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Thread: Source of Oil Leak?

  1. #1
    Senior Member RobG's Avatar
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    Source of Oil Leak?

    I've confirmed that I have an oil leak. But I'm not sure where it's coming from. Any suggestions? I clean the motor and it reappears after each ride.

    2015-06-05 19.59.56.jpg
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    Senior Member TW-Brian's Avatar
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    Try and clean off as much of the oil as you can. Then dust some baby powder, talcum powder, flour or whatever you have onto the suspected areas. Then start and run the engine. Any leaking oil should show up and allow you to narrow down the location of the leak.
    Smitty Blackstone likes this.

  3. #3
    Senior Member elime's Avatar
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    My guess is the big cover on the side of the head that covers the sprocket for the camshaft is the source of the leak. There is a big o-ring under it and it has to be replaced, like all o-ring, after a while.

    If you could take another picture a little higher up on the head......
    Long live the internal combustion engine!

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  5. #4
    Senior Member frog13's Avatar
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    Kinda hard to tell from photo . Exhaust valve cover o-ring maybe?. If it's around the left side (shift lever side) case cover I agree with the above suggestions.

  6. #5
    Senior Member RockyTFS's Avatar
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    I had small leaks from both the exhaust and intake covers...this is common. I replaced both those O-rings at about 8,000 miles. It was only after getting the new ones and looking at them side by side that it was obvious that the old ones were flattened and not sealing real well. My cam cover O-ring has yet to need replacing but at 10,000 miles it can't be too far off. Baby powder will tell you exactly where within about one minute at moderate RPM.
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  7. #6
    Senior Member GaryL's Avatar
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    With out seeing it up close and personal I would guess it is blow by from the exhaust pipe gasket. Looks like you used an XT header pipe and it could possibly not be fully seated in the head.

    GaryL
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    Member RobertAmsterdam's Avatar
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    An xt header pipe? Which does fit?...hmm search option

  9. #8
    Senior Member RobG's Avatar
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    Thanks everybody. I think it's probably coming from that cam timing cover. I've already replaced the seals on the valve adjustment covers. I'll order up one for the other cover and that'll likely take care of it. If not, then I'll plan on pulling the head in the not too distant future and change that gasket out... which will probably mean puling the jug and changing the base gasket... which will mean why not put in a fresh piston and rings while I'm at it. The whole thing would take an afternoon, so no biggie.
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    Senior Member elime's Avatar
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    A high compression Wiseco piston -- the kit comes with rings, wrist pin, and circlips. Start shopping ebay now for "Wiseco 4292" or "Wiseco 4292M06700" for stock bore or "4292M06750" for a .5mm oversize and you'll have to have your cylinder bored or honed out. Raise compression ratio from 9.5 to 10.25.

    Try to find a kit for around $65. Less is better. Make sure it has new wrist pin, circlips, and rings.
    Long live the internal combustion engine!

  11. #10
    Senior Member RobG's Avatar
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    The big O-ring for the cam sprocket cover did the trick! No more leak.

    Truth is I'm a little bummed. I had figured if that wasn't it, then it was very likely the head gasket. That meant I had enough reason to go into it and do the new piston/rings and cam. Oh well, maybe later.

    BTW -- if I did that high-compression piston, I would I have to switch to Premium Unleaded gas?
    littletommy likes this.
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