Page 8 of 8 FirstFirst ... 678
Results 106 to 108 of 108

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

  1. #106
    apriliaforum Member
    Join Date
    Dec 2015
    Cambridge, MA
    Ok - i think im understanding...i will probably stick with the touring pipe for now as I'm pretty new to CVT technology..and getting a 2000rpm clutch?...any direction?
    2004 Aprilia Mojito Retro 50cc
    2003 Vespa ET2 50cc
    2001 Triumph TT600

  2. #107
    apriliaforum newb
    Join Date
    Jan 2016
    Las Vegas
    Can anyone answer a question about a clutch for me? I have a 2006 Aprilia SR50 Factory Morini and am looking at clutches , will a 107mm Zuma clutch fit? Dr Pulley HiT 161301

  3. #108
    apriliaforum Member Mike Holland's Avatar
    Join Date
    Sep 2012
    Sydney, Australia
    I have just scanned through this topic, and one very important point is ignored. Page 1 shows the situation when the bike is idling, with the belt down on the shaft in the variator while it is at the top of its movement in the clutch pulley.

    But when I open the transmission of my Vespa GTS300, it isn't like that. There is too much play in the belt and it doesn't ride anywhere near the shaft. So because the belt is too long, I am not getting down to "bottom gear", and am losing on acceleration. Similarly at top speed when the belt is at the top of the variator it does not go right down to the shaft in the clutch pulley. I expect this is the case with all Aprilias that use the Quasar engine, and probably many other makes as well.

    The solution is simply to fit a shorter belt. The GT200 belt does a pretty good job in the Quasar engine, but one could go a bit shorter still. The result is a lower "low gear" and a higher "top gear", gain at both ends, with the midrange doing business as usual. A bit of fiddling with fuzzy washers is required to ensure that the belt can go down almost to the variator shaft without getting wedged between the pulley halves when the variator is tightened up.

    This worked for me, and my GTS300 now regularly does wheelies on take-off.


Page 8 of 8 FirstFirst ... 678

Similar Threads

  1. How will a new contra spring help my de restricted scooter?
    By Scarface in forum Scarabeo 50, SR50, Mojito 50, Rally, Fly 50
    Replies: 5
    Last Post: 07-02-2005, 07:34 AM
  2. roller weight and contra spring
    By tankgunner in forum Scarabeo 50 Ditech, SR 50 Ditech, SR Factory
    Replies: 28
    Last Post: 11-14-2004, 04:32 PM
  3. contra spring roller weight Question......HELP!!!!
    By mojito manini in forum Scarabeo 50, SR50, Mojito 50, Rally, Fly 50
    Replies: 1
    Last Post: 03-06-2004, 09:42 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts