Yamaha 2004 WR 450

2 replies to this topic
  • wr450senior

Posted July 14, 2007 - 01:00 PM


Hey is there anything special about doing a compression check on my 04 WR 450? All I know is to warm the engine up install the compression tester and hold the throttle wide open while spinning the engine for 3 or 4 seconds. Am I missing anything here? Thanks for your help.

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  • mcflzwr450f

Posted July 14, 2007 - 02:14 PM


I think you want the reading from the 3rd compression stroke, someone correct me if I'm wrong.

  • txaggie929

Posted July 14, 2007 - 02:28 PM


That's about right, the third or fourth. You don't have to hold the throttle wide open, but you can. Check it both ways for grins.


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