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  1. #1

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    Caught fire last night

    I'm not yet 100% sure what caused it. Was running great, then sputtered to a stop. Best I can tell, the oil overflow vent valve melted, which then spilled hot oil on ceratin plastic parts (like the engine harness wires), which caught fire. I had only been running for 10 minutes, and lucky still close to my dock. There doesn't seem to be any block damage... only other thing I could think of is leaking from the oil filter, but that looks secure. Any opinions for the experts?

    Looks like I can top off the oil, rewrap the burnt wires, and replace the vent valve, and be good to go again, but if I don't know why it happened, it could just happen again.
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  2. #2
    flyin' the friendly skies airbornexp's Avatar
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    i'd dig into it before I rewrap the wires and refill the oil...you probably have more wrong than you think. problems like these just dont show up and go away...my .02

    flash point of a synthetic oil is around 410-460*F. if it got that hot you have big time internal damage

  3. #3
    Moderator beerdart's Avatar
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    Is the J-pipe flex coupling intact?

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by VX1 View Post
    ...the oil overflow vent valve melted, which then spilled hot oil on certain plastic parts (like the engine harness wires), which caught fire...
    Oil doesn't conduct electricity, and shouldn't be hot enough to melt the wire insulation.

    Could the electrical fire happened first?

    Fuel leak?

  5. #5

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    The J-pipe does have an extender section on it with an extra V-clamp, which I've been concerned about leaking, but those clamps are on as tight as they'll possibly go. That 1" extended section is not water-jacketed and does get crazy hot, but I don't think the wires or anything else was close enough (I have to have the extender for my thru-hulls). I previously had fiberglass exhaust wrap around it, but the heat destroyed it. It was a fairly small fire, when I opened the engine compartment, it really just looked like the vent valve was the only thing on fire, and was easy to put out with a quick spray from the extinguisher. The only collateral damage was a slightly melted plastic intake pipe, and the cover to the nearby wires. I think the only thing that caused the engine to quit, was when the exposed ignition wires were touching each other.

  6. #6
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    I'm just trying to help and not be a smarty pants....

    But, I've never seen fibreglass wrap / ceramic wrap get hot enough for it to burn off.
    That stuff is meant to be a pretty good fire retardant and handle a fair bit of heat.

    Your problem maybe here...

    Or previously the same thing happened.

    Maybe fuel blow by from the oil vent reached flash point...

  7. #7
    Moderator beerdart's Avatar
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    Check the flex coupling on the J-pipe under the shroud.

  8. #8

  9. #9
    GOT BOOST? Dockside's Avatar
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    Im thinking you have a fuel leak or wiring problem.... IMO i wouldnt fix the burnt wires, id get a new harness. Chances are you have an electrical problem.

  10. #10
    Orlando Shark's Avatar
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    Yeah I would definitely look into that before I would ride again. Look into the j pipe thing and make sure your water holes at the end of it aren't getting plugged and causing not enough water to flow and overheat.

    Have you gotten any overheat codes prior to this or anything?

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