new sherpa rider

Discussion in 'Trials' started by neanderthaler, Nov 18, 2012.

  1. neanderthaler

    neanderthaler Been here awhile

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    thanks for the info sting. i'm gonna count the teeth and see if i can find the stock number of teeth in 1973. i have no idea what a vintage trials bike should "feel" like, so i don't know if i'm geared right or wrong. obviously, it feels massively different than my enduro or mx bikes.
    #21
  2. PSchrauber

    PSchrauber Been here awhile

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    As the bike is build in 1973 as you said, the bike should be a model 92.
    For this model there is a ratio given of: 3,71.
    (works specification for the secondary drive)

    This would be: 14 front and 52 rear.
    #22
  3. GarageRat

    GarageRat Been here awhile

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    Great looking Bul! What's the orange site? (Sorry)
    #23
  4. neanderthaler

    neanderthaler Been here awhile

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    don't know if this site wants me to mention other forums, but i was talking about ktmtalk. if the mods want to remove this post, i won't be offended.
    #24
  5. neanderthaler

    neanderthaler Been here awhile

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    wow - i took the bike out to a really small local spot where there is a small but abrupt grass drainage ditch lined with a few trees behind some nearby houses. remember this is my first time on a trials bike. i've been street and dirt riding for about 20 years and have been racing hare scrambles for a few years now on a ktm 200xc. i have raced a few races on older post vintage/evolution class bikes, also, but my little 20 or 30 minutes on the bultaco was a true workout! i'm beat! what a fun time, and a true test of skills. i have nobody local to follow around and the only spot i've seen other trials bikes at is about 3 hours away, so it was just my son and i out there "goofing around." i hope i'm not making any bad habits before i learn some proper technique. i know there is a video out about classic trials techniques that i should probably look into. for now, all i've used for motivation is vintage trials youtube videos. until today, i had only practiced turning and figure 8's within one lane of the street in front of my house and balancing with the bike off, front wheel lightly against my truck bumper. what a complete difference it was just on the few feet of up and down in the little ditch area. i thought i was getting good at tight circles until i tried to do them at an angle, or with sand/grass/roots below the tires! i knew i had to work on my fitness before i started, and i wasn't wrong. last week i contacted the most local trials organization and made some arrangements to come out and compete. unfortunately, the president told me that there wasn't enough interest in vintage bikes to have a stand alone class, but there are a few guys through the different classes riding vintage bikes and doing well on them. basically, he invited me to come out and have some fun, and that is what i intend to do. until then, i'm going to work on any skills that i can pick up, and try to soak up some knowledge from you guys and ladies. any input and advice is always welcomed - thanks in advance
    #25
  6. neanderthaler

    neanderthaler Been here awhile

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    i finally got off my butt and picked up a kill switch. the switch has two wires and i'm assuming they go to the terminal block under the gas tank. using the schematic patrik supplied on page 1 of this thread, it looks like the kill switch is only 1 wire, so, as usual, i'm confused
    HELP
    can someone tell me where to connect the 2 kill switch wires - thanks in advance
    #26
  7. JRAM

    JRAM sherpa

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    Mar 8, 2007
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    Minnesota
    Splice one wire to the black wire under the tank- usually there is enough room to slide it into the terminal with the black wire coming from the engine, then connect the other wire to the frame or suitable ground. This is assuming it is a spring loaded switch you push and hold down to kill the engine. Hope this helps.
    #27
  8. neanderthaler

    neanderthaler Been here awhile

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    it does help, immensely. hope to get it done tonight. thanks
    #28
  9. Sting32

    Sting32 Trials Evangelist

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    THis is a switch that "grounds" whatever it is connected to, back through the second wire instead of to the handlbars... Handlbars with paint didnt ground very well, in fact it was not uncommon to get shocked, if painted bars, or if the killswitch itself was loosened or anything (not getting good ground). Thus the 2 wire one is just better than single wire ones.

    So one lead is bolted to ground, the other should be hooked to (as explained above) to that block, were the leads come from the points/side case, if I recall correctly. follow your instructions given by others or the diagram, you will be glad you did the 2 wire version of killswitch
    #29
  10. neanderthaler

    neanderthaler Been here awhile

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    thank you to jram and sting.
    #30
  11. neanderthaler

    neanderthaler Been here awhile

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    so i wired the 2 wire kill switch in, one side to ground, the other to the black wire at the terminal block (smaller gauge black wire side so it would fit under the screw easier). also, while i had the tank off (wouldn't it be nice if that crossover tube had shut-offs and quick disconnects) i replaced the throttle and throttle cable. got it all back together, start it up, kill switch shuts the bike down perfectly. to celebrate my success, i drop it into gear, let the clutch out a bit and, much to my suprise, i'm pulling BACKWARDS! this can't be right. try again. checked to make sure the throttle isn't wired in reverse (joke :rofl). take the tank back off, removed the kill switch wire from the smaller black wire side and install it on the larger gauge black wire side (much harder to get 2 wires into that tiny terminal). put everything back together again, starts right up, goes FORWARD in gear now, shuts down when i hit the new kill switch. thanks again fellas :clap
    #31
  12. PSchrauber

    PSchrauber Been here awhile

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    Running backwards is not unkommen for a Bultaco Sherpa.

    You can force the engine to start backwards by rolling backwards down a slope with third gear engaged but pulling clutch, then release the clutch when you have picked up some speed and now the engine + bike will run backwards.

    But the engine does sound strange and I don't think it's very healthy and I would not recommend to do this for a longer time. Nevertheless, at age 16-17 I did this regulary with my Bultaco Sherpa 175cc.
    #32
  13. lamotovita

    lamotovita Ageing Adventurer

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    I don't think your wiring had anything to do with the backwards running. If you check and adjust the ignition timing a little it will probably take care of the issue.
    #33
  14. neanderthaler

    neanderthaler Been here awhile

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    i don't know how either, but when i changed the wires where i described, it ran properly. i am not gonna boggle my mind to try and figure it out. i'm just relieved it works as it should. it was amusing, but not something I'd like to repeat
    #34
  15. PSchrauber

    PSchrauber Been here awhile

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    #35
  16. neanderthaler

    neanderthaler Been here awhile

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    just lucky then. i wasted an extra 10min playing with wires.
    #36
  17. Sting32

    Sting32 Trials Evangelist

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    If you play with the timing, you can have a "lotto" on which way it starts after a
    kick... problem is, if you do what I have had happen, the bike can stall and
    instantaneously restart in reverse on a hill, or bumping up against something...
    :eek1
    #37
  18. neanderthaler

    neanderthaler Been here awhile

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    wow. that sounds horrible. are you guys trying to scare me off :D? although, now that i think about it, one of the 4st honda tl's would be nice
    #38
  19. PSchrauber

    PSchrauber Been here awhile

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    Isn't, it can happen accidently but as mentioned does not happen "all the time". I believe it has to do with the very forwarded timing you have and the fact that the engine is an ultra short stroke which makes reverse spinning very easy.
    #39
  20. norton73

    norton73 drinkin'

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    :rofl


    I regularly ride both left and right shift bikes, but my Sherpa has the pattern reversed from my Norton and Ducati.

    while going up a hill a while back, I went to down shift, but when I let out the clutch, I discovered I had upshifted. I immediatly pulled in the clutch, downshifted twice, grabbed a handful of throttle as my speed was almost gone, and launched over the bars when the bike went backwards :rofl
    #40