Just another silly Squarenose re-do - Page 5
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  1. #41
    PWCToday.com Is My Home Away From Home fox river pwc's Avatar
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    Re: Just another silly Squarenose re-do

    Ebox has been all gone through, and I swapped the 6r7 CDI for one of my spare 62t CDIs - higher rev limit and slightly improved timing curve down low (improves starting, according to Yamaha from way back when).

    Time for some motor alignment progress.
    The way the ski came to me, the coupler gap was about 5mm, and even sliding the motor as far back as possible it was still 4mm, which is about double what I'd like it to be. Several ways to correct this. My choice is to add a 3mm thick washer behind the midshaft coupler (visible in the pictures). This will allow me to close up the coupler gap without losing any of the driveshaft/midshaft spline engagement. And yes, of course I will perform the actual motor alignment with the rubber dampener removed.

    Perfect alignment is how you make things like couplers, dampeners, midshaft splines, driveshaft splines, midshaft bearings, pump bearings, crank bearings, and even motor mounts live their lives to the fullest extent
    It also helps to minimize vibration, which maximizes your riding enjoyment.
    I find it very easy to justify spending 2-3 hours aligning a motor for all of these reasons - plus the future repairs you avoid, or at least delay, take WAY longer than a couple of hours.


    20211019_122002.jpg20211019_122008.jpg


    WHEN IN DOUBT, GAS IT!

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  2. #42
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Just another silly Squarenose re-do

    I've never seen one yet that I couldn't bottom the couplers out on. Reckon at some point that somebody rebuilt the midshaft and pressed it in a bit too much?
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
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    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  3. #43
    Top Dog JC-SuperJet's Avatar
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    Re: Just another silly Squarenose re-do

    Sometimes Transom Landings will cause the Engine to impact the Coupler, hammering the Shaft deeper into the Housing. If the Motor Mounts survive, then there'll be a bigger Coupler Gap.

  4. #44
    PWCToday.com Is My Home Away From Home fox river pwc's Avatar
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    Re: Just another silly Squarenose re-do

    Yeah, I've seen a few similar to this one over the years.
    Had the midshaft out of this one, and press and spline engagement were both very good (so I didn't want to change them), so who knows? Bulkhead back a bit when the hull was made maybe?? Motor mounts are maybe just a bit forward, as the mounting holes being a bit oversized do allow for some "adjustment ". And this hull really shows evidence of being babied forever, but yeah, one hard landing is all it takes. Sure I could have pushed the midshaft forward 3mm, and that would have been fine as well. Overall, I just decided to go with the 3mm washer and push onward...

    This one is also needs a good amount of shim stacking, and with the variances I see from one SJ to the next, well, I guess I'm not surprised when I see one hull align differently than another, and I just select a way to get everything straight that will function correctly long term.

    But I appreciate the thoughts...


    WHEN IN DOUBT, GAS IT!

    Yeah, I'm an @sshole, but I'm not a complete @sshole.

    http://badgerlandjetpilots.com/

    I don't come here to make enemies - only to identify them...

  5. #45
    PWCToday.com Is My Home Away From Home fox river pwc's Avatar
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    Re: Just another silly Squarenose re-do

    Also, the shims in here were already marked with a sharpie as to their location, so we know the motor has been out before - probably when the 6m6 top case was clearanced to accept the 61x 701 cylinder


    WHEN IN DOUBT, GAS IT!

    Yeah, I'm an @sshole, but I'm not a complete @sshole.

    http://badgerlandjetpilots.com/

    I don't come here to make enemies - only to identify them...

  6. #46
    PWCToday.com Is My Home Away From Home fox river pwc's Avatar
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    Re: Just another silly Squarenose re-do

    2mm gap all the way around & straight.

    20211019_191848.jpg


    WHEN IN DOUBT, GAS IT!

    Yeah, I'm an @sshole, but I'm not a complete @sshole.

    http://badgerlandjetpilots.com/

    I don't come here to make enemies - only to identify them...

  7. #47
    PWCToday.com Is My Home Away From Home fox river pwc's Avatar
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    Re: Just another silly Squarenose re-do

    Turn plate bushings epoxied in place.

    20211019_193026.jpg


    WHEN IN DOUBT, GAS IT!

    Yeah, I'm an @sshole, but I'm not a complete @sshole.

    http://badgerlandjetpilots.com/

    I don't come here to make enemies - only to identify them...

  8. #48
    PWCToday.com Is My Home Away From Home fox river pwc's Avatar
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    Re: Just another silly Squarenose re-do

    Time to tackle this slop in the handlepole pivot.
    Push handlepole to one side.
    Fit the gap with pump shims.
    Measure the shims.
    Divide by two.
    Now I just need to find/make two derlin/nylon washers about 1.7mm thick each.

    20211019_192421.jpg20211019_192425.jpg20211019_192722.jpg20211019_192843.jpg


    WHEN IN DOUBT, GAS IT!

    Yeah, I'm an @sshole, but I'm not a complete @sshole.

    http://badgerlandjetpilots.com/

    I don't come here to make enemies - only to identify them...

  9. #49
    PWCToday.com Is My Home Away From Home fox river pwc's Avatar
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    Re: Just another silly Squarenose re-do

    Washers for eliminating the side to side handlepole slop.

    Local Menards has 20 pack of these nylon washers for about 2 bucks, so I picked some up last night. O.D. of 1.5" is perfect. I.D. is too small, but easily corrected with a drill. The thickness is just shy of 1.6mm, so roughly a tenth of a mm thinner than perfect, but should do the trick. We shall see.

    Screenshot_20211021-085206_Gmail.jpgScreenshot_20211021-085228_Gmail.jpg


    WHEN IN DOUBT, GAS IT!

    Yeah, I'm an @sshole, but I'm not a complete @sshole.

    http://badgerlandjetpilots.com/

    I don't come here to make enemies - only to identify them...

  10. #50
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Just another silly Squarenose re-do

    Everybody is thinkin' it......I'm gonna say it........SLOW the HELL down!!!! You're making the rest of us with builds look bad. LOL!!
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

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