1977 JS440 or????
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  1. #1
    PWCToday Newbie Ryanpb68's Avatar
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    1977 JS440 or????

    Okay so i got this ski on trade for a milwaukee 12v set i haven't used in over a year. so pretty sweet deal. figured the only way i was ever going to get to ride a stand up was to own one. i love fixing things. so i traded. sticker said last reg. 03 dude said hes had it for 10 years in his garage and never messed with. needs a ride plate and intake i ordered off ebay 50 bucks shipped. So dude said it was a JS550 but didn't know the year. and the hull numbers say its a 77 which means its a 440 correct? attached are some pictures of the engine and after market parts. no numbers on the engine except on the flywheel cover. So what is this thing why would someone take out the gas cap on top? what do i do lol ? is it a frankenstein? ?

    so i go through the motions on getting it up and running. new battery sprayed some wd40 in the cylinders let it sit for little bit. hit the start button and the thing turned over. i was tickled pink. so i said lets see if it has compression. holy crap its 150psi on both cylinders so now im super excited. so i dumped some gas in to see what it will do cause it also had spark on both plugs sooooo. Vroom Vroom the thing started up holy cow. now for new fuel lines a carb rebuilt and???? any pointers on howtos and what to dos Thanks im in mansfield ohio anyone near me?
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  2. #2
    PWCToday.com Is My Home Away From Home BLRider's Avatar
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    Re: 1977 JS440 or????

    Well, it's for sure got a 440 pipe, the cylinders could be either 440 or 550, only measurement will tell. T
    Hood looks like it's off of s 89/90 ski. I'd fill the tank and try it the way it is, specially if you are going to change them anyway.

    Let er rip!
    Never argue with an idiot, they will drag you down to their level then beat you with experience.

  3. #3
    PWCToday.com Is My Home Away From Home
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    Re: 1977 JS440 or????

    Yours has a few mods -- and it's extremely common for these models to get modified. BLRider is correct in that the only way to know if the engine is a 440 or 550 is to measure the cylinders or pistons. Even if the plate on the flywheel housing indicates the displacement it is quite likely that the top end has been replaced with a different size. The jet pump could be either an axial or radial flow pump because those get swapped too.

    I recommend you change the fuel lines, fill 'er up, give it a test ride, then see how it performs before rebuilding or changing the carb. A lot of new owners get their hands on a ski that has been sitting for decades, just put in fresh fuel and a new battery, then find out it runs great.
    Riding mostly Lake Austin

    1984 JS440 -- 1989 650sx -- 1991 X2 -- 1992 750sx -- 1995 900zxi (qty 2) -- 1995 X2

    Quote Originally Posted by cujo View Post
    God intended PWC to be two strokes, as well as dirt bikes, snowmobiles, and chain saws....

  4. #4
    PWCToday Newbie Ryanpb68's Avatar
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    Re: 1977 JS440 or????

    Thanks guys. Any idea on the gas tank and what i should do ?

  5. #5
    PWCToday.com Is My Home Away From Home
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    Re: 1977 JS440 or????

    Did it not come with a fuel tank? Some owners fill in the body where the cap normally goes and then fill the fuel tank internally with the hood off. Generally a bad idea because it is not only inconvenient but spilled gas then goes into the hull where it has a greater tendency to explode when you crank the starter.
    Riding mostly Lake Austin

    1984 JS440 -- 1989 650sx -- 1991 X2 -- 1992 750sx -- 1995 900zxi (qty 2) -- 1995 X2

    Quote Originally Posted by cujo View Post
    God intended PWC to be two strokes, as well as dirt bikes, snowmobiles, and chain saws....

  6. #6
    PWCToday.com Is My Home Away From Home JSNate's Avatar
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    Re: 1977 JS440 or????

    I have an OEM JS fuel tank in my parts stash. I would sell it for $40 plus shipping.
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    Last edited by JSNate; 08-27-2018 at 02:31 PM.

  7. #7
    PWCToday Newbie Ryanpb68's Avatar
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    Re: 1977 JS440 or????

    yeah they filled the hull in. and yes i have a tank just wondering how to put a makeshift fill hose and cap on it so i can fill the tank up more then 2 thirds

  8. #8
    I dream skis E350's Avatar
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    Re: 1977 JS440 or????

    Quote Originally Posted by linkman View Post
    Did it not come with a fuel tank? Some owners fill in the body where the cap normally goes and then fill the fuel tank internally with the hood off. Generally a bad idea because it is not only inconvenient but spilled gas then goes into the hull where it has a greater tendency to explode when you crank the starter.
    Or maybe even start the bilge pump?

    I always wondered about that. Especially since I am prone to missing or overfilling...
    Learning Slowly...

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