Best Mods for a js550
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  1. #1
    PWCToday Newbie sorewil's Avatar
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    Best Mods for a js550

    I have a '86 js550 with a Mariner water box, Ride plate (also mariner) and want to upgrade it some more. What are some mods that aren't to pricey but are worth it? Is a pipe or half pipe more or less restrictive than the OEM breadbox exhaust.

    Thanks!
    '86 Kawasaki js550
    Mariner ride plate
    Quick turn
    Mariner waterbox

  2. #2
    Frequent Poster Zreno's Avatar
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    Re: Best Mods for a js550

    Go with a half pipe if you get one. Milling the head is pretty cheap
    83 550/750
    91 X2 750
    86 X2

  3. #3
    PWCToday Newbie sorewil's Avatar
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    Re: Best Mods for a js550

    Thanks for the info.
    '86 Kawasaki js550
    Mariner ride plate
    Quick turn
    Mariner waterbox

  4. #4
    PWCToday Regular CALJET's Avatar
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    Re: Best Mods for a js550

    PJS back in the day claimed their half pipe made 13% more HP. I think any half-pipe and SS impellor would wake up your ski nicely.
    1998 Yamaha GP1200 - stock
    1987 Kawasaki X2 - few bolt ons
    2004 Seadoo 3D - stock

  5. #5
    PWCToday Newbie sorewil's Avatar
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    Re: Best Mods for a js550

    Thanks.
    '86 Kawasaki js550
    Mariner ride plate
    Quick turn
    Mariner waterbox

  6. #6
    PWCToday Guru
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    Re: Best Mods for a js550

    1. Stainless Skat impeller, 15.5 or 13-16
    2. Half pipe
    3. Mill/rechamber head for 170-175 compression
    4. Advance timing (free mod, with the know how)

  7. #7
    PWCToday Newbie sorewil's Avatar
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    Re: Best Mods for a js550

    I am getting a lot of these
    -milled head
    -half-pipe
    -impeller

    Thanks all for the help.
    '86 Kawasaki js550
    Mariner ride plate
    Quick turn
    Mariner waterbox

  8. #8
    I dream skis jetbum's Avatar
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    Re: Best Mods for a js550

    I've had good luck a light port and polish, it's a bit of work but if you take the time you have have decent results which don't affect reliability of the motor. I found all the specs on here. An air filter and choke removal, primer kit install as well, opens up the carb and let's more air in. Adding a sbn44 carb is a good investment. Found jetting specs o. The site as well. The ski was a great running 550. I hope this helps. There are lots of guys on here that know there stuff
    Officially done owning skis but I still like reliving the old days

  9. #9
    PWCToday Newbie sorewil's Avatar
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    Re: Best Mods for a js550

    Ok thanks For the information.
    '86 Kawasaki js550
    Mariner ride plate
    Quick turn
    Mariner waterbox

  10. #10
    PWCToday Regular Lowflyin's Avatar
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    Re: Best Mods for a js550

    5 bars and finger throttle are some of my favs

    Sent from my LM-V600 using Tapatalk
    ~'94 550sx
    ~'09 Yz450
    ~'04 400ex
    ~'46 J-3 Piper Cub

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