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Thread: 780 vs 785

  1. #1
    I like 'em wet 'n fast! Chad's Avatar
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    Question

    I am not exactly sure if this is the right place or not, but here goes...

    I am doing some casual research to learn everything I can about Polaris skis, especially the 780s and 785s, and was wondering about something...is the 785 actually a 785cc engine, or is it still a 780cc engine, with the 5cc added to it to differentiate it from the regular SLX780s? If it is a 785cc engine, what was done to the 780 to get the extra 5ccs?

    Thanks in advance!


  2. #2
    Moderator beerdart's Avatar
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    The 785 is 779cc. It is a 750 bore with an extra 3mm stroke. It has exhaust valves and triple pipes and spins at 7800 rpm

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Well, you can start by looking at the 1992-1998 Service Manual, and the PRO supplement.

    The PRO 785 engine was a significant development from the base Fuji engines, and many things were changed. I think only a few moving parts interchange between the PRO and the 780.

    The PRO785 guys will be along soon, I am sure.

    Why have you focussed on those two Fuji models?

  4. #4
    I like 'em wet 'n fast! Chad's Avatar
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    Thanks!

    Yea, I downloaded the manual last night, and have just now started to read through it. I hope to get all the way through it (for the first time) in the next day or so, and will read as much data as I can get my hands on, or eyes on as it were.

    They are just 2 of the 3 that I really like, with the 3rd being the '97 SL1050 (white/yllow). I like the look and feel of them, the hull and deck design, the performance, and things like that. I like to keep everything I have visually stock, and the '96 SLX780, red/black PRO785, & white/yellow SL1050 are my favorites in the style department...as well as being excellent performers.

    I want to learn about all of the Fuji/Domestic engines, and all of the different boats, but want to put most of my learning on the ones I like, which will be the ones I am going to be dealing with.

  5. #5
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by Chad View Post
    I am not exactly sure if this is the right place or not, but here goes...

    I am doing some casual research to learn everything I can about Polaris skis, especially the 780s and 785s, and was wondering about something...is the 785 actually a 785cc engine, or is it still a 780cc engine, with the 5cc added to it to differentiate it from the regular SLX780s? If it is a 785cc engine, what was done to the 780 to get the extra 5ccs?

    Thanks in advance!
    the pipes,exh.valves,bigger carbs,better timing (cdi)--made for a huge gain in power ...from around 90-95 HP to about 130-140HP ,,,,huge leap for a 2 stoke power gain,,,BUT it(the motor) has no soft side to it.
    it has 3 speeds idle,lean back ready to go, and haul assssssssss
    refered to as (a light switch throttle) fast or slow you pick witch one you like
    i have wantded to put a 750 or 780 top end on a 785 bottom and crank
    but dont want to risk the pricy(785)parts----i think that would be a mini monster there
    mattman

  6. #6
    I like 'em wet 'n fast! Chad's Avatar
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    Sweet, my kind of ski! I grew up riding 2-stroke dirtbikes, and raced competitively from '83-'94 (motocross & supercross), so I know my way around a 2-stroke engine...and like a very pipey engine (stop or wfo)!

  7. #7
    crxski's Avatar
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    Quote Originally Posted by Chad View Post
    Thanks!

    Yea, I downloaded the manual last night, and have just now started to read through it. I hope to get all the way through it (for the first time) in the next day or so, and will read as much data as I can get my hands on, or eyes on as it were.

    They are just 2 of the 3 that I really like, with the 3rd being the '97 SL1050 (white/yllow). I like the look and feel of them, the hull and deck design, the performance, and things like that. I like to keep everything I have visually stock, and the '96 SLX780, red/black PRO785, & white/yellow SL1050 are my favorites in the style department...as well as being excellent performers.

    I want to learn about all of the Fuji/Domestic engines, and all of the different boats, but want to put most of my learning on the ones I like, which will be the ones I am going to be dealing with.
    I love the same ski's, all good choices!

  8. #8
    Moderated GPRXPJared's Avatar
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    mu old 785p
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  9. #9
    Moderated GPRXPJared's Avatar
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    nice huh

  10. #10
    I'D RATHER SWEAT THAN SHIVER hyoctane23's Avatar
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    Quote Originally Posted by GPR RIDER View Post
    nice huh
    That is a nice boat. I had another picture of yours on my comptuer and it made me fall in love with the '00 style, but I ended up with a '98 that has grown on me a lot.

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