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  1. #1

    2004 Yamaha XLT800 Hard to start.. Help Please?

    I just purchased this and have ran it a few times. Once its started it runs great! Its sometimes very hard to get started cold and when hot. Any suggestions? Is there some crazy sequence on choking and throttle maybe?

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  2. #2
    powerstroke specialist mikegp's Avatar
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    time for carbs to be clean and rebuilt .

  3. #3
    That's what I thought. Just ordered the rebuild kit.

  4. #4
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    generally hard to start even after a rebuild.

    try full chopke and 1/16 thottle..five seconds crank cycles.

    you'll find a sweet spot on throttle that will allow a start with no more then three cranking cycles.

    if it has better then 150 hours on the clock then pulling the carbs and also replacing the oil lines is a good idea.

    having the idle set too high is what I find makes these yammies hard to start, until you learn biffs trick that is.

  5. #5
    Quote Originally Posted by nmpeter View Post
    generally hard to start even after a rebuild.

    try full chopke and 1/16 thottle..five seconds crank cycles.

    you'll find a sweet spot on throttle that will allow a start with no more then three cranking cycles.

    if it has better then 150 hours on the clock then pulling the carbs and also replacing the oil lines is a good idea.

    having the idle set too high is what I find makes these yammies hard to start, until you learn biffs trick that is.

    Thanks again Pete. At idle it moves forward faster than I would think...does this mean the idle is too high? It's hot 110 hours. I put some power tune through it and blew out ALOT of black stuff, but still hard to start.

  6. #6
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    idle speed out of water is typically 2500 rpm give or take, try lowering the idle speed 1/4 turn and see if you can find the sweet spot.

  7. #7

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    Use only OEM mikuni diaphragm...ensure that both accelerator tube's are able to squirt fuel (they tend tobe clogged)...Replace the pilot jets, any imperfection will cause a PV or cylinder problem... at sealevel ( i perfer 95 pilots vs stock 90s) Do the pressure balancing mod in the FAQ section...use one of the old pilot 90 in the return tee..clamp oil line on to carbs, not tie straps....ride on for ever!!

  8. #8
    Quote Originally Posted by Crazypirate View Post
    Use only OEM mikuni diaphragm...ensure that both accelerator tube's are able to squirt fuel (they tend tobe clogged)...Replace the pilot jets, any imperfection will cause a PV or cylinder problem... at sealevel ( i perfer 95 pilots vs stock 90s) Do the pressure balancing mod in the FAQ section...use one of the old pilot 90 in the return tee..clamp oil line on to carbs, not tie straps....ride on for ever!!

    Thanks Crazypirate!!
    "Do the pressure balancing mod in the FAQ section" Can you direct me to this?

  9. #9
    Quote Originally Posted by Crazypirate View Post
    Use only OEM mikuni diaphragm...ensure that both accelerator tube's are able to squirt fuel (they tend tobe clogged)...Replace the pilot jets, any imperfection will cause a PV or cylinder problem... at sealevel ( i perfer 95 pilots vs stock 90s) Do the pressure balancing mod in the FAQ section...use one of the old pilot 90 in the return tee..clamp oil line on to carbs, not tie straps....ride on for ever!!
    What is the part number on the 95 pilot jet replacement?

  10. #10

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    Mikuni pn is N100.606. (Size)

    http://www.greenhulk.net/forums/showthread.php?t=177671

    When you get the accelerator squirting in both carbs, It is very easy to start...Full choke, Squeeze the throttle a few times, (to squirt in some fuel in), hit the button and shove in the choke very shortly after it starts.
    Last edited by Crazypirate; 03-23-2017 at 06:24 PM. Reason: more info

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