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  1. #1
    Firefighterarcher's Avatar
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    A stupid question

    A stupid question, what are the main differences between the Blue Fuji engines compaired to the Red Domestic engines. Tried looking it up on the net but could not really find anything telling me the main differences. Thanks in advance.

    Richard
    95 SL750


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    The red domestic engines produce more power, and have larger cylinder displacements, than the blue Fuji engines.

    The two cylinder 700-800cc domestic twin engines produce the same or more power than the 'big' 780cc three cylinder Fuji.

    The smallest three cylinder domestic is 900cc, and Polaris quickly moved up to the 1050 and then 1165cc (aka '1200') triples as the standard three cylinder engine.

    The domestic crank shafts are more robust, with less tendancy to twist out of index than the Fuji cranks.

    Lots of other differences, big and small.

    The Pro 785 Fuji engine with exhaust valves and tuned triple pipe exhaust system is the exception, as it produced plenty of power. But that engine is not a recreational style engine, the power output is very non-linear.

  3. #3
    Firefighterarcher's Avatar
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    Thanks for the quick reply, was just wondering ever since I got my Sl 750 last year. Thanks.

  4. #4
    BBCaprice's Avatar
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    The domestics def make more power, but it has been my experience w/ both of them that Fujis seem to be more reliable. This will probably bring some rebukes but- them Keihin carbs suck; and not just gas. Also, the domestics seem to be plagued with elec issues. Right now my buddies 01 Virage is down due to a PTO crank seal that just disinegrated w/ less than 100 hrs. Granted, my 780 just cooked the cen piston but this was well after 300hrs (estimate-at least that) and this boat has been run HARD, I mean WOT for miles almost every time it goes out; which is every w/e. Love them 1200's, but we're always working on them

  5. #5
    Firefighterarcher's Avatar
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    Thanks BB, that's kind of what I have been hearing. That the Fujis seem to be more reliable, I'll keep my fingers crossed that my Fuji will run good for many summers. Thanks

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Domestics are made in the U.S.A., and the Fuji........ Japan.

    Most Domestics use a 81mm piston or slightly larger, with the Fuji using around a 71 mm piston.

    Typical American made products, bigger is better.

  7. #7
    way2much2do's Avatar
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    I've got one of each....one Fuji, one domestic. The Fuji has about 130 hours and it has been 100% reliable (well, 99% - I had to replace the regulator). Otherwise, it's never let me down.

    The domestic has about 90 hours on it and it's given me nothing but problems so far. Mostly seems like poor assembly quality. So far, I've found:

    1) Loose engine bed plate bolts
    2) Folded gasket installed on front stator cover leaking water
    3) Broken bolt in exhaust system
    4) Broken 3rd bolt holding EMM bracket to hull
    5) TBD, but I think I have a bad coil
    6) TBD, but I also think my TPS is bad

  8. #8
    Being dragged kicking and screaming into 1997 afcblink's Avatar
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    Forgive a stupid question from a non-Polaris guy...
    What years were the Fuji engines used, and which years used domestic?

  9. #9
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by afcblink View Post
    Forgive a stupid question from a non-Polaris guy...
    What years were the Fuji engines used, and which years used domestic?
    There was a few overlap years.
    1992 was the first year with Fuji engines, 1996 was the first year for the domestic engines.

    Full details are listed here;
    Polaris PWC related information

  10. #10
    Being dragged kicking and screaming into 1997 afcblink's Avatar
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    So, it's:

    650-785cc Triples = Fuji
    Twins & 900cc+ Triples = Domestic

    Is it as simple as that?

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