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Thread: 1991 carb help

  1. #1
    Senior Member Snake2715's Avatar
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    1991 carb help

    Ok,



    I am new to these bikes, just picked ours up last year 2006, no real work needed only 900 miles. My buddy at that time picked up a 1991 with 6000 miles ran decent, smoked a little and harder to start.



    I started this thread as I had the 1991 leaking when I turned on the peacock.



    https://tw200forum.com/index.php?/top...028#entry13028





    anyway its that time to rebuild... i find this excellent thread on the teardown of the old arb and it still has some pics intact:



    https://tw200forum.com/forums/1/88964...ost.aspx#88964







    From bottom with bowl removed. Original parts are on the white backgound, with (from left) the pilot screw, jets, and needle valve parts roughly lined up with the 4 holes they go into.






    My question is I am going to clean this entire area carefully. Is there a thread on the stock settings for these? I will measure the turns of the screws as I remove them, but am hoping I can reset to stock for these screws... Also The splash guard washer (white in the picture with the two small holes).. that was just sitting in the bottom of the bowl, is that correct?







    Any help or direction anyone can give is appreciated.

  2. #2
    Senior Member PJungnitsch's Avatar
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    From what I remember it's only the mixture (pilot) screw that is adjustable, the rest just go to tight. Stock setting for the pilot is 1.5 to 2.5 turns out, I found my bike started much better at the richer setting of 4 turns out.



    The plastic shield AFAIK is a press fit on the main jet:







    Doubt if it is really that important.

  3. #3
    Senior Member Snake2715's Avatar
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    Ok I found the pilot was set to 3.75 turns out. A lot of destroyed gaskets or orings... basically mush and tore when trying to remove.



    Needle Valve is really not springy any longer and I believe that may be why we had a stuck float at one point. Needle valve seat screw is junk I cant seem to get it out.. not sure if I should continue as there is a gasket under there, and given the other gasket conditions to this point, I am guessing thats fried as well.





    Good to know that the jets are tight. i have not removed the pilot jet as i didnt have a small screwdriver handy... it was in the house and I was in the garage. Done for the night going to price a few parts and go from there.

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  5. #4
    Senior Member Snake2715's Avatar
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    Quick question for anyone able to answer... what part is the oring visible in PJungnitsch's post... next to (left of) the pilot screw? I cant find that oring on the parts diagram for this carb...

  6. #5
    Senior Member demarko69's Avatar
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    Quote Originally Posted by Snake2715 View Post
    Quick question for anyone able to answer... what part is the oring visible in PJungnitsch's post... next to (left of) the pilot screw? I cant find that oring on the parts diagram for this carb...






    you mean this? I dont know but may lizrdbrth or qwerty or 0ne of the other experts know what it is and where to get it

  7. #6
    Senior Member PJungnitsch's Avatar
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    I believe that is just an O-ring:







    Like in this kit here:



    http://cgi.ebay.ca/YAMAHA-TW200-TW-2...item43a723d650



    Note, not sure how good those kits are, ie there's no way I'd want a #38 pilot jet in mine.

  8. #7
    Senior Member demarko69's Avatar
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    I took mine apart and itlooks like a special oring, kinda flat with a round ridge around it..

  9. #8
    Senior Member Snake2715's Avatar
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    Quote Originally Posted by demarko69 View Post
    I took mine apart and itlooks like a special oring, kinda flat with a round ridge around it..




    Yeah it is and I am going to attempt to re use mine... however its not on the parts diagram I find it odd.

  10. #9
    Member raffles's Avatar
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    Quote Originally Posted by demarko69 View Post




    you mean this? I dont know but may lizrdbrth or qwerty or 0ne of the other experts know what it is and where to get it


    Hi did anybody ever find out if this o- ring can be ordered for early type carb if i understand its not item part no 360-24152-00-00 picture no 12 on my parts cat or poss no 11 on others

    Thanks markymark (uk) my bike has just started to cause a slight sweat from overflow tube, so i'm going to replace needle valve set and reset float, bike has only covered 2,500 miles from new, 1996 model imported new too united kingdom in 1999

  11. #10
    Junior Member TW669's Avatar
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    I´m in need of the o-ring in post #9. Anyone knows a part number.
    Typical situation, i had to clean the carb. I took extra care not losing any of all those small parts and in the end the o-ring was missing.
    I tried a generic o-ring but it does not fit correctly, looks like the Yam o-ring is kinda special

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