1993 Beta Synt Zero need information, help, advice probably parts

Discussion in 'Trials' started by Mini Trail, Jun 6, 2018.

  1. Mini Trail

    Mini Trail n°°b

    Joined:
    Jun 27, 2007
    Oddometer:
    2,422
    Location:
    West Tennessee
    I recently bought a 1993 Beta Synt that I am dying to ride but haven't had a lot of time to sort out. I have just started to try to get it going but I am a bit lost on it. There are so many threads on so many forums about air cooled, twin shock, electric and modern trials bikes but this era and brand doesn't seem to get much love. From what I can tell, the Synt (short for synthesis) is the steel framed version of the ZERO. The bike hasn't been ridden since about 2012 but it is complete.

    First of all, is there a centralized specialist in these bikes who has parts, knowledge and advice? Second, can any of you answer my questions or posit advice particularly regarding my observations?

    I don't have a lot of experience with 2 strokes, especially modern ones. I know almost nothing at all about trials or trials bikes. I started the bike a couple of weeks ago and ran it for less than a minute. It has a left-side kick, the lever is very high, very short and an absolute mother to kick. Compression is good

    The carburetor is a Mikuni. It is more like my 1970s Hondas than my 2001 KTM or even my old '85 Tri-Z 250 three wheeler. It does not have a choke but it has a lever that does something. I think it might make it more rich. I don't know if it is to be used when starting or for certain trials activities. Does anyone know what this is for?

    The transmission has a stuck clutch. I began to investigate and noticed through the looking glass that the oil inside appears to be milky. I was able to break the clutch loose but it seizes again if it sits at all. I plan to drain it this weekend and try to get the clutch cover off. I was going to refill with ATF since it has detergents. Is this a good idea? What would be better?

    The coolant is missing. I think it may explain the water in the transmission. How would it get there? One hose clamp was loose when I got it as if someone was trying to sort it out.

    The rear brake has no fluid. It has a master and slave cylinder but there does not appear to be any kind of reservoir. Where do I put the fluid? I assume it bleeds at the slave like any other brake system.

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    #1
    DyrWolf likes this.
  2. lineaway

    lineaway Long timer

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    Before you do anything else. Take the water pump cover off and check for corrosion. These old bikes had a corrosion issue and chances are the center case is ruined which means the bike is junk. The cases are pretty much obsolete and if you did find all the parts it would be over a grand.
    Now if you really wanted to find someone to work on it, I would wander over to Jasper, TN. Saturday to watch the nationals at the Trials Training Center. Stop by the Beta pits and ask around for someone local. Besides you would get to watch some awesome riding.
    #2
  3. lamotovita

    lamotovita DAMN SNOWBIRD!

    Joined:
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    Yes find the coolant leak first. Anything can be repaired, it may take some ingenuity . The US importer and parts distributor for your bike is long gone, there are dealers who worked on them and may still have some parts, as well as European and Canadian sources.
    The clutch will need to be disassembled and inspected/cleaned.
    You are correct about your carb, you have an enrichener, not a choke. Many will tell you otherwise, they are wrong, you are right.
    I recall many riders having problems with the rear brake hydraulics in those days, I don't know what the issues were.
    One other thing to consider is that ignition parts are not available for some of the old Betas, particularly the stator, and failures are not uncommon. I think there are complete ignitions available to replace the original but they are expensive.
    #3
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  4. Hoss Cartright

    Hoss Cartright Been here awhile

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    #4
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  5. Brewtus

    Brewtus Buffoonery, Inc.

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    #5
  6. motobene

    motobene Motoing for 46 years

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    That's a pull-stem-type choke.
    #6
  7. Mini Trail

    Mini Trail n°°b

    Joined:
    Jun 27, 2007
    Oddometer:
    2,422
    Location:
    West Tennessee
    Thanks for the reply. I took some of your advice and pulled the water pump cover. It is so full of corrosion that at some point the impeller was stuck and the shaft spun inside it. I'd love to get the impeller off and look inside but it lacks about 1/16" of clearance that will require the flywheel to be pulled to get the damn thing out. I had to go to Baltimore this week so I didn't get far at all. I'd say that this bike is pretty screwed which is unfortunate. I'm wondering now if I can get enough corrosion out to at least use it a little bit.

    I don't have much in this bike and should be able to make money parting it but it just seemed perfect. It is modern, single shock, disk brakes and water cooled. It already has a light and horn and just turned old enough to register as antique.

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    #7