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  1. #1
    PWCToday Regular goaty's Avatar
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    performance difference between 440 and 550

    I know this is a lame question , but here goes. I was going to build a 550 from a basket case but crank bad and no title means no bueno. i have a 440 that is real clean so i was thinking about putting all the 550 stuff into that and stealing that crank but i want to know if there is a significant perfomance differance between a stock 440 and a stock 550?

  2. #2
    PWCToday.com Is My Home Away From Home MrSki's Avatar
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    Re: performance difference between 440 and 550

    Remember this my young skywalker - there is no replacement for displacement! More cc=more power, period.

    That said, my stock 550 got smacked by a stage 3 440 at L Tahoe about 1990 or so. So it all depends. but if you are going to invest in mods, go 550.
    1992 550 SX - R&R port Kawi Reed, Kind of fast.
    1989 JS 550 - PJS motor Dual 46's, 50 MPH on GPS.
    1986 JS 550 - Engine built. On to fiberglass!
    1976 JS 400 - Pretty much just a shell.

  3. #3
    resident guru 550 SLUT's Avatar
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    Re: performance difference between 440 and 550

    yep 100cc more
    YES THAT IS A SEAL DRINKING BEER ON A BOAT

  4. #4
    PWCToday Regular goaty's Avatar
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    Re: performance difference between 440 and 550

    well , is it worth spending a couple hundred to do it, i need a top end kit , bore cyl, and new impeller tocomplete it or maybee save on the impeller and just keep the 440 pump but dont know if i really want to do that.

  5. #5
    PWCToday.com Is My Home Away From Home delagem's Avatar
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    Re: performance difference between 440 and 550

    Just a thought, I live in New York, which is probably one of the more restrictive states regarding registering vehicles. I was able to register 2 skis that came with basically no paperwork whatsoever, it just took a bit of time and some forms to fill out. So maybe your 550 isn't done yet...

    I'm also in the middle of a 440 to 550 conversion. A cracked cylinder forced me to buy another, so I just sprung for the bigger bore.

  6. #6

    Re: performance difference between 440 and 550

    Bro, you are singing my song from way back. I had a 550 in my 440 hull back in 1984.

    You want the 550 engine with the 440 pump. (axial flow pump)

    That old 440 has a cast iron block. Even the primitive piston port style of the pre-1991 550's ,is better than a 440.

  7. #7
    PWCToday Regular goaty's Avatar
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    Re: performance difference between 440 and 550

    should i still use that 440 15.5 jetlyne impeller with the 550 engine? and how critical are the sponsons, should i move them from my junky 550 to my clean 44 that willbecome a 550.

  8. #8
    resident guru 550 SLUT's Avatar
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    Re: performance difference between 440 and 550

    yep that is fine 15.5
    YES THAT IS A SEAL DRINKING BEER ON A BOAT

  9. #9
    Banned
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    Re: performance difference between 440 and 550

    theres not a whole lot of difference.

    its the difference between a little power and a tiny bit more power.

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