1974 yamaha dt360 carb

Discussion in '2 smokers' started by Kevin 007, Dec 26, 2010.

  1. Kevin 007

    Kevin 007 Adventurer

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    90
    No it does stall out.
    I have since made some more progress. With some more playing around, it now is nearly perfect. The air screw is turned out about 3 turns, idle is right down low. I can barley see past the slide like you mentioned.
    The throttle is snapping shut.
    So for the most part, the miss is gone. I sometimes get a bit of a quiver or a stumble in that same throttle range, I am going to adjust the float height once more and I have a feeling it will cure it. I think its a bit high.

    Im almost there haha:D Thanks Stainless!
    #41
  2. stainlesscycle

    stainlesscycle Long timer

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    if you're 3 turns out, you probably need a leaner pilot...
    #42
  3. Kevin 007

    Kevin 007 Adventurer

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    What is the correct float height for my machine?

    If I hold the carb upright now, the float level is just a little higher than flat, or parrallel with the carb body.

    Should it be perfectly flat? (parrallel with carb body)
    #43
  4. Kevin 007

    Kevin 007 Adventurer

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    So I just tried two more pilot jets. A 55 and a 45, and the one that was in it was a 50.
    The 45 was too lean, so I didn't play with that one too much. Lean looking plug, not running smooth.
    The 55 was better, I adjusted the needle height one step at a time and at each setting I adjusted the air screw in small increments right from seated to 3-1/2 turns out. I also adjusted the float height. Very time consuming :rofl
    If the float is too high, what symptoms should I expect other that leaking from the overflow?

    Anyways, I have it to a rideable state but it is still not perfect. I will start and idle well and perform AWSOME right through the range but at about 1/16-1/8 throttle it coughs and sputters still. And once I reach cruising speed, this is where I like to hold the throttle to maintain the speed. so its always coughing haha.

    How about air intrusion between the carb and cylinder? I put a new reed gasket in it when the reed was replaced, I just put a skim of silicone on it, maybe it needs more?
    The crank seals are only a few years old so I wouldn't expect them to be bad.
    I put a new oring on the base of the main jet every time the carb is apart, and a new plug each work session.

    P.S- I read the plug after every adjustment and its been looking clear. Not tan or dark or black, but clear....whatever thats about. The exhaust kinda smells rich however
    #44
  5. manxkipper

    manxkipper Fishpistel

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    Here is a list of float heights from an old manual I have. May be of some help. No info on jet sizes oddly enough.
    #45
  6. Kevin 007

    Kevin 007 Adventurer

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    Thanks very much for the reply.

    Yeah mine was close, it was a 19mm, I changed it to 17 and .... no difference hahaha

    Thanks again.
    #46
  7. kawie95

    kawie95 Member

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    Oddometer:
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    Manhattan Beach, CA
    I have the same issue with my RT1. I am thinking of checking the flywheel. Sometimes the woodruff key sheers or I have to swap the flywheel back and forth with another one I have. I read somewhere else they can get demagnetized?
    #47
  8. jub jub

    jub jub frumiousbandersnatch

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    Cut my teeth on a DT-1. Great engine, handled like shit.:lol3
    #48
  9. luckychucky

    luckychucky Long timer

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    Hope I don't get to familiar with this carb; I just wanna ride it, and ride it some more. My carb works great. I do know it's a MIKUNI, I'll try to figure what model on my 73 DT350. Great Bike, I think. I'm third owner.
    #49
  10. luckychucky

    luckychucky Long timer

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    I take that last post back, it loads up a little bit, need to adjust float!


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    #50
  11. luckychucky

    luckychucky Long timer

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    [​IMG]
    #51
  12. dan-c

    dan-c Back

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    That's a 1973 :D
    #52
  13. luckychucky

    luckychucky Long timer

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    Check 1973 thanks


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    #53
  14. dan-c

    dan-c Back

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    So did you get the carb sorted?
    #54
  15. luckychucky

    luckychucky Long timer

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    Yes, I Still have to shut off tank valve or it will fill up cylinder. But can ride it now. Also, I quit pre mixing and just let the induction system auto lube do its thing.


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    #55
  16. Tim McKittrick

    Tim McKittrick Long timer

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    #56
  17. GP MX Fan

    GP MX Fan Adventurer

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    yep 1973. in 74 nomenclature all changed to DT and engine size with new frames and cases
    #57
  18. luckychucky

    luckychucky Long timer

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    Thanks, saved the link. Need to order. Right now I'm in love with my magna, and the rt/dt 360 sitting in basement covered up like a stepchild. Sad. Sucks, need to reduce my stable to one bike. Tuff decisions tho! I'll just keep them all covered up, and dig them out every now and then till I die. Having more than one bike is like being an Arabian with more than one wife. How do you keep them all happy. Geez!!!


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    #58