Head gasket leaking oil?
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  1. #1
    Junior Member Udoug's Avatar
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    Just bought an 04. Slight seepage of oil at head gasket I think. Its the area between the lower and upper heat sinks. And after riding I heard a sizzling and the smell of oil burning. Area is mildly stained/gummed with oil.



    What should I do? Replace head gasket? Do these heads warp? If it is the head what should I replace/do? Machine it? Replace studs?



    By the way I hear lifter noise. I'm sure some is normal but when I first started it, one was hanging up. It went away and previous owner stated it had been sitting 3 mos. Now I hear it continually (tat tat tat.. Tat... Tat tat...)when letting off the throttle it is more pronounced.



    Previous owner used yamalube which I know from previous experience wreaks havoc gumming things up in waverunners.



    Is the head steel or alloy? Thanks for any tips!

  2. #2
    Banned qwerty's Avatar
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    What the heck is a "heat sink?"



    Try a torque wrench on the top end bolts before doing anything else. Several people have reported needing to retorque top end bolts to stop oil leaking. Page 4-62 in the main service manual you can download for free has the correct torques and tightening sequence for the cylinder and head. It's more complex than just the 4 big hex-head bolts on top of the head.




  3. #3
    Senior Member Bagger's Avatar
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    Quote Originally Posted by qwerty View Post
    What the heck is a "heat sink?"




    Sleeping in an old feather bed in August.



    Glad I could clear that up for ya.





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  5. #4
    Junior Member Udoug's Avatar
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    a heat sink is any piece of metal with radiator like fins meant to disperse heat.

  6. #5
    Senior Member uktw125's Avatar
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    The head is all aluminium.



    If it's leaking on the cam chain side there are two allen bolts to retorque as well as the four main head bolts.



    I would not start replacing head gaskets or skimming heads until you have retorqued all the bolts.

    Engine cold, undo 1/2 a turn and then retorque to spec, 16 pounds for the head bolts 14 pounds for the allens on the side.

  7. #6
    Banned qwerty's Avatar
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    Quote Originally Posted by BanFracking View Post
    a heat sink is any piece of metal with radiator like fins meant to disperse heat.
    Well, there are no heat sinks listed in the parts book. Learn to speak Yamaha like everyone else, dude, or I'll start posting answers to your questions in Spanish.




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