Two Stroke Race Bikes (picture thread)

Discussion in '2 smokers' started by England-Kev, Apr 12, 2012.

  1. Tim McKittrick

    Tim McKittrick Long timer

    Joined:
    Dec 29, 2003
    Oddometer:
    1,907
    Location:
    Wasilla Alaska
    Cranks are my largest spares worry- mine has about 50 miles on it now and I have a serviceable spare, so I've enough for two of our very short seasons at least. There were rumors of them being rebuildable by someone but I haven't found a source yet... It looks like the problem is the inner webs have the crank pin cast into them, so the entire wheel would have to be remade to service the pin were it worn past spec. At least they last a little longer than the TZ units

    Piston, rings and wrist pins are available aftermarket, and most of the gaskets and minor engine internals can be made or repaired if NOS isn't available. But the cranks.... they are vanishing and getting ever more expensive.

    [​IMG]
    #21
  2. JBSmith

    JBSmith Ink-stained wretch

    Joined:
    Dec 29, 2003
    Oddometer:
    1,947
    Location:
    Southern Oregon coast
    I rode an ex-Roberts one on the track once (see my avatar pic) and I just can't imagine riding one on the street. For one thing, it had a turning radius of an entire ZIP code.
    #22
  3. PJay

    PJay Any bike, anywhere

    Joined:
    May 24, 2007
    Oddometer:
    1,007
    Location:
    Russell, New Zealand
    Hmmm, I always thought they turned in rather sweetly; but, no, I never tried parking 'em on public streets. They do love long straights where they can wind out, and long sweeping corners suit them better than hairpins, true.

    You read in magazines that they were/are "beasts" and "fearsome"; but that's rubbish. A standard TZ750 is a lovely pussycat to ride.
    #23
  4. JBSmith

    JBSmith Ink-stained wretch

    Joined:
    Dec 29, 2003
    Oddometer:
    1,947
    Location:
    Southern Oregon coast
    They do turn into a corner nicely--on the track. But I'd pay money to watch someone try to do a U-turn with one on a two lane road. I'd bring lunch and a chair, too, because we'd be there all afternoon.

    I turned a TZ250 into a streetbike once. Only thing I couldn't change was the steering lock-to-lock. I had to plan every ride ahead of time to exclude sharp turns.
    #24
  5. PJay

    PJay Any bike, anywhere

    Joined:
    May 24, 2007
    Oddometer:
    1,007
    Location:
    Russell, New Zealand
    As a matter of fact, my experience differs. We used to run race bikes in on 2-lane streets, including both the TZ750s in the picture post above. Even Monoca would turn, feet up, in the 2 lanes of an urban street with parked cars on each side of the street. (Just needed to to turn the steering damper right down.)

    I'd be happy to take your money, but I'd provide the chair and lunch - though I guess travel down here would be a bit tedious for you for that purpose alone.
    #25
  6. JBSmith

    JBSmith Ink-stained wretch

    Joined:
    Dec 29, 2003
    Oddometer:
    1,947
    Location:
    Southern Oregon coast
    I'd be happy to be proven wrong about the steering lock, since NZ is on my must-see-before-I-die list. Don't be surprised if there's a knock on your door someday and there's a old, fat Yank with a suitcase. :D
    #26
  7. ADV8

    ADV8 Taumarunui..Darwin..

    Joined:
    Nov 10, 2007
    Oddometer:
    2,385
    Location:
    North of Sydney.
    That was in reply to Viv's query to Bendernz's Puke picture.

    Of course that is not Sayle and Hansford at Puke although I saw both there in the late 1970's.

    Don't panic this is not Meremere. :lol3

    [​IMG]
    #27
  8. ADV8

    ADV8 Taumarunui..Darwin..

    Joined:
    Nov 10, 2007
    Oddometer:
    2,385
    Location:
    North of Sydney.
    There's a name I havn't seen since the Kawasaki triples forum. :thumb
    #28
  9. PJay

    PJay Any bike, anywhere

    Joined:
    May 24, 2007
    Oddometer:
    1,007
    Location:
    Russell, New Zealand
    Look forward to it, bro. PM me before you book accommodation.
    #29
  10. MCmad

    MCmad Banned

    Joined:
    Jun 29, 2008
    Oddometer:
    7,842
    Yep thats what those 350s were like have a test and dyno run of one and they said it was a light switch, will go dig it out if you wish
    #30
  11. PJay

    PJay Any bike, anywhere

    Joined:
    May 24, 2007
    Oddometer:
    1,007
    Location:
    Russell, New Zealand
    No need, have one of my old TZ350s still, raced them for many years.

    The standard TZ750s have reed valves to spread the power and smooth it out a bit; 250s and 350s of that era don't.
    #31
  12. MCmad

    MCmad Banned

    Joined:
    Jun 29, 2008
    Oddometer:
    7,842
    light switch ?
    #32
  13. slideways

    slideways permanent ex-pat

    Joined:
    Mar 1, 2003
    Oddometer:
    7,299
    Location:
    The Bahamas Mon.
    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
    #33
  14. PJay

    PJay Any bike, anywhere

    Joined:
    May 24, 2007
    Oddometer:
    1,007
    Location:
    Russell, New Zealand
    Not really, but a big step at 8 or 9,000rpm, depending on what you've done with porting, jetting and timing.

    (TZ race start technique: hold it at 8,000 on the line, lights or flag go, slip clutch until the bike's moving a little, then immediately just dump the clutch. Slipping the clutch burns it out, but lots of people try to hold 'em at 6 and slip: slow starts and clutch burning results.)
    #34
  15. pdxjim

    pdxjim Two Stroke Terror

    Joined:
    Sep 14, 2009
    Oddometer:
    175
    Location:
    Portland, OR
    Is that you Les?
    #35
  16. ADV8

    ADV8 Taumarunui..Darwin..

    Joined:
    Nov 10, 2007
    Oddometer:
    2,385
    Location:
    North of Sydney.
    Indeed it is Jim. :lol3
    #36
  17. Donzzilla

    Donzzilla Been here awhile

    Joined:
    Nov 4, 2008
    Oddometer:
    420
    Location:
    Brackney,PA
    Taking the Knick Bultaco out for a shakedown run after a year long build, PRICELESS!

    <a href="http://www.flickr.com/photos/donzzilla/6968310136/" title="11DonOnPete'sBul by donzzilla, on Flickr"><img src="http://farm6.staticflickr.com/5152/6968310136_db06541d19_o.jpg" width="1519" height="1011" alt="11DonOnPete'sBul"></a>
    #37
  18. dirt_bloke

    dirt_bloke Triumph Tiger. Because Resistance is Useless.

    Joined:
    Jan 24, 2007
    Oddometer:
    1,290
    Location:
    Wide Bay, Queensland, Australia
    Many lifetimes ago,
    [​IMG]
    [​IMG]
    [​IMG]
    #38
  19. gplracing

    gplracing Adventurer

    Joined:
    Jan 24, 2012
    Oddometer:
    29
    Location:
    Nova Scotia Canada
    A little TZR 250 1kt I just finished for a guy. Full tune and a set of pipe to match that tune.

    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]

    Glyn
    #39
  20. gplracing

    gplracing Adventurer

    Joined:
    Jan 24, 2012
    Oddometer:
    29
    Location:
    Nova Scotia Canada
    This years race effort from Gpl racing in Nova Scotia.

    A local rider that I could not sponcer with money, but was willing to supply him with tuned barrels, head and pipes. I've really enjoyed the time at the track setting it up and seeing him fly down the straight.

    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]

    Glyn
    #40