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Thread: Variator, roller weights and contra spring mechanics for dummies! Learn how it works

  1. #46
    apriliaforum expert scootnfast's Avatar
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    Lighter rollers and/or heavier contra spring.
    02' SR Ditech - 03' Mojito Retro - 04' Mojito Custom

    Visit Scootnfast.com for lots of scooter tuning tutorials and information!

    ExTremE ScoOTeRs-
    ModIFied fOr PerFoRManCe!!!

  2. #47
    apriliaforum Member motobruce's Avatar
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    ive got it now and it lacks take off power and power between 25-40 before and after that it goes really well.....so i have to go up hills real slow !......... so still lighter yep? How much lighter should i go? just a little or a few grams?

    Thanx for any answers
    Super-motobruce!

  3. #48
    apriliaforum Member motobruce's Avatar
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    Stock both.

    I took the rollers out lastnight and put a 9mm drill bit through each one to make them lighter (an 8.5 fitted origionaly) and it is deffinatley better but its still slower than a stock nrg between 25 and 40 mph also if you don get a run up to a hill it only goes up it at like 20 because its passed the powerband in 1st and it cant reach the next one as its not untill 40 mph. Do you think if i put a 9.5 through them it would be a bit better?
    Super-motobruce!

  4. #49
    apriliaforum Member motobruce's Avatar
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    Any one????
    Super-motobruce!

  5. #50
    apriliaforum expert williamr's Avatar
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    Hit this forum/thread by accident, but I'm riding a 500 Atlantic which is the first bike I've ever had with non-manual tranmission. Your really good description has cleared up a few queries for me on CVT.

    One minor quibble though - for acceleration, you don't want the engine to be producing its maximum horespower; you need maximum torque, which is usually generated a bit further down the power curve.

    Rob

  6. #51
    apriliaforum newb
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    Cool My rollers finished out...

    Quote Originally Posted by scootnfast
    Lighter rollers and/or heavier contra spring.
    So, after some time researching web, I've found that absolutely perfect site "Scootnfast".
    Maybe I'm a little late, but here in Brazil, Aprilia is no more running business and, poor of us Aprilia owners, we have no more info, neither parts. At present I need either a Shop Manual, or a spare part list to identity my needs and order them to the various sites Scootnfast suggests.
    I would appreciate very much if I can get those papers by the web.

    Best regards,

    Sergio

  7. #52
    apriliaforum expert TiminIndy's Avatar
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    You can get the Shop Manual here:

    http://www.aprilia-center.dk/workshop/info_1.htm

    You can get the owner's manual here:

    http://www.serviceaprilia.com/public/lum/index.asp?

    (They even have this in Portugese and Spanish!)

  8. #53
    apriliaforum Member Saak's Avatar
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    A very informative article mate...

    Bought mine 2nd hand 4 days ago and its great.
    I've owned 11 cars including many heavily modified ones, but this is the first of the motorised two wheel variety

    Cheers from a newbie SR50 DITECH owner in South Australia.
    Current Rides -
    2000 Italjet Dragster 180
    2003 Aprilia SR50 DITECH Gianelli Reverse, 7.0g Malossi Rollers.
    2000 Holden Commodore VT II Wagon ***SOLD***

  9. #54
    apriliaforum newb
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    Quote Originally Posted by TiminIndy
    You can get the Shop Manual here:

    http://www.aprilia-center.dk/workshop/info_1.htm

    You can get the owner's manual here:

    http://www.serviceaprilia.com/public/lum/index.asp?

    (They even have this in Portugese and Spanish!)


    Does anyone have these in english?? I only see these in other languages..

    Aaron

  10. #55
    apriliaforum newb
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    my bike

    can rollers go on any moped

  11. #56
    apriliaforum expert rsaprilia01's Avatar
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    they come in different sizes like 13x16. only one size will fit in a certain variator.

  12. #57
    apriliaforum expert azboy's Avatar
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    The 16x13 rollers fit the Polini and Malossi aftermarket variators, 15x12 will fit stock aprilia variators - do they still make mopeds?

  13. #58
    apriliaforum newb
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    "However my ditech had 11.5 gram roller weights stock. I had to go down to a 6.4 gram roller weight and a red contra spring for it to run good."

    Are all DiTecs stock weights 11.5 gram?

    I have a 51 plate SR50 DiTec (all stock as far as i know but derestricted) but it only does 55mph on a good day when it chooses to start for me, i need to get that fixed but i want to go faster also so it looks like i need to get lighter vario weights and red contra spring.

    All those pics are good showing how it works i didnt know any of it by the way so cheers for them.

  14. #59
    apriliaforum newb
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    I have a SR50 lc 2003 (katana engine)
    Does anyone recommend the best way to tune this for acceleration and take-off without buying a 70cc kit or a gear-up kit. I have a 'leovince zx pipe', 'polini carbon race reeds (0.30mm)' and i think my rollers are around 6.5g, i can't remember exactly as i haven't messed around with them for ages and when i did change them there were no noticeable results. Would changing the clutch springs make any difference or is it best to buy a polini/malossi/hebo clutch. Also what weight rollers could anyone recommend?

  15. #60
    Quote Originally Posted by SR50lc
    I have a SR50 lc 2003 (katana engine)
    Does anyone recommend the best way to tune this for acceleration and take-off without buying a 70cc kit or a gear-up kit. I have a 'leovince zx pipe', 'polini carbon race reeds (0.30mm)' and i think my rollers are around 6.5g, i can't remember exactly as i haven't messed around with them for ages and when i did change them there were no noticeable results. Would changing the clutch springs make any difference or is it best to buy a polini/malossi/hebo clutch. Also what weight rollers could anyone recommend?
    Clutch springs will only setup rpm clutch engagment, no imapct on acceleration. Try 5.5 grams or 5 grams rollers, I think you can gain some good results with these. Be sure that you've done all derestrictions on your SR50.Notice that you lose some top speed building up acceleration.

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