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  1. #1
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Seadoo crank question

    I need to get a crank for my 717/720. I've taken apart several SBT engines due to failed "China" crank bearings. Are you currently using those, or have you switched to a "Nachi" or other brand?
    Last edited by Myself; 06-22-2015 at 01:53 PM.
    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

  2. #2
    PWCToday Regular SBT-Tech's Avatar
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    May 2014
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    Clearwater Florida
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    Re: Seadoo crank question

    SBT has used Nachi, Peer, and other bearings from various manufacturing plants (Nachi builds in China and other locations, Peer in China and Brazil, others throughout the world) when we’ve had supply issues. What we’ve found is performance of bearings is tied to quality control, not manufacturing site or manufacturer. SBT is able to control our suppliers bearing quality whereas we have little control of other manufacturers (case in point, with some of the previous mentioned suppliers we had found issues, documented the issues, were forced into 100% sorting and then were told their data said they were fine and to pound sand – we tossed shipments of bearings since we could not get them corrected).

    So to answer your question we use our own suppliers, have an incoming quality department that inspects every batch, and have shipped over 1 million bearings. We are very confident in our bearings.

    It is far more likely that the failures were due to fuel/oil/water issues leading to bearing failure and the bearing manufacturers/manufacture locations were not a factor. If they were we would see a rash of warranty for bearing failures from the volume of bearings we use. We have not. In fact our cranks are used by various high performance shops because they have confidence in our cranks/bearings (they buy cranks and parts since our engines are OEM replacement power and they are building higher powered engines).

  3. #3
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Seadoo crank question

    Thank you for the reply. I have used too many of your parts over the last 10 years to count. In fact, almost all parts sent to the Gassville, AR location are for me which includes the latest Yamaha 800 stuff. I also have had no issues thus far. I was just worried as two different motors I've torn down recently were both low hours since the installation of the engine (not by me) and they were past the warranty period. Both had bearing failures, one with a cage coming apart and thrashing a piston and cylinder, the other with a vibration that turned out to be a fractured race that had not come apart yet.
    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

  4. #4
    PWCToday Guru Dan87951's Avatar
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    Jun 2004
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    Lansing, MI
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    Re: Seadoo crank question

    My Sea Doo 787 SBT crank sees 7k RPMs every summer. Crank is now 3 seasons old and still running strong.

    I just wish SBT offered more products for Tigersharks. I sure could use a reasonably priced wear ring for my 97' Daytona 1000.
    04' Shorelander Double Trailer
    98' Sea Doo SPX Mint
    96' Sea Doo HX Mint
    95' Sea Doo XP800 Mint
    95' Sea Doo XP800 - Rescue project (almost done)
    99' Sea Doo XPL - rescue (project on hold)
    97' Tigershark Daytona 1000 - Another rescue project (see videos below)
    My Jet Ski videos below.
    https://www.youtube.com/playlist?lis...wmp0jqpvLFpgmZ

  5. #5
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Seadoo crank question

    I'm not sure what's happened the last few years but I wouldn't trust one of those cranks these days. Just had another one in a Kawi 900 that didn't make it through the season and it was a warranty replacement engine that had run out of warranty. Front main bearing came apart, ate up the front seal, and ran the engine lean (which also had excessive piston/cyl clearances) ruining almost everything. Only marking on the bearings was "CHINA".
    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

  6. #6
    PWCToday.com Is My Home Away From Home
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    Re: Seadoo crank question

    Unrelated to SBT, but I just rebuilt a bridgeport J head. Spent more time fishing out the pieces of china bearings than I did on the actual job. Guy had a professional tool builder refurb the head about a month ago, using china stuff. Less than 20 hours on it, at speeds less than 2720 rpm (fastest setting for this J head) with no lateral force on them. Blew completely apart. Luckily no collateral damage.
    I get all bearings from the electric motor shop next door. They will not use china sh!t, ever. Too many issues. German or Japanese only. (The owner of the mill said it never ran that quietly or smoothly before.)
    Just my little tale of woe with chinese bearings. Eggrolls, on the other hand, not doing German on them.
    Last edited by whazguude; 06-11-2018 at 03:37 PM.
    I'm only here to make you mad



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