Carb shim/jet experience
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  1. #1
    Senior Member yamamont's Avatar
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    So I got some shim washers from Mcmaster/carr as recommended from the carb tune posting. Also I got a #130 jet. I live at just above sea level. So I installed 4 .001 washers and the 130 jet. The bike started off fine until I came to a hill. Then it wouldnt rev up above idle. I had to pull the choke all the way on to get it home. So then I removed the needle shims and left in the 130 jet. Same problem. So the I put back in the stock 126 jet and 3 shims. Now she works great! I can feel a bit more pull and she runs great.



    So I have the stock exhaust.

    removed the softer snorkle thing from the airbox.

    no other modificatios.

    I did not drill out the idle hole thing??



    So can anyone tell me why the 130 jet would not work out? Is it because my exhaust is too restrictive? I am hopin to learn something here1




  2. #2
    Member Robert Ibe's Avatar
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    who made the jet and whats in the jar.

  3. #3
    Member birdmove's Avatar
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    Yeah, I want some of whats in the jar too!



    jon
    Jon

    Keaau, Hawaii

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  5. #4
    Senior Member pgilles's Avatar
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    0.001" shims are too small. You want 0.010" shims.
    Sold bike.



    Youtube vids of old TW's acceleration:

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  6. #5
    Banned qwerty's Avatar
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    What you describe is not a jetting issue. Sounds more like a fuel supply issue. Take your needle to the hardware store and get a $0.05 flat washer instead of expensive "shims".




  7. #6
    Senior Member yamamont's Avatar
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    I double checked the shim size and they are indeed .010. my typo. 7$ is cheap to me!!



    I dont know what was in the jar. the dewd in the photo is not me, but my friend Ed. So basically, I want what was in the jar too!!



    Qwerty, with the 130 jet and 4 shims then more fuel should be going in right?? But it would only run smooth with the choke on. Then with 126 jet and 3 shims its great. Am I understanding this wrong because that seems a bit back asswords? Educate me.....



    who wants to rock?


  8. #7
    Senior Member uktw125's Avatar
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    Yes it does sound back asswards.



    EDIT: I didn't read your first post properly.



    So I'll try again, with the 130 jet and 4 shims was the spark plug black, wet, dry or what, If the small jet works better it sounds like you went too rich but if you had to use the choke it sounds like it was weak. Back asswards indeed. You will have to find out whether it was rich or weak also it was a Yamaha TK jet was it.

    I assume you have a CV (later model carb)



    Your mates look like a lot of fun.

  9. #8
    Senior Member pgilles's Avatar
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    Where did you get the 130 jet from? What's the part number? What does it look like? Round head? Hex head? The 130 you have may not be the 130 that's commonly talked about on here. There are differences in manufacturers.
    Sold bike.



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  10. #9
    Senior Member yamamont's Avatar
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    Got the jet at my local yamaha dealer and it is round head. I dont have a part number though I could dig it up if necassary. So I am not sure who specifically manufactured it. I have yet to view the spark plug. It runs great now. I just got back from running some errands on the bike and it is the best it has been so far. I am not really trying to find a bunch of power here, I know it is only 196cc. I got a WR250 that has tons of frikn power. Ridding that Sunday at Lake Wenatchee. Anyways, thanks for all the replies and help guys...





    YM

  11. #10
    Banned qwerty's Avatar
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    Your #130 didn't cause your ride quality problem, especially since it seems the bike ran fine until you reached the hill, than ran so lean it would only run with the choke on. You either have a defective jet, it sucked trash into the hole just as you reached the hill, or something else was preventing fuel to reach the engine. Better figure it out ASAP before you get stranded in a bad place.




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