88 JS550 Start before rebuild? - Page 2

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  1. #11
    Frequent Poster heresjohnny151's Avatar
    Join Date
    May 2008
    brea, california

    Re: 88 JS550 Start before rebuild?

    Once you get it running, a few quick easy mods will help your ski run like it was meant too. (1)- advance the timing all the way (32 degrees). (2)- Plug the rev-limiter and install a restrictor jet into the return line. (3)- Have the head milled 55 thous. These mods are going to make it start easier, run better, and be more consistent.
    Last edited by heresjohnny151; 12-11-2017 at 07:58 PM.

  2. #12
    PWCToday Newbie
    Join Date
    Oct 2017

    Re: 88 JS550 Start before rebuild?

    I have the same deal I found a stock 83 js550 that hasn't run in a long time looks like everything is stock the carb is a mess all the gaskets where garbage, The carb spacer was made out of wood ?? so I need to order some parts Carb kit ,gaskets, spacer,new gas lines and fuel separator ,
    so I took off the REV Limiter pull the wires out and capped it off waiting on parts with the carb soaking
    I did a compression check with fogging oil PTO 140 Mag 145 I think I hit the jack pot on the compression I'm not sure about the Crank seals? my plan is to run it and then pull the engine for complete paint job ?what carb is this ?IMG_0342.JPGIMG_0342.JPGIMG_0343.JPGIMG_0344.JPG
    Last edited by stick21; 02-25-2018 at 09:16 PM.

  3. #13
    PWCToday.com Is My Home Away From Home BLRider's Avatar
    Join Date
    Apr 2007
    SE MI

    Re: 88 JS550 Start before rebuild?

    That is a Mikuni 38mm BN carb.
    Never argue with an idiot, they will drag you down to their level then beat you with experience.

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