Page 1 of 2 12 LastLast
Results 1 to 15 of 21

Thread: Gears lenght moddification in gearbox

  1. #1
    apriliaforum expert levisik's Avatar
    Join Date
    Sep 2014
    Location
    Poland
    Posts
    1,652

    Gears lenght moddification in gearbox

    Hi.

    Inspired by Alan facebook post on VDB gearing and taking occasion that engine is parts now, I decided to moddify my gearbox like VDB gearing.

    As I am no expert in gearboxes, using gearingcommander.com I tried to identify which gear is where. Below picture.

    I think that I will do the same as Alan did:

    1st gear SXV, rest RXV except I think I will leave 5th gear from SXV, because on our tracks 5th gear is not used at all and it is better for some street riding to have longer 5th gear.

    I understand, that I just need to replace pairs of gears with those from RXV gearbox. Please correct me if I am wrong.

    Thanks

    2006 Aprilia SXV 450
    Tuneboy Cable available in Poland

  2. #2
    apriliaforum expert SXVINWA's Avatar
    Join Date
    Feb 2009
    Location
    Tri-Cities, Washington
    Posts
    5,466
    Both of my manuals state SXV first gear to be 30/12.

  3. #3
    apriliaforum expert levisik's Avatar
    Join Date
    Sep 2014
    Location
    Poland
    Posts
    1,652
    you are right - gearingcommander.com have some mistakes - I will notify them

    Thanks for this catch !
    2006 Aprilia SXV 450
    Tuneboy Cable available in Poland

  4. #4
    apriliaforum expert Allen Noland's Avatar
    Join Date
    Nov 2008
    Location
    Mountain Lake Park, MD
    Posts
    4,927
    Quote Originally Posted by SXVINWA View Post
    Both of my manuals state SXV first gear to be 30/12.
    The manuals are wrong rxv primary is 12, sxv is 13.
    Noland Trans-World Cycle
    7 East 1st Ave. Mountain Lake Park, MD 21550 * Phone (301) 616-2034 * e-mail allennoland@yahoo.com
    http://www.facebook.com/NolandTransWorldCycle

  5. #5
    apriliaforum expert SXVINWA's Avatar
    Join Date
    Feb 2009
    Location
    Tri-Cities, Washington
    Posts
    5,466
    What’s the world coming to when you can’t trust Italian manuals?!?!?

    Thanks for the correction, Allen. These two shafts are interchangeable, but the output shafts are not... correct?

  6. #6
    apriliaforum expert Allen Noland's Avatar
    Join Date
    Nov 2008
    Location
    Mountain Lake Park, MD
    Posts
    4,927
    Quote Originally Posted by SXVINWA View Post
    What’s the world coming to when you can’t trust Italian manuals?!?!?

    Thanks for the correction, Allen. These two shafts are interchangeable, but the output shafts are not... correct?
    There's other errors too but I wouldn't have the energy to list them

    The primary shafts are interchangeable (with the matching counter gears), output shafts are not.
    Noland Trans-World Cycle
    7 East 1st Ave. Mountain Lake Park, MD 21550 * Phone (301) 616-2034 * e-mail allennoland@yahoo.com
    http://www.facebook.com/NolandTransWorldCycle

  7. #7
    apriliaforum prov-nov
    Join Date
    Dec 2016
    Location
    Germany
    Posts
    69
    The 5th gear of the sxv is also way to short for a street use. A 6th gear would be a dream

  8. #8
    apriliaforum expert
    Join Date
    Nov 2008
    Location
    Western Australia
    Posts
    1,742
    Quote Originally Posted by Daniel26 View Post
    The 5th gear of the sxv is also way to short for a street use. A 6th gear would be a dream
    So change to final drive ratio with chain and sprockets...

    I run 16/44 and find it can just about hit the limiter at 12,500rpm on flat ground...

    Should be 213kph at the limiter...

  9. #9
    apriliaforum prov-nov
    Join Date
    Dec 2016
    Location
    Germany
    Posts
    69
    The topspeed isn't a problem. But the Revs are quite high at a speed of 100 or 120 km/h.

  10. #10
    apriliaforum Junkie
    Join Date
    Jun 2013
    Location
    Toronto, Canada
    Posts
    263
    Quote Originally Posted by Daniel26 View Post
    The topspeed isn't a problem. But the Revs are quite high at a speed of 100 or 120 km/h.
    You can go up to 17/38

  11. #11
    apriliaforum expert levisik's Avatar
    Join Date
    Sep 2014
    Location
    Poland
    Posts
    1,652
    You dont get it. It is important to have first 4 gears normal sharp and wild and 5th long and calm, to have 4000rpm @100km/h

    Who needsto go 200km/h on naked especially supermoto ?
    2006 Aprilia SXV 450
    Tuneboy Cable available in Poland

  12. #12
    apriliaforum prov-nov
    Join Date
    Dec 2017
    Location
    Chicago, IL
    Posts
    86
    Quote Originally Posted by Relax View Post
    You can go up to 17/38
    isnt eating through the chain guides a real problem then?

    i wonder if anyone has modified or built a custom swingarm that allows more clearance for the chain with the smaller sprockets?

    sorry for going a bit off topic...

  13. #13
    apriliaforum expert
    Join Date
    Nov 2008
    Location
    Western Australia
    Posts
    1,742
    Quote Originally Posted by jcw View Post
    isnt eating through the chain guides a real problem then?

    i wonder if anyone has modified or built a custom swingarm that allows more clearance for the chain with the smaller sprockets?

    sorry for going a bit off topic...
    Yes, I know of a "channelled" swingarm on an RXV Rallye bike...

    Just a case of cutting bit of top of the swingarm and welding a channel in there...

  14. #14
    apriliaforum Junkie
    Join Date
    Jun 2013
    Location
    Toronto, Canada
    Posts
    263
    Quote Originally Posted by levisik View Post
    You dont get it. It is important to have first 4 gears normal sharp and wild and 5th long and calm, to have 4000rpm @100km/h

    Who needsto go 200km/h on naked especially supermoto ?
    If you're replying to my post, note that I said UP TO, and it was in response to Daniel's concern about high revs at 100. I have an RRV with that gearing, so it's no longer a Supermoto. I still have my SXV 450 for sumo.

  15. #15
    apriliaforum Junkie
    Join Date
    Jun 2013
    Location
    Toronto, Canada
    Posts
    263
    Quote Originally Posted by jcw View Post
    isnt eating through the chain guides a real problem then?

    i wonder if anyone has modified or built a custom swingarm that allows more clearance for the chain with the smaller sprockets?

    sorry for going a bit off topic...
    We have the same concern on the Hawk GT's when we jack up the suspension, and some suspect that the chain will "bottom out" when the rollers hit the guard as long as the chain is in good condition. At that point, the rollers should roll along the top of what's left of the guard instead of the plates cutting through it. Of course, nobody is willing to take a chance to find out we are wrong...

Page 1 of 2 12 LastLast

Similar Threads

  1. water in gearbox
    By h1dave in forum RS250
    Replies: 4
    Last Post: 03-17-2008, 11:05 PM
  2. starting in gear with clutch in
    By dirtpeg in forum 2006+ Pegaso Trail / Strada / Factory
    Replies: 4
    Last Post: 01-21-2008, 03:26 PM
  3. Play in gearbox selector shaft
    By Earnie in forum RS125 Euro-archive
    Replies: 0
    Last Post: 10-18-2005, 06:23 PM
  4. Will a Factory on standard gearing power wheelie in 2nd gear then?
    By Daniel in forum RSVR and RSVR Factory (2004-2009)
    Replies: 30
    Last Post: 07-20-2005, 11:08 AM
  5. shim in gearbox .... HELP
    By Redmer Bootsma in forum RS250
    Replies: 7
    Last Post: 06-16-2003, 02:58 PM

Posting Permissions

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