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Discussion Starter #1
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.



http://tw200forum.com/index.php?/topic/1509-carb-leak-with-picture/page__p__13028#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:



http://tw200forum.com/forums/1/88964/ShowPost.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.
 

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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.
 

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Discussion Starter #3
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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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...
 

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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...






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
 

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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
 

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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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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
Typical that some little part goes missing and likely the previous owner never put it back. I doubt you can order this washer/seal. There is no such seal on the schematics that I can find. I had a bag full of various O rings and found one that fits and works perfect. You could probably make a seal out of cork or some other gasket material.

I did miss this thread because it is mis named. These are TK carbs and not Mikuni.

GaryL
 

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I am pretty sure I used 2-106 V75B for the o-ring. It was a little bit thick so I thinned it using some fine emery paper. As long as the float bowl has to compress it a little bit all is fine.

If it wasn't the 2-106, then it was the 2-108 o-ring.

P2281272.JPG P2281273.JPG

If you are desperate for one PM me your address.
 

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Elime that info helps a lot. Judging by the pictures i would tend to say it was the 2-108 o-ring. These are generic o-rings? If so i should have no problem getting one over here, but thanks for the offer.

GaryL i realised that the thread name was misleading after i posted in this thread. And the person that lost the o-ring was clearly me, when i took the carb apart the o-ring was there. I removed it and put it aside with the other small parts. I don´t know how or why but when i put everything back together the o-ring wasn´t there anymore.

I couldn´t find a part number either in any of the schematics (i looked up every bike that used a comparable Teikei carb). I find that very strange because there must be a replacement part available from Yamaha. Also all the guys that rebuilt there carb must have had the same problem not finding a part number, there should be a lot of threads about this o-ring.
 

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I don't know if the newer style carbs after 2000 or 2001 are TK or Mikuni. I do know for sure the one you have is the same as mine and they are TK. You might look up the carb for the BW 200, That is the Big Wheel 200 because some guys say they are the same. I also have a carb off an XT 350 that has 2 carbs on it. One is nearly identical to a TW 200 carb but the other is very different. I don't believe any of these schematics are 100% correct and show every tiny part.

GaryL
 

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Elime that info helps a lot. Judging by the pictures i would tend to say it was the 2-108 o-ring. These are generic o-rings? If so i should have no problem getting one over here, but thanks for the offer.
Yes, they should be generic. I am 65% sure you want the 2-106. I bought both sizes not knowing which would fit and it has been a while. If you can get one of each just to be sure.

In case you need a float bowl gasket: http://tw200forum.com/forum/technical-help/9277-float-bowl-gasket.html
 

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garyL all TW carbs are TK. I´m 100% sure on this. The early 125 has a 24mm TK but it is a simple roundslide carb, the early 200´s (mine is a 96) have the carb pictured here and the late models 125+200+225 have the 28mm TK cv carb. After you mentioned the Xt350 carb i looked it up and it looks like the o-ring is shown in the xt350 schematics (part#27 gasket). I will have a visit at my local Yamaha dealer next week to hopefully verify this.

elime i will also buy both sizes just to be sure i have the right one in the end, and the tip for the float bowl gasket is great.
 

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garyL all TW carbs are TK. I´m 100% sure on this. The early 125 has a 24mm TK but it is a simple roundslide carb, the early 200´s (mine is a 96) have the carb pictured here and the late models 125+200+225 have the 28mm TK cv carb. After you mentioned the Xt350 carb i looked it up and it looks like the o-ring is shown in the xt350 schematics (part#27 gasket). I will have a visit at my local Yamaha dealer next week to hopefully verify this.

elime i will also buy both sizes just to be sure i have the right one in the end, and the tip for the float bowl gasket is great.
Good to hear that you might have found the little culprit! I always thought the TW 200s all had TK Carbs but in the last few days right here on our forum 2 different magazine write ups have been posted and both list the TW 200 carbs as 28 MM Mikunis.

GaryL
 

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In the spec sheet for the TW on the Yamaha USA site it also says it is a Mikuni carb (but it is not true, it is a Teikei !), i guess that is the reason for the confusion. Editors use the data they get from the manufactors. Someone should point out to Yamaha that they spread out false information about their own bikes.

I went to my local hardware store early this morning to get the o-rings elime mentioned, they didn´t have them in stock but they can order them. When i asked for prices, it almost blew me out of my socks. They want ~8Euro (~10$) for 2 tiny o-rings. Needlees to say i said thank you, i try my luck somewhere else.
Back at home i did some basement cleaning and found some old injectors from a car i worked on a few years ago and the o-ring that sits on top of the injector fits the carb. I now atleast have a temporary solution without spending a dime until i get the right parts.
 

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They want ~8Euro (~10$) for 2 tiny o-rings. Needlees to say i said thank you, i try my luck somewhere else.
If you have an o-ring that works you are done.

As to the price when my TW needed new valve cover gaskets / o-rings I went to Yamaha and they wanted $9 each! 18 bucks total for 2 o-ring ? Sorry, but that is robbery and I too moved on. I found a local outlet that deals in o-rings, Ace Seal (Aceseal.com) and went to see them. I took the valve cover and the old valve cover o-ring with me, the lady matched it up then asked how many I wanted. I asked how much. When she told me 25 cents each and I about hit the floor. When I recovered I said "I'll take $5 worth". They fit and work perfectly.

When ever I need o-rings I go to Ace Seal. The wonderful thing about o-rings is if they are a little small they stretch, or if a little to big they compress -- I can squeeze them into the groove -- and they still work just fine!
 
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