The building of my vintage racer

Discussion in 'Airheads' started by FreeTheBeast, Apr 24, 2012.

  1. noman

    noman Long timer

    Joined:
    Jun 4, 2007
    Oddometer:
    1,234
    Location:
    castleton, vt
    i don't know anything about jacking a motor while moving it forward, but marcus does (pic on page 2). we were yakking about his bike at the okemo event (nice build btw) and he mentioned swapping out the driveshaft from a different model for a specific reason that i forget now.

    i'll be seeing him and the gang saturday, more racing.
  2. FreeTheBeast

    FreeTheBeast Shunpiker

    Joined:
    Jan 23, 2004
    Oddometer:
    3,077
    Location:
    +1.603
    Marcus likes to use a later model swing arm. It's bigger. USCRA doesn't allow swing arm bracing. A later swing arm provides more robustness without using a brace.

    I bought most of my bike from Marcus. He has many suggestions. Some of them good ones. :D He does prefer the RaceLine kit. He will be at Okemo this weekend, as will I.
  3. supershaft

    supershaft because I can

    Joined:
    Sep 9, 2010
    Oddometer:
    9,116
    Location:
    San Francisco Bay area
    Our engines are stressed members just like K engines or Ducati engines. I would weld my raised engine mounts and stress the engine properly. You move the engine forward by making an aluminum spacer between the drive shaft and the tranny. Why? To move the weight bias forward. Just raising the engine moves it reward slightly. That they do not need. The spacer is pretty easy to make and you can keep the pivot point and the drive shaft real close to where it is originally. Then you run the drive shaft dry. I have worked on race bikes thusly set up with tons of track time no problem.
  4. FreeTheBeast

    FreeTheBeast Shunpiker

    Joined:
    Jan 23, 2004
    Oddometer:
    3,077
    Location:
    +1.603
  5. Voltaire

    Voltaire Bored Of The Rings

    Joined:
    Jun 4, 2011
    Oddometer:
    1,965
    Location:
    Auckland,New Zealand
  6. mykill

    mykill odd

    Joined:
    Feb 6, 2008
    Oddometer:
    1,179
    Location:
    Los Angeles
    I have the lift kit from Motoren Israel. You do have to drill your case for a rather large time-sert, but the frame remains unaltered. The engine ends up lifted, tilted and a bit forward but does not affect the driveshaft mating. It is a compromise but an effective one. Ultimately I think would like to alter my frame for lifting and moving the engine forward with a spacer between the driveshaft and tranny because the bike is ass heavy and may be better balanced with this fix.The oil filter cover gets blocked by the frame, so oil filter changes are a PITA, spin on kit is a good fix. Sorry, no image of the OF side, but you may get the idea.
    [​IMG]
    The hot ticket for a swing arm for roadrace purposes would be the R65 S/A. Same length as a SWB but beefier.
  7. mykill

    mykill odd

    Joined:
    Feb 6, 2008
    Oddometer:
    1,179
    Location:
    Los Angeles
    I guess I did have an image.
    [​IMG]
  8. FreeTheBeast

    FreeTheBeast Shunpiker

    Joined:
    Jan 23, 2004
    Oddometer:
    3,077
    Location:
    +1.603
    Thanks for those...

  9. Padmei

    Padmei enamoured

    Joined:
    Mar 12, 2008
    Oddometer:
    4,087
    Location:
    Nelson New Zealand
    Wow a great modification. There must be a bit of internal socery for that to work.
  10. Kai Ju

    Kai Ju Long timer

    Joined:
    Jul 29, 2009
    Oddometer:
    2,071
    Location:
    So Cal
    The internal sorcery is in the spacer ring.
  11. Padmei

    Padmei enamoured

    Joined:
    Mar 12, 2008
    Oddometer:
    4,087
    Location:
    Nelson New Zealand
    Yeah I figured that but there must be some pipes redirected wouldn't there? Got any pics?
  12. Kai Ju

    Kai Ju Long timer

    Joined:
    Jul 29, 2009
    Oddometer:
    2,071
    Location:
    So Cal
  13. Voltaire

    Voltaire Bored Of The Rings

    Joined:
    Jun 4, 2011
    Oddometer:
    1,965
    Location:
    Auckland,New Zealand
  14. Boxer Metal

    Boxer Metal Mad Scientist

    Joined:
    Nov 3, 2003
    Oddometer:
    3,608
    Location:
    Chico, California
    If they 79-80 driveshafts are the non dampened type I would look for one of those. I couldn't tell from the online parts finders.
  15. Padmei

    Padmei enamoured

    Joined:
    Mar 12, 2008
    Oddometer:
    4,087
    Location:
    Nelson New Zealand
  16. mykill

    mykill odd

    Joined:
    Feb 6, 2008
    Oddometer:
    1,179
    Location:
    Los Angeles
    You first remove the filter canister. Fitting the spacer is a fiddly affair, but once in place you wonder why it was difficult.
  17. Voltaire

    Voltaire Bored Of The Rings

    Joined:
    Jun 4, 2011
    Oddometer:
    1,965
    Location:
    Auckland,New Zealand
    Are you up and running again? What was wrong with the motor?:huh
  18. birdman

    birdman No registered bikes

    Joined:
    Sep 28, 2007
    Oddometer:
    124
    Location:
    Wakefield, NH
    Not a true statement. Maybe Marcus was thinking about other SPEC classes. Bracing is allowed in all of the classes that you run with in the USCRA. I run the big tube swingarm on my 750 and an unbraced SWB SA on my 500 for what its worth. My 500 is lifted, pushed forward about an 1" (using a driveshaft spacer) and has a brace/mount from the backbone to the starter holes, truely a stressed engine. From my understanding the SA bracing was only needed for the LWB small tube models as they were prone to flexing when pushed.

    I still have an unused RACELINE engine lift kit.
  19. Voltaire

    Voltaire Bored Of The Rings

    Joined:
    Jun 4, 2011
    Oddometer:
    1,965
    Location:
    Auckland,New Zealand
    I'd be interested to hear a bit more on your 500 as I'm building one at the moment.:ear speed, tweeks opposition etc...
  20. FreeTheBeast

    FreeTheBeast Shunpiker

    Joined:
    Jan 23, 2004
    Oddometer:
    3,077
    Location:
    +1.603
    Upon further review, there is nothing in the rules book that mentions swing arm bracing. You're right, Jeff.

    So...........what are you suggesting about your *spare* Raceline kit? ;~)

    Will see you at the endurance race weekend, right?