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  1. #1
    barthel's Avatar
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    Hard Start Question

    I've just recently bought a pair of Jet Ski's, both '98's, an 1100 SXT and a 750 SXT. I've spent the last few days cleaning them up and flushing them out when I noticed something. The 1100 will start, but it takes a bit to get going. Choke, work the throttle, it will eventually start and idle. The 750 starts first time, every time, no choke and almost no throttle. The ski's were supposedly serviced soon before I bought them, but I did go the extra step to change the spark plugs.

    Is that just the way the 1100's are, or should I be looking for something else?

    Thanks in advance.


  2. #2
    steve45's Avatar
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    Most carbureted JetSkis require some cranking to get fuel into the carbs. This can be eliminated by installing a primer.

    The carbs in your STX 1100 have a different type of carburetor called a CV or Constant Velocity carb. If you install a primer on that one, do NOT remove the chokes! The restriction provided by the chokes and factory flame arrestor are important for proper fuel metering.

    Primers will make your engine start instantly, I use them on all my toys and highly recommend them. They will make your starter last a LOT longer, too!

  3. #3
    barthel's Avatar
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    Something like this?

    http://www.parkeryamaha.com/primerkitforpwc.aspx

    Do I just install it in the fuel line, or do I have to fit it to each carb?

  4. #4
    steve45's Avatar
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    That's a primer kit, but they include fittings that replace the chokes. You don't want to do that.

    Here's how I did it on my Ultra: http://www.greenhulk.net/forums/show...-did-you-do-it

    On my STX, I just drilled holes in the balance tube fittings and installed fittings there. If you mount the nozzles below the carbs, you don't mess up the metering, and you don't have to mess with the primer hoses if you pull the carbs out. Some people mount the primer nozzles in the flame arrestors or drill holes in the carbs.

  5. #5
    barthel's Avatar
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    Ok, I have a dumb question. What is the balance tube?

    Based on the pic of your Ultra manifold, is the STX manifold set up the same way?

  6. #6
    steve45's Avatar
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    Similar. There is a hose on the intake manifold that connects each intake.

  7. #7
    barthel's Avatar
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    Quote Originally Posted by steve45 View Post
    Similar. There is a hose on the intake manifold that connects each intake.
    So I could just put one connector on that tube rather than having to drill 3 in the intake?

  8. #8
    steve45's Avatar
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    Yes! It will work just fine.

  9. #9
    barthel's Avatar
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    Hey Steve, I checked out the intake on my ski. It does have a tube down there, but it's rubber. It looks like in goes to cylinders 1 & 3, but not #2. Would it still be OK to tap that line even though it doesn't feed #2, or should I pull the intake off and drill and tap the intake itself?

  10. #10
    steve45's Avatar
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    On my 1100, I just drilled and tapped the flat spots on the elbows for the balance tubes. I got 1/8" barb x 1/8 NPT fittings at our local Ace Hardware. Of course, you want to make sure you get all the cuttings out before installing on the engine.

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