2003 wr450f oil change

4 replies to this topic
  • jimmyz250x

Posted August 28, 2009 - 02:01 PM


i just bought an 03 wr450f. Is this a split case set up, or not? meaning the engin and transmission are using the same oil, or like a 250X, the engin oil and transmisson oil are seperate. If they are a seperate, where is the transmission oil check bolt? thanks for any help.

  • grayracer513

Posted August 28, 2009 - 03:29 PM


None of the above.

The engine and trans share the same oil, but the wrinkle is that it's a dry sump system. Oil is carried in the frame, pumped to the engine internals, sucked up and pumped back to the tank (frame) by a second oil pump. The trans and clutch are pressure fed.

Short form of the oil change:

  • Run the engine for 1 minute prior to changing oil
  • Drain the frame at the drain bolt at the bottom of the main down tube, above the oil line connections
  • Drain the crankcase at the drain plug under the rear center of the trans area
  • Remove and replace (or service if it's cleanable) the oil filter
  • Refill with 1.6L (400/426)or 1.1L (steel framed 450) of new oil and restart

More reading of interest:

Then, get a manual:

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  • jimmyz250x

Posted August 28, 2009 - 04:07 PM


Thanks ALOT grayracer513. I get a book for every bike I have, just has not come in yet. You helped me out in a big way. Dont need to wait for the book before I can :ride: the bike

  • Lcpl0331

Posted August 28, 2009 - 06:09 PM


1.6L?? draining as much out as I can get to come out I can only refill 1.2 or so and after checking the amount on the dipstick I'm about at the top. Isn't 1.6 way too much or am I doing something wrong? I follow the procedure from that video that is floating around here somewhere exactly.

  • grayracer513

Posted August 28, 2009 - 06:47 PM


Oops, that's for a 426. 1.1L for the steel 450's. :ride: :)


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