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  1. #1

    SLX cutting out at full speed

    Hello you chaps over there.

    First, I must commend everyone concerned for an excellent and helpful site.

    Now, I wonder if you could advise me on a problem, please, which I have with a recently purchased SLX 1200 with 59hrs on the clock (early 2000 model). Everything works fine and she runs nicely up and down the rev range, except when held at flat out, (an indicated 61-62 on the display) for more than about 30 secs. She cuts out very abruptly, as if the ignition has been turned off. Yet starts again without a problem and runs fine until held at top speed again, when the same thing happens.

    The forth and final time this happened, she was slightly hesitant starting, as if the battery was flat and I did notice the display practically went out when I pressed the starter button. However on the second attempt everything worked fine again.

    I have since checked the battery terminals are clean and tight, and had the ignition cut out switch on the handle bars to pieces and cleaned the contacts in there. Not that they were overly dirty. But there was a slight bit of corrosion, probably from lack of use. The rest of the wiring seems fine and is as built by Polaris. The battery is new.

    I have not been out since the above and as I have not found an obvious cause am wondering if perhaps the ignition module is faulty and breaking down when under maximum load? There is one other thing, the previous owner used BR8ES plugs, I used BR9ES in the 1050, which is, I presume, the correct plug for 1200 also. The BR8 is a colder plug, would you think this is having any influence on the cutting out?

    I'd be most grateful for any thoughts anyone may have.

    Thanks.

    PS. I bought this machine because my wonderful SL1050, which I was so lucky to choose, and which has been immense fun over the last 10 years, has very sadly succumbed to a corroded back main bearing and I just had to get out on the water again. I really wanted a pro 1200 but couldn't find one!


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Welcome

    Exactly which engine size and model year do you have?
    The last two digits on the HIN number plate are the model year.

    Has the engine ever been rebuilt?

    Have the carburetors been rebuilt, and the fuel lines replaced?

    I am suspecting the engine may be suffering from lean seizure.

    What can happen is that the fuel system is not working 100%. At high power, the fuel delivery is too little, and the pistons get much hotter than they should.

    The pistons expand from the excess heat, and grow too large to slide inside the cylinder bores. They then seize in place, and the engine stops.

    With the engine stopped, the pistons begin to cool down, and shrink just enough to allow them to move again.

    The problem could be electrical, but I am suspecting it is a fuel system and carb issue.

    The fact that the battery strained to crank the engine suggests it was still heat seized.

    Lean seize tends to be rough on the pistons and cylinder walls. You can inspect them through the spark plug holes with a tiny flashlight, or better yet a borescope.

    To really see what shape the cylinder walls are in, you would remove the cylinder heads.

    A compression check would also be useful.
    All spark plugs out, throttle wide open - check each cylinder twice.

  3. #3
    Addicted Member 5001craig's Avatar
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    Welcome to the site! Awesome people here and their help has already started.

    I've found with my SLX that it likes a good and fully charged battery. If the lean condition that K447 mentioned isn't the case, I'd recommend replacing the battery or at least checking it out.

  4. #4

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    it's a 1200

  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by 785 lugs View Post
    it's a 1200
    The 'early 2000' comment made me suspect it could possibly be a 1999 1050.

    If it is a 1999, then it is a different original ignition system than 2000+

    I wanted to confirm the model year and engine size, just in case it wasn't a 2000 1200 SLX.

  6. #6

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    i think the 99's are the updated stator if i remember right

    Is the Ski White/Grey or Black/Yellow ???

  7. #7
    bowsniper's Avatar
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    Does it look like this? this is a 2000SLX.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	100_0050.jpg 
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  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by 785 lugs View Post
    i think the 99's are the updated stator if i remember right...
    My understanding is that only the 1999 1200's have the Gen III ignition, which in 1999 was only the Genesis and the X-45 (SLTX-B)

    All other 1996-1999 domestics have the earlier original ignitions.

  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Hulk.

    First make sure the battery is in good shape.

    Next, make sure all elec connectons are clean and tight. Especially grounds.

    If the spark plug boots are removeable from the wires, remove them and cut about 1/4" off the wires to expose fresh/clean wire and resecure the boots back on.

    Unfortunately it sounds like an elec. stator starting to go bad. The added heat of WOT is probably enough to affect the spark.

  10. #10

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    Quote Originally Posted by K447 View Post
    My understanding is that only the 1999 1200's have the Gen III ignition, which in 1999 was only the Genesis and the X-45 (SLTX-B)

    All other 1996-1999 domestics have the earlier original ignitions.
    the 99 SLX is the updated stator with the old style wiring and case grommet but the stator windings are the updated ones

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