Fx140 starter voltage drop - No Start
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  1. #1
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    Fx140 starter voltage drop - No Start

    Hey there! Last month our Fx140 wouldn't start after hitting a big wave. I suspect the starter but since it's a pain the rear to get out, I'm doing my due diligence for diagnostics before removing starter. Any troubleshooting tech tips would be appreciated.
    What we know:
    • Battery is charged and load tested fine at O'Reilly's
    • Starting relay clicks every time when start button pressed; sometimes starter makes a little noise but doesn't actually spin at all.
    • 12.4v on Battery side of relay
    • only 5.6v on starter side of relay!!
    • Ground from battery to starter feels solidly connected to starter
    • Positive lead from relay to starter feels solidly connected to starter
    • Checked relay without battery of starter connected and full continuity and only 0.06ohms resistance when relay closed with starter button.
    • Replaced relay with a cheap aftermarket version for $15 diagnostic test and same result.
    • Used screwdriver to jump battery side of relay to starter side and I get the same result; no spin and maybe a little noise.
    • Obviously I'm getting a HUGE voltage drop across relay when I press the button.

    My thoughts are MAYBE the relays are bad, but I think the starter crapped out and I'm getting a short of some sort that's grounding my 12v to the block.
    Any ideas????
    Thanks!

  2. #2
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: Fx140 starter voltage drop - No Start

    Sounds to me like your starter crapped out and is sucking all the voltage
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    WWSRD , What would Speed Racer do ?

  3. #3
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Fx140 starter voltage drop - No Start

    Quote Originally Posted by WFO Speedracer View Post
    Sounds to me like your starter crapped out and is sucking all the voltage
    I have to agree.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
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    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

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  4. #4
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    Re: Fx140 starter voltage drop - No Start

    Well, I pulled the starter this afternoon and bench tested it. It’s strong and powerful. Scratched my head and then went and pulled the sparkplugs. Tried to spin the coupler with a big pipe wrench and it spins about 20 degrees and then stops solid. Tried to spin the other way and it moves 20 degrees and stops solid. I think the engine is blown. Kids were riding and hit the bug wave. I’m guessing it over revved and but the dust. Am I losing my mind?

  5. #5
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Fx140 starter voltage drop - No Start

    OUCH! Sounds like it's time for teardown.
    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
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    Re: Fx140 starter voltage drop - No Start

    Quote Originally Posted by Myself View Post
    OUCH! Sounds like it's time for teardown.
    Any vendor you recommend for rebuild kit?

  7. #7
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    Re: Fx140 starter voltage drop - No Start

    Quote Originally Posted by tulsarust View Post
    . ... I’m guessing it over revved and but the dust. Am I losing my mind?
    Don't these things have rev limiters on them?

    You are not losing your mind. It was already gone with you got one of these crazy things!!!!

    But you are in good company.
    Last edited by hemmjo; 11-25-2021 at 06:39 AM.
    2, 1998 TS 770 L, restored and running great as of July 2019 (NO THANKS to the person at SBT, who put the WRONG crankshaft bearing into the rebuilt engine I got from them)

  8. #8
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Fx140 starter voltage drop - No Start

    Quote Originally Posted by tulsarust View Post
    Any vendor you recommend for rebuild kit?
    I did my wife's with bearings from SBT, gaskets and seals from WSM, and had to buy a piston, valve, spring, and a few other small parts which were oem Yamaha.
    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

  9. #9
    PWCToday Newbie
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    Re: Fx140 starter voltage drop - No Start

    Quote Originally Posted by hemmjo View Post
    Don't these things have rev limiters on them?

    You are not losing your mind. It was already gone with you got one of these crazy things!!!!

    But you are in good company.
    You are spot on with that diagnosis!!

  10. #10
    PWCToday Newbie
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    Re: Fx140 starter voltage drop - No Start

    Quote Originally Posted by Myself View Post
    I did my wife's with bearings from SBT, gaskets and seals from WSM, and had to buy a piston, valve, spring, and a few other small parts which were oem Yamaha.
    Cool. Thanks!

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