://www.apriliaforum.com/forums/s...ht=rs125+forks

    Real easy job.

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    bikebike, just as a warning Im sending you a message so I can pick your brain about your race setup! thankyou
    '99 WR400F(T)
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    The bigbore kit, clutch springs, reeds, and exhaust are done. The throttle cable is too long so I need to modifty that and I need to make a trip to the hardware store for a hose connector. It was pretty easy going work.

    I still want to put in a150R motor!!!!!!!!!!!!!!!!

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    '99 WR400F(T)
    The T is for Tard!!

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    That would be my advice too...nice 70 kit with a good exhaust and carb will make it a lot more fun.

    I restored a rs50 a couple of years back, here you can find the build topic with pics:

    http://www.apriliaforum.nl/viewtopic.php?t=2832&start=0
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    I found a 250 motor for my 150r but cant really afford to divert funds from my other project. How much would you pay for a 150r motor?

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    Whoa! I love the blacked out job Neo! well done.

    Infant: PM sent.
    '99 WR400F(T)
    The T is for Tard!!

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    keep it 2 stroke. there arent many of those. put an rm250 motor in it.

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    Quote Originally Posted by chuckie View Post
    keep it 2 stroke. there arent many of those. put an rm250 motor in it.

    I guess that the 150Rs only put out around 18hp, I could port the shit out of the 70cc motor I have and have something close to that. It looks like I'll continue mixing my gas.
    '99 WR400F(T)
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    Please keep it two stroke!

    And a modern 125 would be all the HP id dare throw at
    That bolted together cast frame.

  31. #31
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    i would stop playing with porting and big bore kits and sell the motor elec and carb you have and put an rm250 motor in with a rad valve and a modified(for the rs frame) pro circuit pipe with the super light rs chassis that would in my mind feel like a liter sport bike.

  32. #32
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    A 250 would be hilarious/scary, why go with a rm? Is it the prefered two stroke motor?
    Another worry is if the little rear sprocket could handle the power.
    '99 WR400F(T)
    The T is for Tard!!

  33. #33
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    ive just always liked rm's haha.

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    Fair enough!
    I have nearly everything buttoned up. Hopefully the machine will fire up tomorrow.
    If for whatever reason I blow it up, then I'll do an engine swap.
    '99 WR400F(T)
    The T is for Tard!!

  35. #35
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    there is a guy on here that did a cr125 swap into an rs50. let us know how the bike is now that the mods are done!!!!
    Pikes Peak International Hill Climb #123
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    The Bike Runs!
    The whole process was mostly painless. I think I used the wrong 0ring for the exhaust port, the spark plug was loose! I forgot a hose clamp for the top coolant hose and lastly the plug I installed for the oilinjector pump delete is weeping case oil a tiny bit.

    So, I still have those few things to take care of but all I have to say is:
    Hot damn!
    Night and day difference, the machine revs better, puts it down better and just plain sounds healthier. For a second I thought that 10 or so hp was enough but I'll always be looking for more. I'll get it sorted out and just go from there. Today was a good day!
    '99 WR400F(T)
    The T is for Tard!!

  37. #37
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    Quote Originally Posted by hellish100 View Post
    The Bike Runs!
    The whole process was mostly painless. I think I used the wrong 0ring for the exhaust port, the spark plug was loose! I forgot a hose clamp for the top coolant hose and lastly the plug I installed for the oilinjector pump delete is weeping case oil a tiny bit.

    So, I still have those few things to take care of but all I have to say is:
    Hot damn!
    Night and day difference, the machine revs better, puts it down better and just plain sounds healthier. For a second I thought that 10 or so hp was enough but I'll always be looking for more. I'll get it sorted out and just go from there. Today was a good day!
    Yup, every little bit helps on those lil things! In the end you will get used to it and tired but maybe you can start by upgrading the suspension a little while you ride the shit out of it in your quest to make it go boom.

    Then when you flop in your Yamaha Blaster 200cc oil injected air cooled motor with tons of aftermarket upgrades you will be ready.

    If you are like me, you're also a fan of this:

    http://en.wikipedia.org/wiki/Yamaha_YZF-R125

    Shame we can't get things like this.
    Last edited by Guntherkills; 11-16-2010 at 12:42 PM.

  38. #38
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    Its silly! We need those too!

    spark plug torqued, oilpump seal fixed, exhaust o-ring replaced, now just to track down a 50cent hose clamp and I'll be good!!!!!!!!
    '99 WR400F(T)
    The T is for Tard!!

  39. #39
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    Took it out for test run #2.
    No leaks, No surprises.
    I'll heat cycle it one more time, then torque the headbolts once more.
    Then fit the body panels for the last time for a while!

    It feels weird to have a motorcycle that needs nothing.
    '99 WR400F(T)
    The T is for Tard!!

  40. #40
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    top speed? suspension mods planned?
    Pikes Peak International Hill Climb #123
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    No idea on the top speed, I havent put the new sprockets on yet, but Im expecting around 75-80.

    I have a line on a full racebike RS. It needs to be rebuilt but it has a title. I put my current on on CL so I could have funds to pick the other one up. If anyone is interested let me know.
    The racebike is the ONLY reason for me ever wanting to sell my current RS.
    '99 WR400F(T)
    The T is for Tard!!

  42. #42
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    The gf helped me change the front sprocket. We'll see how that does it.
    going from a 12 to a 13t.
    '99 WR400F(T)
    The T is for Tard!!

  43. #43
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    I think you will like.

    In fact if your clutch will take it and first gear starts seem short still you may want to try
    A little more if your doing much of long trips with it.

    I dbout you will lose much with one tooth up.

    Just a better spread of power.

    Report back!

  44. #44
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    Does anyone have a Rm250 motor sitting around that can take measurements of it for me?
    '99 WR400F(T)
    The T is for Tard!!

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    Just thought I would post s'more pics!
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    '99 WR400F(T)
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  46. #46
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    On the hunt for a 125 donor!
    '99 WR400F(T)
    The T is for Tard!!

  47. #47
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    hey i dont know where your located but im in charleston wv and ive got a 95 yz125 motor you can have for $80. (ive never heard it run) dont wanna ship it. but if your close enough to pick it up its yours for $80.

  48. #48
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    Thanks for the offer chuckie, however im up in central massachusetts.

    I cant blame you not wanting to ship it. Motors are HEAVY!


    EDIT: Id make it worth it to ship it though
    Last edited by hellish100; 02-13-2011 at 03:50 PM.
    '99 WR400F(T)
    The T is for Tard!!

  49. #49
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    ill get a shipping quote for it. but ill bet its gonna weigh over 40 pounds

  50. #50
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    just put it in a rubbermaid container and ship it!

    I put a yz125 motor in a YSR years ago......I played Mick Doohan exiting many corners on that thing....and suprised plenty of full sized SS riders as well. Buzzy though.....
    Quote Originally Posted by uberninja View Post
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