Moderate Oil Leak
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Thread: Moderate Oil Leak

  1. #1
    Junior Member Nero's Avatar
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    I bought this bike a little over a month ago and have been riding it regularly since. I noticed that it had a small oil leak when I got it but the guy I bought it from said that it was less severe than it actually looks. I don't know anything about motorcycles as I chose this one as my first motorcycle. I come here for help because I think maybe someone here can identify this. Maybe someone has had the same issue before. It's a 2005 model and as far as I can tell is totally stock. My brother went to school for engines and he told me from looking at it, that he thinks the leak is coming from where the front sprocket goes into the engine? If that is so then why is the head and everything below it soaked with oil. The plug, chain, and chain-guard is soaked with oil, as well as the plate that is on the bottom of the engine is holding oil and drips. It is slinging oil back onto the tire a little and I am afraid it's going to cause me an accident. Please take a look at these pictures and tell me if you think that it is going to be worth getting it fixed. I have an appointment scheduled to get it looked at by World of Yamaha but it's not until the 20th. If it's not going to be worth it to fix it (money) then I'm not going to get it fixed. I only paid $700 for it and the guy I bought it from doesn't know anything about bikes either, so I think I got a good deal. It runs good and I haven't had any problems out of it except for this and the gear will sometimes slip from 5th down if I'm really giving it hell.












  2. #2
    Senior Member lizrdbrth's Avatar
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    I'd say it originated at the valve cover gaskets from the wind pattern. No way to tell with the motor that dirty. Clean it up with a pressure washer, get it spotlees then run it in place checking for the actual source.



    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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  3. #3
    Senior Member pgilles's Avatar
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    Quote Originally Posted by lizrdbrth View Post
    I'd say it originated at the valve cover gaskets from the wind pattern. No way to tell with the motor that dirty. Clean it up with a pressure washer, get it spotlees then run it in place checking for the actual source.


    I agree, and some of the oil is also probably from fumbling hands trying to tighten the "oil pressure check" screw after an oil change
    Sold bike.



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  5. #4
    Senior Member christddel's Avatar
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    For the oil leak on the rear wheel








  6. #5
    Junior Member Nero's Avatar
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    I pressure washed it and left it running. Found out exactly where it's leaking but I have no idea what it is.








  7. #6
    Senior Member pgilles's Avatar
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    That's your crankcase breather hose and it vents into the airbox. Possibly a dirty air filter would draw more vacuum out of that hose and suck in more oil. Possibly you have excessive blow-by causing it to vent more than usual. Take off the tube, clean it up, clean up the intake box and see how long it takes to come back.



    On my second look, is the end of the hose even hooked up to anything or just a screen over it???
    Sold bike.



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  8. #7
    Junior Member Nero's Avatar
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    Actually I think I found out where it is. See the hole in the red box I outlined? Are there supposed to be screws in that one and the one to the right of it (not in the picture). If so then I think I may have found how to fix it? It seems that under that thing that I have labeled UNDER HERE it's not all the way together, and may be leaking there, since the chain and chain-guard is soaked in oil.




  9. #8
    Senior Member lizrdbrth's Avatar
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    Dood, your bike gots issues .



    Mostly curable, but you'll need to identify some things..



    If you have oil in your airbox it shouldn't be there. That little piece of tubing with the flattened end is the drain. Put something under it, pull the tube and drain it. If it smells like gas you have a stuck float. If it doesn't, some dink over-oiled the air filter, layed the bike down for a prolonged period, or it has so much blowby that it's filling the airbox. If it's anything other than an overoiled filter you need to stop dead in your tracks and get some advice.



    will_m likes this.
    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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  10. #9
    Junior Member Nero's Avatar
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    Quote Originally Posted by lizrdbrth View Post
    Dood, your bike gots issues .



    Mostly curable, but you'll need to identify some things..



    If you have oil in your airbox it shouldn't be there. That little piece of tubing with the flattened end is the drain. Put something under it, pull the tube and drain it. If it smells like gas you have a stuck float. If it doesn't, some dink over-oiled the air filter, layed the bike down for a prolonged period, or it has so much blowby that it's filling the airbox. If it's anything other than an overoiled filter you need to stop dead in your tracks and get some advice.


    I loosened the airbox cover and oil poured out of it so I put it back on.



    edit: Ok I took it completely off and this is what happened. I don't have a 10mm so I can't take the seat off to find out how to take the airbox off and find out why it's leaking so bad.







    It appears a moderate oil leak turned into a major oil leak.

  11. #10
    Senior Member lizrdbrth's Avatar
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    You don't need to remove the seat. Oil shouldn't be there and none of the potential causes are under the seat.



    Drain the airbox, scrub that motor clean and get some proper tools and we can talk you through each of the issues if you're willing to try. Otherwise wait for that appointment at the dealer and don't start the bike.



    Can you see the oil level in the window or is the entire thing dark?



    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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