85 Beta TR33 New bike and need help

Discussion in 'Trials' started by GAwoody83, May 12, 2013.

  1. GAwoody83

    GAwoody83 Been here awhile

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    hey guys, I just came across a 85 Beta TR33 and I need some help. The guy I bought it from new very little about the bike and said it had just been sitting for a few years. My dad and I put in some new gas and she fired right up. We rode it around for a while and put her up. Does any one know what the gas mixture is supposed to be? I have heard anywhere from 40:1 to 100:1 on various forums. This is my first trials bike and I am not really doing much with it now besides trying to find my balance points. Thanks guys!

    the bike:

    [​IMG]

    My dad rockin it! :evil

    [​IMG]
    #1
  2. lineaway

    lineaway Long timer

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    40-50 with a good oil. Just hate to see problems now. Nice looking for that old of Beta. ITSA has just started a mono class this year!:clap
    #2
  3. Sting32

    Sting32 Trials Evangelist

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    50:1 is fine for air cooled "trials only" type riding with good synthetic 2stroke oil.

    Riding like enduro/trail riding I would opt for 40:1 which was posted above me... just because harrd ro find parts, imho.

    Sent from my SCH-I535 using Tapatalk 2
    #3
  4. joe cool

    joe cool Been here awhile

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    Nice pic of your Dad getting the front wheel up:clap and yes 50-1 on the oil.
    Enjoy!
    #4
  5. Twin-shocker

    Twin-shocker Long timer

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    You can use whatever fuel/oil mix you want for trials, as motors are very low heat, and as long as you use a good fully synthetic PRE MIX ONLY oil, you wont have any problems.

    However if you choose to use excessive amounts of oil, your bike wont run as well as using the correct amount, and if you choose to service the exhaust system it will very quickly become clogged again.

    70-80:1 is fine for all air cooled trials bikes, with the proviso that you must use fully synthetic PRE MIX ONLY 2t oil.
    #5
  6. GAwoody83

    GAwoody83 Been here awhile

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    Thanks guys, my dad is fascinate by the bike, he is looking into the trials training centers instruction courses and watching instructional videos all the time. He had a blast on the bike and it was his first time on anything besides his royal star in almost 15 years, by the way he is 69 years old with a new hip and soon to have new knees.
    #6
  7. wb22rules

    wb22rules Bourbon Tester

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    Fathers day gift suggestion:
    Good riding gear and a good helmet, he looks as if he is fearless on that thing, could be problematic without some good gear :D
    #7
  8. ADVCoop

    ADVCoop Been here awhile

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    That wheelie pic is awesome!
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  9. Brewtus

    Brewtus Buffoonery, Inc.

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    +1 :thumb
    #9
  10. GAwoody83

    GAwoody83 Been here awhile

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    Does anyone know what the correct spark plug for this bike should be or where I could find another coil?
    #10
  11. lineaway

    lineaway Long timer

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    I`ve always ran a ngk bp5es, but I think a seven was stock. Also I have never seen a coil replaced. What happened?
    #11
  12. GAwoody83

    GAwoody83 Been here awhile

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    Just curious, would like to gather as many parts as I can get. What gap should I set the plugs to?
    #12
  13. Monty348

    Monty348 Adventurer

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  14. GAwoody83

    GAwoody83 Been here awhile

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    If I were to run this bike in any events, what class would I be in? Obviously in a amateur class, but I know ITSA has the new class but i have front disc brake so I am left to run with the new bikes right?

    Also, what are the differences between this and the newer bikes? Frame, better suspension, rake of front end?

    What was a trials course like in 85 era?
    #14
  15. lineaway

    lineaway Long timer

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    Actually ITSA does have a vintage mono class that just started this year. Not too many riding it yet. They consider the disc on the original monos not really better than drums of the period.
    #15
  16. Monty348

    Monty348 Adventurer

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    Looks to me like your bike would qualify for the Modern Mono class.

    http://twinshock.org/content.aspx?page_id=22&club_id=922050&module_id=10801
    o Modern Mono Any mono-shock trial motorcycle from any time period utilizing disc brakes on one or both wheels.

    Trials bikes evolved yearly in the 1980's with changes every year based on the previous year's factory professional model. For the most part that pattern hasn't changed. Improvements are small but over time add up significantly.
    #16
  17. lineaway

    lineaway Long timer

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    A. The International Twin Shock Association (ITSA), our governing body, is introducing a new class
    for 2013, which will be: AIR COOLED MONO. Mt. West Vintage Trials Association (MWVTA) will
    allow any air cooled mono-shock machine up to model year 1991, with either drum or disc
    brakes. This class will be further subdivided into Expert, Intermediate and Novice

    It looks like our club has it`s own definition of the Mono class!
    #17
  18. Gordo83

    Gordo83 Been here awhile

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    I had an 86 TR33. I rode my very first real Trials event on it a few years ago, before I switched to the Vintage bikes. The bike was great, but I would agree with lineway, the front disc brake didn't work well. I have an 85 TY350 that stops better. But I do like the Beta. Keep an eye on ebay. There's always parts coming up for it.
    #18
  19. Twin-shocker

    Twin-shocker Long timer

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    On most Euro trials bikes fitted with twin piston brake calipers, its possible to fit quad piston type from later bikes as direct replacement.
    The master cylinder may be needed as well, and these changes will mean a better brake. Main problem with the older bikes though, is than many of them dont have floating discs, which seems to mean that brakes dont work quite as well as more modern bikes, even after changing caliper and master cylinder.
    #19
  20. lineaway

    lineaway Long timer

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    And then it will not be legal in the vintage class.
    #20