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  1. #261
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: FOG's 550/750 Build

    Wow that sucks. I don't think I've ever heard of a head pipe just spontaneously breaking like that.

    Keep up the good work FOG. I need to get on the rebuild of my ski.
    1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
    2009 1100 SJ:
    Kawi 1100 build in progress
    2009 SJ MINT:
    KP steering adaptor, Worx 228 intake, PWR ride plate [47.3mph gps]
    1987 WJ650:
    6M6, JD Intake Grate, 17/20, Coffmans Sizzler [48.5mph gps]
    1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
    1995 SJ MINT:
    Worx 205 intake [42.5mph gps]



  2. #262
    Top Dog FOG's Avatar
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    May 2004
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    Mesquite, NV
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    1,335

    Re: FOG's 550/750 Build

    I got the ski to the water for the fourth time this year! Dropped the pilot jet from 120 to 117.5 and attempted the drop idle test again...still on rich side. So I set the idle/low screw to positions that seemed best and rode for the day. It made for a fun day with the wife on her conversion ski and not many people on the water. Ski is just shy of being really crisp (throttle response) at low/mid ranges. Hoping smaller pilot jet will get it where I want it.

    I was getting ready to take my last ride and I took the hood off to see if I needed gas. The top of the tank was wet with fuel. The tank had developed a crack on the top, side to side. So, We packed up and headed home.

    BLRider offered a tank so that is on the way. Outstanding offer...I'll make sure to address that. Regardless, thank you so much, Kurt.

    While 'under the hood' dealing with the tank removal, I also removed the carb and re-jetted the pilot to 115. I'll give that a try next time out.
    I'll quit before I sit~~~

  3. #263
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: FOG's 550/750 Build

    Sounds good FOG, keep up the good work.

    Just for reference in case it might be useful for everyone, we just data logged critracer's (John's) 550/750 dual carb this past weekend. My brother got a Aim mychron 5 kart data logger a few years ago in order to tune his Judge ported mod 1100 sxr. It has been so useful to get gps speed and rpm. We were never able to do mine before it developed some severe cracks. His ski is nearly identical to mine. Limited 750 dual carb, Keihin CDK2s with my jetting, Coffmans big pipe, small pin CDI, 20 pitch impeller, 69mm nozzle. The only difference to mine was he's got a top loader, as he prefers the feel of it. I always used the Westcoast deep scoop type 2 bar.

    His ski was at 48.5mph @ 6900-6950 RPM. Best I did with the small pin CDI was 49.9, and once I switched to the big pin CDI 50.3. At that point I switched to the 750 pump. John is going to change intake grates and see what difference that makes. It's clear his Coffman pipe makes more low to mid than mine did with the PJS pipe on the same set up. We just need to try a few things to get his rpm up a bit more. He's also thinking of the 750 pump swap too.

    With these 550 builds it has always been pretty tricky to get reliable rpm info. Once I get my ski built back up in its new hull I'm excited to try data logging it.
    Last edited by theVetteman3; 09-23-2021 at 07:14 AM.
    1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
    2009 1100 SJ:
    Kawi 1100 build in progress
    2009 SJ MINT:
    KP steering adaptor, Worx 228 intake, PWR ride plate [47.3mph gps]
    1987 WJ650:
    6M6, JD Intake Grate, 17/20, Coffmans Sizzler [48.5mph gps]
    1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
    1995 SJ MINT:
    Worx 205 intake [42.5mph gps]



  4. #264

    FOG's 550/750 Build

    Ive always used a tiny tach. Works well for me. Cant beat it for the price and i have on on a ski i sold 8 years ago and owned it for another 7 years. Itís still going. Always put one on a new ski/build/motor. Hours plus tach and max rpm.
    Maybe i should switch over?

    Holy S#!t! Just checked them out. ALOT different then a tiny tach! Are they waterproof? Can we use the EGT? Looks really sweet except the price tagÖ


    Sent from my iPad using Tapatalk
    Last edited by 550headache; 09-27-2021 at 08:26 AM.
    1995 FX-1: Pro-Tec chamber~Skat swirl~Pro-Tec plate~Blowsion Destroyers

    1990 Square Nose: Blue ported Jetmaniac 718~#ZERO lightened/drilled flywheel~ADA girdled/32cc~701 B pipe/flow control~Hooker 9-15~AAA pole~Pro-Tec rideplate~Tom21 Tubbies and nose piece

    2014 Super jet waiting on a B pipe and Hooker....

  5. #265
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: FOG's 550/750 Build

    no the AIM mychron 5 type data loggers aren't water proof. My brother took a waterproof box and added ports to route the wires through. We have it securely strapped to the ski, and have a safety loop. I'm pretty sure we've tested the box floats too. But, we just don't get it wet. Even when riding with it on, I make sure to ride conservatively enough to not risk dipping it.

    You can use EGT I believe. There's all sorts of sensors and capabilities of that device, it's insane. One crazy example, we're in the process of trying to get approval for a buoy course at our regular lake. As a part of the application, the DNR requested we mark our course on a map with GPS approximate coordinates of the buoy locations. Well we put the data logger on my superjet and I went and ran the buoys, making a circle around each one. The end result was a perfect representation of our track and where the buoys were located. My runs traced perfect lines around the course and nice circles around the buoys. My brother brought that data into Google earth and had a nice representation of our course. He was able to fairly precisely mark the buoy locations from that.
    1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
    2009 1100 SJ:
    Kawi 1100 build in progress
    2009 SJ MINT:
    KP steering adaptor, Worx 228 intake, PWR ride plate [47.3mph gps]
    1987 WJ650:
    6M6, JD Intake Grate, 17/20, Coffmans Sizzler [48.5mph gps]
    1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
    1995 SJ MINT:
    Worx 205 intake [42.5mph gps]



  6. #266

    Re: FOG's 550/750 Build

    NICE!


    Sent from my iPad using Tapatalk
    1995 FX-1: Pro-Tec chamber~Skat swirl~Pro-Tec plate~Blowsion Destroyers

    1990 Square Nose: Blue ported Jetmaniac 718~#ZERO lightened/drilled flywheel~ADA girdled/32cc~701 B pipe/flow control~Hooker 9-15~AAA pole~Pro-Tec rideplate~Tom21 Tubbies and nose piece

    2014 Super jet waiting on a B pipe and Hooker....

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