OMG help the noob

Discussion in 'Trials' started by BEEF706, Sep 21, 2013.

  1. BEEF706

    BEEF706 King of the dumb dab

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    So, I recently bought a 2004 Beta Rev 3. Being me, I had to clean it. It has always been hard to start, and today I had a really hard time. It seems to catch for a second, then wont start at all. also if I kick it, there was gas coming out of the overflows. I pulled the plug, black as night, and put a new one in, nada. I though it might be crud in the jets or something, so I pulled the carb off, ran guitar string wire through the jest, cleaned out the bottom and put it back on. NOW, when I turned on the gas, the gas was flowing out of this tube:
    [​IMG]
    the floats seemed to be moving OK, but something is wrong I a supposed to ride tomorrow, and have really been looking forward to it, andy help?
    #1
  2. NMTrailboss

    NMTrailboss Team Dead End

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    If you're talking about that clear(ish) tube, that is the vent hose. If fuel is getting that high, then the float is most likely sticking open. There may be a piece of debris between the float needle and seat keeping it open. Inspect the float for free movement and make sure the needle and seat are clean. With the float bowl off, hook the carb. to the fuel inlet hose (or an aux. bottle) and turn the fuel valve on. When fuel starts flowing through the float valve, slowly lift the float up and see if the fuel shuts off when the needle contacts the seat. If so, you should have resolved that problem. May as well check float height while there. Also, if fuel has been flowing due to a stuck float, the engine may have filled with fuel as well. Might need to remove the spark plug and kick the engine through to make sure there is no fuel in the bottom end (keep the spark plug and cap away from the hole while doing this!!!!).

    Yet another good reason to have two trials bikes!
    #2
  3. Gordy

    Gordy Team Listo

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    Deb recently flooded her Sherco so bad that the crankcase filled up and the exhaust was full of gas!!:lol3

    I had to pull the plug, turned it upside down and blew compressed air into the plug hole to get it dry enough to start.

    Like NMTB said you probably got some dirt under the float needle. Usually when that happens, by the time you get in there to check it out, it has flushed itself out.

    I just love working on bikes the night before a ride! :baldy.
    #3
  4. BEEF706

    BEEF706 King of the dumb dab

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    THANKS Curtis, you are the Jedi master :D The floats must have been stuck when i put em back together, now back to my regular business, falling over slowly. :clap
    #4
  5. BEEF706

    BEEF706 King of the dumb dab

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    I didi that to my DRZ when the petcock failed, that was and adventure, I guess I just don't have enough stress in my life :freaky You feeling well enough to go?
    #5
  6. Gordy

    Gordy Team Listo

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    I'm loaded up and will just see how I feel in the morning. I hope so!!
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  7. BEEF706

    BEEF706 King of the dumb dab

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    ^^^^^^^^^
    Hope to see ya there
    #7
  8. NMTrailboss

    NMTrailboss Team Dead End

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    Did you get her started? :ear
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  9. BEEF706

    BEEF706 King of the dumb dab

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    Got her started and rode around my back yard loop in the dark, I am not a smart man. :norton So I'm in with my sexy Italian tomorrow.
    #9
  10. NMTrailboss

    NMTrailboss Team Dead End

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    :clap:clap:clap

    :thumb
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  11. lineaway

    lineaway Long timer

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    The Beta mikuni`s are hexed. Put a small V cut high on both vent tubes or they act like a vacuum and drain the carb.
    #11
  12. lineaway

    lineaway Long timer

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    PS. You have to turn off the gas always or she will flood. Did you notice what jets are in it. It was a Butler bike.
    #12
  13. BEEF706

    BEEF706 King of the dumb dab

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    I turn the tap off religeously since the DRZ incident, I didnt notice the jets, do you have recommendations? I will get some brass and re-jet.
    #13
  14. lineaway

    lineaway Long timer

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    Roswell 140 main, 30 pilot. San Ysidro 135, 30 pilot, Sipapu 130 main 30 pilot. Some bikes even need a 35 pilot. 145-150main at sea level.
    #14
  15. BEEF706

    BEEF706 King of the dumb dab

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    thanks Bob, I will look later and get some jets to have a range.
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  16. Twin-shocker

    Twin-shocker Long timer

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    Mikuni carbs on Beta tend to vent fuel through the atmo tube, due to the angle the carb is mounted, and if the fuel is left switched on, this can drain all the fuel from tank. There is a relatively simple modification that was done back in the day to cure this, which relocates the atmo vent internally, which means no more problems.
    #16
  17. Gordy

    Gordy Team Listo

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    We are supposed to re-jet? :rofl
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  18. lineaway

    lineaway Long timer

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    http://www.trialscentral.com/forums/topic/11668-new-rev-3-mikuni-carb/
    This is the third version of the beta carb fix. which says to buy a new carb. The first version is the Billy T. fix which involved a float height and vent tube fix. The one twinshocker states involved drilling two holes inside the carb body and adding a cross over pipe.

    This could take days to read if you have the time, or put the v- cut up high and I can help set the floats if you are still having problems.
    #18
  19. joe cool

    joe cool Been here awhile

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    Also when you park the bike try to keep the front wheel higher than the rear to stop the bike from flooding. I now run a dellorto carb on my 05 Rev. which works much better.
    #19
  20. Twin-shocker

    Twin-shocker Long timer

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    The only real cure for the Beta Mik carb flooding problem is relocating where the atmo tube intake is inside the carb body. As the carb is mounted at an angle, the position of the intake needs to be moved to stop fuel self siphoning through the atmo tube. Used to be details of how to do this on the net, but cant find them now. Was pretty easy to do though, and involved a small drill and blocking the old intake with epoxy (cant remember exact details though, as not done one for a long while).
    #20