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  1. #1

    951di 2002 running rich??

    Hi all. I've put new plugs in my gtx di today. After a first day out today I've checked the plugs and they are both a bit sooty and black. Any suggestions or ideas about it?
    Dan


  2. #2
    diamondwatercraft's Avatar
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    Check the oil pump. It could be adjusted a bit rich therefore making your plugs black.

  3. #3
    Quote Originally Posted by diamondwatercraft View Post
    Check the oil pump. It could be adjusted a bit rich therefore making your plugs black.
    I didn't realise there was any adjustment on the pump . I'd be a little worried about adjusting.how do you do it?
    Last edited by ukseadooer; 07-26-2013 at 03:36 PM.

  4. #4
    diamondwatercraft's Avatar
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    get a mirror and look under the exhaust at the front of the engine. You should see a pump that moves when you apply the throttle. See if the marks on the arm that is moving is lined up with the mark on the pump when you are at zero throttle.

  5. #5
    Hi Diamond - Had a look this morning - Ive taken a couple of pictures for you to look at - What do you think? One is at idle , one is at wot.
    Click image for larger version. 

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    Click image for larger version. 

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  6. #6
    SURFnTURF's Avatar
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    The alignment marks need to be lined up.
    You cant adjust the idle on a DI so you only need to set it properly when the engine is not running
    Loosen jam nut and turn cable adjustment nut to
    obtain the pump mark alignment.
    The adjustment is located under the throttle body
    bracket

    I dont think the slight misalignment is causing the plugs to be sooty, What grade of fuel are you using ? is it old fuel ? what type of oil and the brand are you using ?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by SURFnTURF; 07-26-2013 at 07:27 PM.

  7. #7
    Quote Originally Posted by SURFnTURF View Post
    The alignment marks need to be lined up.
    You cant adjust the idle on a DI so you only need to set it properly when the engine is not running
    Loosen jam nut and turn cable adjustment nut to
    obtain the pump mark alignment.
    The adjustment is located under the throttle body
    bracket

    I dont think the slight misalignment is causing the plugs to be sooty, What grade of fuel are you using ? is it old fuel ? what type of oil and the brand are you using ?

    It's running xps-2 oil. I've been through 2 tanks of unleaded fuel in the last couple of months so the fuel should be good. It's 95 ron standard stuff.

  8. #8
    Pic of plugs...Click image for larger version. 

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    Let me know what you think before I go tampering with the oil pump.

  9. #9
    diamondwatercraft's Avatar
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    You can see from the pics of the oil pump that it is set close to the rich mark. The first pic is the one that tells the story. Anywhere between those two marks at idle is correct. BE CAREFUL!!!! Do not dial it back to the first line all at once if you have your mind set on dialing it down to try and get some of that color out of the plugs.

    I would suggest adjust it to the middle of the two marks at idle if you REALLY want to make a adjustment. Then check your plugs again. Only if you really want to mess with it.

    DI's run real hot because they do not burn much fuel. Fuel acts as a lubricant inside your cylinders. Regular carbed engines use more fuel and spit excess out of the exhaust. That helps in cooling but does not do too much good for the lakes.

    I like to run mine a bit rich too just to make sure that I don't go to far and have a issue with burning a piston.

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