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Thread: The RMV125 - CR125 Conversion for 99-05 RS50

  1. #1096
    apriliaforum Junkie chadzilla1's Avatar
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    what ever did you do with your derbi?

    Quote Originally Posted by asechrest View Post
    Tampa to Tallahassee. Bike runs and shifts. Needs some cleaning and it's been down on the left side but not bad. Currently on the search for a donor CR125. The AM6 from this one will go up for sale after a carb clean and compression test.
    1999 RS 50


    Stock engine, stock pipe, giannelli can


    Dellorto PHBG 17mm AS carburetor
    atomizer = 262 AU
    main jet = 86
    idle jet = 52
    starter jet = 60
    float = gr .4
    needle = W7
    slide = 40

  2. #1097
    apriliaforum Member asechrest's Avatar
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    Quote Originally Posted by chadzilla1 View Post
    what ever did you do with your derbi?
    Still have it. Will probably put it up for sale to help fund this project. I also own a boat, so I need two bikes like I need another hole in the head.
    2002 Aprilia RS50 - RMV125 in progress
    2002 Derbi GPR 50 - EBE075 Engine

  3. #1098
    apriliaforum prov-nov Dextroyer's Avatar
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    Oh man now it is a race to see who gets their RMV finished first!

  4. #1099
    apriliaforum Member asechrest's Avatar
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    Quote Originally Posted by Dextroyer View Post
    Oh man now it is a race to see who gets their RMV finished first!
    You may win! I don't have a donor CR125 yet.

    But I am looking forward to track days with 4+ RMVs!
    2002 Aprilia RS50 - RMV125 in progress
    2002 Derbi GPR 50 - EBE075 Engine

  5. #1100
    apriliaforum prov-nov Dextroyer's Avatar
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    Oh man that is gonna be the day! Maybe I can convince Rich from Corsa Motorworks to bring out his YZ125 powered RS50 roadbike too? He just picked up another roller and is undecided whether it will be get another YZ motor or an AM6. I would love to see a whole grid of these things. That bike you just scooped up looks great! I guess I should start a thread for my build on here since I am going slightly different of a route with it.
    2017 Aprilia RSV4 RR - Road
    2018 Honda Grom - Race
    2003 Aprilia RS50/RS4/RMV125 - WIP

  6. #1101
    apriliaforum Member asechrest's Avatar
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    Quote Originally Posted by Dextroyer View Post
    Oh man that is gonna be the day! Maybe I can convince Rich from Corsa Motorworks to bring out his YZ125 powered RS50 roadbike too? He just picked up another roller and is undecided whether it will be get another YZ motor or an AM6. I would love to see a whole grid of these things. That bike you just scooped up looks great! I guess I should start a thread for my build on here since I am going slightly different of a route with it.
    Looking forward to following your build thread. Once I've got my donor motor I'll start one as well.
    2002 Aprilia RS50 - RMV125 in progress
    2002 Derbi GPR 50 - EBE075 Engine

  7. #1102
    apriliaforum expert mattology's Avatar
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    more fun on track...

    day ended with my o2 sensor cracking off, so i had to weld that back up. lol

    i'm trying to get better ergonomics on the bike so i have moved the pegs forward in the rearsets, and added some hydrofoam to the tank a la jorge lorenzo to try and make locking my knee in and hanging off the bike easier.

    we will see...


    Get your confidence back with Aprilia.

    caution: the use of motorcycles may be habit forming. side effects include purchasing multiple examples of the same bike, in different states of tune, different years, or different models altogether. some motorcycles may be not running when purchased. some parts are no longer available. there are rare instances where aprilias are bought over the internet and upon arrival, they are not as were originally disclosed. there is a small group of people who cannot handle two stroke engines and motorcycle maintenance. if this is the case, you may not be a candidate for Aprilia RS250's.

    Aprilia. Ask your doctor if the RS250 is right for you.

  8. #1103
    apriliaforum prov-nov Dextroyer's Avatar
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    2017 Aprilia RSV4 RR - Road
    2018 Honda Grom - Race
    2003 Aprilia RS50/RS4/RMV125 - WIP

  9. #1104
    apriliaforum expert twinturba's Avatar
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    looks like fun!
    Jenius Biker Blog

    Current: RS250³,Newd, TT, Max, Nastro, Bangkok, 85 ADV

    Past:Versys, Typhoon, NCXD, RC390², Madass, PW50, KTM BR 65, Aprilia BR50, Aprilia RS125², DRD, WR250X, Derbi SM⁷, Aprilia RS50¹⁰, Derbi GPR³, Aprilia RS250², Mito², NSR50², NS50, HRC RS125, HRC RS80, YSR63 (1st 2stroke!), FZ600, KLR250(1st Bike!)

    I Need Parts!

  10. #1105
    apriliaforum expert mattology's Avatar
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    Sweet thanks for the pics!

    Get your confidence back with Aprilia.

    caution: the use of motorcycles may be habit forming. side effects include purchasing multiple examples of the same bike, in different states of tune, different years, or different models altogether. some motorcycles may be not running when purchased. some parts are no longer available. there are rare instances where aprilias are bought over the internet and upon arrival, they are not as were originally disclosed. there is a small group of people who cannot handle two stroke engines and motorcycle maintenance. if this is the case, you may not be a candidate for Aprilia RS250's.

    Aprilia. Ask your doctor if the RS250 is right for you.

  11. #1106
    apriliaforum Junkie freedomgli's Avatar
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    Love seeing the two bikes cutting it up and the last pic wheelie-ing past the photog. Great shots!

  12. #1107
    apriliaforum expert mattology's Avatar
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    yeah, with short track gearing they power wheelie in first very easily! lol. the front wheel can even come off the ground coming over the bridge sometimes..

    Get your confidence back with Aprilia.

    caution: the use of motorcycles may be habit forming. side effects include purchasing multiple examples of the same bike, in different states of tune, different years, or different models altogether. some motorcycles may be not running when purchased. some parts are no longer available. there are rare instances where aprilias are bought over the internet and upon arrival, they are not as were originally disclosed. there is a small group of people who cannot handle two stroke engines and motorcycle maintenance. if this is the case, you may not be a candidate for Aprilia RS250's.

    Aprilia. Ask your doctor if the RS250 is right for you.

  13. #1108
    apriliaforum expert mattology's Avatar
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    so as i mentioned briefly above, i need to improve my body positioning on the bike and one thought i have had is that my current peg sliders were causing me issues



    that delrin spacer / knob on the end was causing my boot to slip whenever i was on the end of it. so that's horrible for when you need that security in order to brace yourself on the bike by your legs and hips and feet.. so off it goes, along with moving the pegs forward to get my knee and leg more into the tank easier.



    i then printed up a new design peg slider, that mounts to one of the other lower farther back rearset holes, and comes out farther. this is out of carbon fiber reinforced nylon.




    when laying the bike over, the pegs nor shift pedal doesn't touch, and neither do the sliders. ( the bar sliders, axle sliders, and spool sliders all touch however)




    just in case, however, the sliders are on there. they're required for the local kart track i run at.


    here is the hydro turf i added to the tank so far, although i may add more.



    Get your confidence back with Aprilia.

    caution: the use of motorcycles may be habit forming. side effects include purchasing multiple examples of the same bike, in different states of tune, different years, or different models altogether. some motorcycles may be not running when purchased. some parts are no longer available. there are rare instances where aprilias are bought over the internet and upon arrival, they are not as were originally disclosed. there is a small group of people who cannot handle two stroke engines and motorcycle maintenance. if this is the case, you may not be a candidate for Aprilia RS250's.

    Aprilia. Ask your doctor if the RS250 is right for you.

  14. #1109
    apriliaforum prov-nov Dextroyer's Avatar
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    Those peg sliders look neat! I bought a roll of 1/4in neoprene to do my race seat with. I think it could work as tank grips as well. I will have plenty extra.
    2017 Aprilia RSV4 RR - Road
    2018 Honda Grom - Race
    2003 Aprilia RS50/RS4/RMV125 - WIP

  15. #1110
    apriliaforum expert mattology's Avatar
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    new pipe developments ....

    Get your confidence back with Aprilia.

    caution: the use of motorcycles may be habit forming. side effects include purchasing multiple examples of the same bike, in different states of tune, different years, or different models altogether. some motorcycles may be not running when purchased. some parts are no longer available. there are rare instances where aprilias are bought over the internet and upon arrival, they are not as were originally disclosed. there is a small group of people who cannot handle two stroke engines and motorcycle maintenance. if this is the case, you may not be a candidate for Aprilia RS250's.

    Aprilia. Ask your doctor if the RS250 is right for you.

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