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Thread: New JS440 owner

  1. #11
    I dream skis Bionic racing's Avatar
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    Re: New JS440 owner

    Yes on measure bore next step , pop head then you will know for sure , my bad on 550a it should say 530a , been a long day , 550 has 75mm bore for std size , you have a 550 pump if it has hex plug instead of grease fitting , a 440 engine will barely move a 550 pump , been there done that a long time ago , so next step check bore , more than likely it's a 550 , keep fingers crossed and get busy

  2. #12
    PWCToday Newbie rhyno857's Avatar
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    Re: New JS440 owner

    Thanks a lot for everyone's help. I'll get my telescoping gauges out today and pop the head.
    Last edited by rhyno857; 11-02-2017 at 05:42 AM.

  3. #13
    I dream skis Bionic racing's Avatar
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    Re: New JS440 owner

    When you find out if a 440 or 550 then you can start to get correct A/M parts to make her go a little better , impellor , build that carb , etc , hope it's a 550 , will make things way simpler

  4. #14
    PWCToday Newbie rhyno857's Avatar
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    Re: New JS440 owner

    I popped the head off and I'm measuring the bores 77mm so I'm assuming it's a 550 2mm over bore? The carb is a BN 44 so that makes sense why it would be on a 550. There is a pretty big score on one of the cylinder walls. The Pistons look relatively new but there is more side to side play between the piston and cylinder then I think should be there. Is this jug usable or should I be hunting for a replacement? IMG_20171102_163039.jpg
    IMG_20171102_163145.jpg

  5. #15
    PWCToday Newbie delta rat's Avatar
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    Re: New JS440 owner

    That Jug is toast. They shouldn't even be used at 77mm. Find one at stock or .5 over if you want to build a pp 550, they start to have problems past 1mm over.
    Last edited by delta rat; 11-02-2017 at 04:56 PM.
    '78 js 440 superstock PJS 2400 pipe, pjs extended tank, skat 16
    '87 650sx handling mods, skat 15.5
    '89 550-650 40mm keihin, pipe mod, supertrapp, skat 17
    '90 550-750 (project) 750 SP, Coffman's pipe, Factory waterbox, RHASS 750 pump kit, Hooker 9/15

  6. #16
    I dream skis Bionic racing's Avatar
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    Re: New JS440 owner

    That head looks sketchy also , affirmative on above post , well at least it's a 550 all the way , just wore out , so now ya know

  7. #17
    PWCToday Newbie rhyno857's Avatar
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    Re: New JS440 owner

    Yeah, that's a bonus. I had plans on replacing the 440 jug for a 550 when I thought it was a 440 so it doesn't hurt too much. Something was definitely bouncing around in that head at one point. Do you think it's salvageable or should I just look for a new head as well? Know of a good place to find parts? Thanks for all your expertise, got me on the right track pretty fast.

  8. #18
    I dream skis Bionic racing's Avatar
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    Re: New JS440 owner

    Was the head dammage on front cylinder ? If so strip bottom end to the crank , you will find the bearing on front of cranks bearing retaining cage is gone , that is what pitted tha head when that came thru the transfer ports , common , if crank is still good you can just press a new main bearing on your crank , time to get busy again

  9. #19
    PWCToday Newbie rhyno857's Avatar
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    Re: New JS440 owner

    It was the front cylinder but the was no damage to the pistons so I'm assuming it happened before the top end rebuild. The same gasket maker is used on the crankcase so I'm assuming it was a complete rebuild at one time so hopefully that was fixed (but Murphy' law). I looked up the pistons and they are Weisco 77mm big bore pistons that look pretty new so hopefully the crank is good.

  10. #20
    I dream skis Bionic racing's Avatar
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    Re: New JS440 owner

    Double check that front main or you may wipe out the next top end , check your want to buy post also , you only want to do this one time , this ski started and ran just bogged ? If so that's good then I won't have to walk you through electrical diagnostics also , soon you will be a certified 550 mechanic , all of these are common problems on those 2x4 skis

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