Yamaha 2004 WR 450

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.

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

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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