550/750 winter cleanup
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  1. #1
    Frequent Poster Zreno's Avatar
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    550/750 winter cleanup

    2EB39331-1BA6-448C-8349-4F4F2CD477D7.jpegSo last summer I built this conversion with a 750 small pin. Ran most of the summer with dual 40 keihins. Threw a 29cc westcoast head on hoping for higher comp than my stock milled head but stayed dead at 150. (I’m at 4500 feet) The ski had a team Butch pipe and a jet sport aluminum waterbox. I also threw in a timing advance from John zigler along with many other parts on the ski, conversion plate, ebox plate, quick steer and a couple others I’m forgetting. I also picked up a bored and blueprinted pump and put a brand new skat 18 in. The ski was tons of fun but next summer I’m hoping to get a little more out of it. So I’m picking up a 94 750sx with a group k ported engine and gonna shine that up and do some painting to make it pretty, I’ll also be swapping to a coffmans 3 piece, supertrapp waterbox, moving exhaust exit to right front below the rail, and swapping to a single sbn44 on westcoast manifold to help out my bottom end. I’m planning to run a 3738 cdi if it’s safe with the timing advance and hoping to have this thing ripping. My engine bay got pretty dirty towards the end of the season so while everything is out I’ll be spraying that white. Here’s a couple pictures with the engine being the last thing ready to pull out!
    Attached Images Attached Images
    Last edited by Zreno; 12-21-2020 at 07:32 PM.
    83 550/750
    91 X2 750
    86 X2

  2. #2
    PWCToday.com Is My Home Away From Home BLRider's Avatar
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    Re: 550/750 winter cleanup

    S u b s c r I b e d !
    Never argue with an idiot, they will drag you down to their level then beat you with experience.

  3. #3
    Frequent Poster Zreno's Avatar
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    Re: 550/750 winter cleanup

    Picked up a pretty clean 92 750sx last night with a group k sleeper in it. Gonna check the compression and see if I wanna keep the head or put my westcoast head on. Planning to swap this engine into my 550 hull and take the stock 750 from that to replace this one.CF8C6582-9770-463D-8984-8E19699DF762.jpegCF8C6582-9770-463D-8984-8E19699DF762.jpeg The head is tapped for dual cooling but the second line just goes straight out the pisser. Is this okay to run like that? And would I just plug the second hole if using single cooling and a Coffman with three barbs on the head pipe? Blrider is helping me out with a cdi since I toasted mine. Garage is pretty stuffed now too hahaE4571B90-749E-4A9B-99D9-7985BD126253.jpeg1E0003EF-A0D0-4B23-B4D7-B862AEEF6DAB.jpegB1CED496-4BA9-4EAF-9BB0-5C9512E88806.jpeg
    83 550/750
    91 X2 750
    86 X2

  4. #4
    Frequent Poster Zreno's Avatar
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    Re: 550/750 winter cleanup

    Check the compression on the 750 and initially got 145/160. Re tested and got 150/160. Tested once more and got 160/165. Gonna pull the head off to check it out and see how the cylinders look, maybe do rings. Painted the diaphragm cover for my carb haha, have been pretty busy with school and work not much time to work on skis lately 074AA53B-9E72-48B9-92B4-0B2DBF795151.jpeg
    83 550/750
    91 X2 750
    86 X2

  5. #5
    PWCToday Newbie
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    Re: 550/750 winter cleanup

    How did it run on the 18 impellar and 550 pump. Were you satisifed?

  6. #6
    Frequent Poster Zreno's Avatar
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    Re: 550/750 winter cleanup

    It was awesome with the dual 40 keihins! Ski had crazy mid to top end and would pull on my buddys 650(only thing I had to compare it to). Then I started fiddling with carbs and spent the rest of my summer tuning a slower ski that was just fine to start with haha. The impeller was great though I’m hoping it’ll give me some good bottom end with the single sbn44. The reason I went with an 18 instead of a 19-21 like a lot of conversion guys are running is because of the elevation I’m at too. The lowest lake I ride at is about 4500 ft and the other is 5600
    83 550/750
    91 X2 750
    86 X2

  7. #7
    Frequent Poster
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    Re: 550/750 winter cleanup

    Quote Originally Posted by Zreno View Post
    Picked up a pretty clean 92 750sx last night with a group k sleeper in it. Gonna check the compression and see if I wanna keep the head or put my westcoast head on. Planning to swap this engine into my 550 hull and take the stock 750 from that to replace this one.CF8C6582-9770-463D-8984-8E19699DF762.jpegCF8C6582-9770-463D-8984-8E19699DF762.jpeg The head is tapped for dual cooling but the second line just goes straight out the pisser. Is this okay to run like that? And would I just plug the second hole if using single cooling and a Coffman with three barbs on the head pipe? Blrider is helping me out with a cdi since I toasted mine. Garage is pretty stuffed now too hahaE4571B90-749E-4A9B-99D9-7985BD126253.jpeg1E0003EF-A0D0-4B23-B4D7-B862AEEF6DAB.jpegB1CED496-4BA9-4EAF-9BB0-5C9512E88806.jpeg
    holy ****, look at that garage! jelly!

    edit**** jetskijabronies, lol hell yea
    Last edited by CA550sx123; 01-01-2021 at 04:59 PM.

  8. #8
    Frequent Poster Zreno's Avatar
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    Re: 550/750 winter cleanup

    Quote Originally Posted by CA550sx123 View Post
    holy ****, look at that garage! jelly!

    edit**** jetskijabronies, lol hell yea

    Haha yeah picked up that x2 from him to steal the engine out of and build my wife’s 750x2
    Gonna sell that hull with a stock 650
    83 550/750
    91 X2 750
    86 X2

  9. #9
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    Re: 550/750 winter cleanup

    Quote Originally Posted by Zreno View Post
    Haha yeah picked up that x2 from him to steal the engine out of and build my wife’s 750x2
    Gonna sell that hull with a stock 650
    im interested in a stock x2, where ya located?

  10. #10
    Frequent Poster Zreno's Avatar
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    Re: 550/750 winter cleanup

    Reno nv, hull is pretty clean and the engine has a sbn44 on it I think
    83 550/750
    91 X2 750
    86 X2

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