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  1. #1
    vcbb10's Avatar
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    My 2006 FX-HO's Engine Blew. Any ideas what may have caused this?

    My 2006 FX-HO Waverunner's engine blew out the first time out this year. Any ideas on what could have gone wrong with it?

    It ran fine all last summer, never had any issues. Bought it last year with 72 hours, only 95 hours when the engine blew. MR-1 engine, freshwater ski, garage kept.

    Winter mods:
    Had the dealer do the cooling hose clamp notice/recall work
    http://www.pwctoday.com/showthread.p...Lzym-BjwNd5aEo
    Put in new 'upgraded' NGK Iridium CR9EIX plugs
    Oil Chnage
    Winterization/summerization
    Solas Intake Grate SY303
    R&D pump seal kit 162-00002
    Sealed up intake bolts, etc. with Ultra Black
    Other unrelated upgrades (chartplotter install, etc.)

    I ran the ski for about 10 minutes <4,000 RPM, checked oil level. The oil level was fine, between E/F, slightly above half. Ran it at slightly higher RPM's for a minute or so before doing a WOT run. It ran strong, hit slightly higher top speed than last year, 58 mph due to intake/pump seal. I did a few more runs minutes after that and the top speed was lower, mid 50's and than in the 40's. Double checked oil level between one of those runs, it was still fine. Than it died. I got a tow back to the beach, didn't tow over 5 mph. Pulled the plugs and the Iridiums were burnt up. The electrode on 3 of 4 was completely burnt and gone (see pics).

    So, I figured the Iridium's might be the issue so I put a new set of gapped CR9EB (stock) plugs in. Blew out the cylinders with compressed air prior to fitting the plugs. It had a tough time starting for a bit, but did start. Ran it at idle for a while and low speed, no real issues. Slowly tried it at higher RPMs and still no problems. Did a few WOT runs and once again was hitting good speeds (58mph) and RPMs (10,100). Let it sit a while. Went out and did two more WOT runs, no problems. Than I was testing out a depth finder to see at what speeds it would still read depth. I was slowly running at 15 mph and increasing speed 5mph at a time while watching the finder. When I got to 45mph, the engine blew.

    Got it towed back, left the drain plugs in (to keep all her brains/oil/debris in the hull) and haven't touched the plugs/hull since.

    The slow acceleration run when the engine blew (surprisingly can't hear it...):


    Video of the damage:


    The last WOT run 10 minutes before it blew (no issues):


    Burnt up Iridium Plugs:


    Damage 1:


    Damage 2:


    RIP :
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    Last edited by vcbb10; 06-06-2019 at 06:48 AM.


  2. #2

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    First, sorry to hear that man, it sucks.

    I'm not a jetski mechanic but I was an auto mechanic for 15+ years. I'll take a stab at it since no one else has.

    First are you sure those were the right plugs?
    Are you sure they burnt up?

    I think they broke off in cylinder either because they were too big and the piston was hitting them or maybe they were defective or damaged already.

    If pieces of one of those plugs were in the cylinder it absolutely could blow thru the cylinder. Just my thoughts.

  3. #3
    I'm not seeing where they recommend an Iridium plug for a 06' - just standard.

    I've checked a couple of websites now.

    I believe those iridiums let go in your engine and destroyed it.
    Last edited by LivingSlow; 05-21-2019 at 09:18 PM.

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  5. #4
    vcbb10's Avatar
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    Could have been the iridium's. I know others have ran them in the mr1 ho engine without issue. Not sure why they burnt up in mine. Should have done a better job of clearing debris from the cylinders prior to putting in new plugs and running it again.

  6. #5
    Did you happen to try and gap those iridiums? The electrodes are fragile and should be installed as is typically.

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  8. #6

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    Quote Originally Posted by LivingSlow View Post
    Did you happen to try and gap those iridiums? The electrodes are fragile and should be installed as is typically.
    I was thinking exact same thing

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  10. #7
    ptscon's Avatar
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    The motor could have been hydro-locked in the past and was nursing a slightly bent rod till it finally let go.


  11. #8
    WaterDR's Avatar
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    Did you run correct temperature plugs?

  12. #9
    Hawaii's Avatar
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    Quote Originally Posted by ptscon View Post
    The motor could have been hydro-locked in the past and was nursing a slightly bent rod till it finally let go.
    I Think this would have a good possibility too , also bro sorry that shit happened to you

  13. #10

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    It would also be interesting to know if the piston blew apart. That would support my theory of broken spark plug pieces in the cylinder. If this is the case. It could be a fairly easy fix. Meaning everything else is probably still good. Might get away with just a cylinder, rod, and piston. Would have head milled

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