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  1. #1

    midrange bog on.. carb? heres some plug pics..

    Title should have said - Midrange bog on 96 gsx 787... carbs?

    96 gsx - just got it.. it was a project ski .. ski sat for 8 years.. bought new to me carbs from a forum member who built them and tuned them to a stock 787. entire fuel system cleaned and all hoses replaced.

    put these new plugs in the machine and started her up for the first time.. idled good.. started to die a little bit on the high end.. then gave me a little trouble low-mid range.. but idled good.. push the throttle past the bog and it seems as if it would "clean up" and go for a bit.. then die a little on the high end.

    here are some plug pics.. these plugs have about 5 mins on them.

    the real dark plug is the PTO plug - the other 2 pics are of the mag plug.. it was wet.. one pic was of the plug wet... the other pic is after i dried it off..

    any ideas on adjustments or if thats even the issue?

    Also- i had sprayed it with some fogging oil a few days ago when i had the carbs off ( sprayed right on the crank) since it had been sitting for so long.

    Pic on left is PTO - Middle pic is Mag plug AFTER i wiped the gas/oil off it, it was wet - Pic on the Right is the Mag plug Wet before i wiped it..
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. #2
    AndinoWatercraft's Avatar
    Join Date
    Feb 2008
    Puerto Rico
    Not so much of a fan of 787 engines but by the color of the plugs I could think it maybe running lean??
    Looks like they are turning red. They should be more wet and darker look. What are the carb jet size ,needle ,springs and turns?

  3. #3
    flyin' the friendly skies airbornexp's Avatar
    Join Date
    Aug 2007
    Mahomet, Il. USA
    the first picture is what your looking for the other two pretty rich.

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