1986 XT 600 Raptor carb conversion, pics tonight.

Discussion in 'Thumpers' started by edeher, Jul 9, 2009.

  1. edeher

    edeher Been here awhile

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    I just got the dual carb setup off a 2001 raptor 660 and its soaking in the parts cleaner at work. I will put it straight on the bike when i get home and take a couple pics and let who is interested know how and if it runs with this set up. It will definatley have to be re-jetted but ill see if it starts like this. The xt jets might even fit in the raptor carb....both yamaha jets.

    There are three vacuum/air intakes on the carb, two to lift the throttle body, i know because they lift when i blow of them. There is also another vacuum or air intake between the two carbs connecting them and it is on a swivel.... i have no clue what it is for but i will leave it disconnected and see if it starts, maybe run a hose to the airbox or intake manifold....see which one works better.

    Anywaz i will update when i get home and put it on, The carb set up still has the thumb throttle set up on it so that will be fun to try on a motorcycle.....:wink:
    #1
  2. ShadyRascal

    ShadyRascal Master of None

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    You can get a twist throttle conversion for those, advertised in any ATV magazine.

    I have some experience with those carbs, they've worked well for me.

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    #2
  3. edeher

    edeher Been here awhile

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    yea? how much for the conversion? i was thinking about putting the cable straight into the xt twist assembly.


    WHat is that vacuum looking one connecting the two carbs on a swivel? where does that go?
    #3
  4. edeher

    edeher Been here awhile

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    Well still no go...First the carbs would not fit but i opened the intake manifold up a little with a dremmal and not it fits....put fuel to it and it will not start or even backfire....i dont know what it could be....i left all the vacuums and air intakes open since they all seem to go to the airbox anywaz.... here are some pics, let me know if you have any ideas...

    The only thing i can think of is maybe the plug is fouled. i know the guy said he put in a new one but since the gas was old and the carbs were running like crap maybe it fouled that fast..... possible?

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    #4
  5. edeher

    edeher Been here awhile

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    bump...any ideas?
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  6. edeher

    edeher Been here awhile

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    bump
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  7. edeher

    edeher Been here awhile

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    ok...i flushed out the tank and put new gas in and added a fuel filter. I put the new carbs on with no air filter on and i got it to start once but it died and wouldnt start again...there is no choke on these raptor carbs though... something i didnt think of
    #7
  8. Olas

    Olas the darkness

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    Have you tried turning the idle up a bit more? If you got it to start that is a good sign!​
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  9. edeher

    edeher Been here awhile

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    i tried pushing some throttle but nothing...thats the same thing basically
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  10. Olas

    Olas the darkness

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    Theoretically,yes, it is basically the same but it wouldn't hurt to try! Who knows, maybe the throttle you are giving it is too much when the bike is cold....
    #10
  11. edeher

    edeher Been here awhile

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    true thats a good point. I was also concerned about that connector. It is number 6 in this diagram and connects to number 51 which is a spring/ compressor???? I have no clue what this does...maybe this is why it will not start. I might have to buy part 51 or find out what it does to try and resolve it some how.
    #11
  12. edeher

    edeher Been here awhile

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  13. edeher

    edeher Been here awhile

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    im thinking it may be linked to the other two connectors that lift the throttle bodies and it has to be blocked off for them to be lifted properly...
    #13
  14. edeher

    edeher Been here awhile

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    just got the bike to start with starter fluid and i could rev it once it started but it will not idle...and it sounds like shit!!! at least i know its something with the carb and its a step forward!
    #14
  15. Olas

    Olas the darkness

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    Did you actually take the carb apart and clean it? I would start off by doing that and then deciding if you need different jets. The pilot jet could be clogged up causing it to stall out. Do a thorough clean and take your time, do it right the first time, it will pay off in the end!!
    #15
  16. edeher

    edeher Been here awhile

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    i soaked the carb in the parts cleaner at work, took it apart and cleaned all the jets and cleaned and tank out and used fresh gas. It sounds like it wants to start but it just wont.
    #16
  17. edeher

    edeher Been here awhile

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    got it to start again with some starter fluid and it will almost idle with some throttle assistance. But the exhaust pops ALOT and back fires ALOT.... and is still very hard to start and got hot very fast... Could this be electrical? Ive read the timing is automatically adjusted by the cdi or some electrical component. Or maybe a bad coil?? I noticed the spark plug adapter from the coil is cracked but i dont see how that could be doing this???
    #17
  18. edeher

    edeher Been here awhile

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    think i may have found the problem!!! I just put new gas in the tank but when i drained the carb just now the gas coming out was yellowish/ orange!!! the gas tank is comtaminating the gas and maybe causing all of this!!! is there any way i could use a glass jar as a gas tank just to try to start it?

    (this guy had the tank coated inside with something and i believe messed the tank up!!!) maybe ill have to buy a new one.
    #18
  19. edeher

    edeher Been here awhile

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    Alright i have solved the problem...This has been like a log for me to post my toughts in more than anything, but thanks for who ever helped out. There is a fuel screw on each carb under the bowl that has to be turned out about 3/4 to 1 full turn for the bike to start and idle good. Here is a good sticky for anyone interested in knowing what it is and what it does and how to set it. It helped me out alot.

    http://www.raptorforum.com/forums/showthread.php?t=47668

    Now its time for jetting!!!!
    #19
  20. BIG ED XT FAN

    BIG ED XT FAN Long timer

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    You get it to run ? Fix the cable? :evil
    #20