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    94 SL 750 Number 1 not firing

    I have a 750, owned it since new. I put new plugs in it every year. Number one does not fire. Multiple new plugs. Need guidance in how to trouble shoot or fix this problem. Help!


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    burtonrider10022's Avatar
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    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by burtonrider10022 View Post
    After trimming the spark plug wires, try swapping ignition coils to see if the problem moves.

    On the standard Fuji engines all three spark plugs fire together, every time. That means you can swap plug wires around and the engine should run the same.

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    BlueFishCrisis's Avatar
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    Welcome to the Hulk!!!

    What are your compression readings? Have you performed the fuel system upgrades?

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    burtonrider10022's Avatar
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    Quote Originally Posted by K447 View Post
    After trimming the spark plug wires, try swapping ignition coils to see if the problem moves.

    On the standard Fuji engines all three spark plugs fire together, every time. That means you can swap plug wires around and the engine should run the same.
    Seriously?

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    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by burtonrider10022 View Post
    Seriously?
    Yep. Search for 'Fuji wasted spark'

    Polaris used the wasted spark method on all the Fuji engines except the Pro 785.

    Wasted spark also present on the 2000-2004 and Update Kit domestic TWIN cylinder engines. I don't know about the original ignition 1996-1999 twins.

    Wasted spark is why the three Fuji ignition coils are all connected together in series. The Fuji CDI fires all three ignition coils together. One cylinder will be ready to fire on its power stroke while the other two are in exhaust or early intake phase so they do not ignite.

  7. #7

    Thumbs up Thank you all!

    Quote Originally Posted by 94SL750MI View Post
    I have a 750, owned it since new. I put new plugs in it every year. Number one does not fire. Multiple new plugs. Need guidance in how to trouble shoot or fix this problem. Help!
    Thank you! Spark is present on all three cylinders. Seems to be firing well but not the propewr power. I will check compression but suspect some type of Carb/fuel problem. Just replaced the inline filter also.

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