yz450f oil leak

4 replies to this topic
  • JakeHod

Posted September 07, 2016 - 05:29 AM


hi, new here.

recently bought an 03/04 yz450f, all looked okay but when the engine is running oil is leaking from what looks like the square end of the oil pipe coming down from the frame on the left. would i be right to go ahead and replace the dowel pin and o-ring first? or has anyone else had the same problem know what i should do?


  • grayracer513

Posted September 07, 2016 - 07:23 AM


That's the return line.  The two possible places for it to leak from are the O-ring seal and the joint of the tube to the fitting (could be cracked).


When you replace the O-ring, be sure that the fitting lays against the engine squarely on its own, not twisted into place and bolted down in a strain.

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  • JakeHod

Posted September 07, 2016 - 04:02 PM


When you say the joint of the tube do you mean the dowl pin of the square end of the pipe?

  • grayracer513

Posted September 08, 2016 - 06:23 AM


No, I mean where the round tube is soldered into the square fitting on its end.

  • JakeHod

Posted September 08, 2016 - 06:33 AM


I see, thanks alot for the help

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