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Old 27 August 2009, 04:58   #1
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Compression Test

I am going to compression test my Yam 50 and want to know is it as simple as connecting the gauge to each cylinder and turning over the engine (obviously disabling the ignition)?

At what temperature should the engine be to carry out the test?

Many thanks.
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Old 27 August 2009, 05:01   #2
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I think your meant to run it for 5 min then test each cylinder over 4 revolutions?
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Old 27 August 2009, 05:07   #3
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with full throttle or readings are useless
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Old 29 August 2009, 11:37   #4
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Some manufacturers don't recommend to have more than 15 psi between cylinders to a proper/ok compression reading.

Happy Boating
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Old 29 August 2009, 13:28   #5
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Him above sounds right.
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Old 30 August 2009, 05:52   #6
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I'd like to have mine tested. Is it something any car garage can do?
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Old 30 August 2009, 07:41   #7
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Even you can do it my friend!
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Old 30 August 2009, 08:11   #8
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Quote:
Originally Posted by chewy View Post
Even you can do it my friend!
What do I need to do?
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Old 30 August 2009, 08:28   #9
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Buy one compression tester, bout £15 me thinks, stick it in where one of your spark plugs would go and turn the engine over with the kill switch on so it doesn't fire, should get a steady reading after a few revs.

http://www.outboardrepairs.com/topics/005915.html
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Old 30 August 2009, 08:36   #10
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Thanks mate!
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