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I Love microskiff.com!
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Discussion Starter · #1 ·
cold compression test done on a 2013 yamaha 4 stroke 70hp
numbers are between 95- 105psi. does this seem right? around 150 hours. seems real low for such a new motor.
 

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Brandon, FL
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10,798 Posts
I think compression should be checked on a warm engine. No idea what the compression should be.
 

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> PRO STAFF <
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7,520 Posts
Make sure intake flap is wide open when testing compression.
With the butterfly closed it restricts airflow, giving lower readings.
 

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Cert. Yamaha technician
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4,330 Posts
Its fine
Go find two other guages and see what they say.
Guarante you they wil all be different. Possibly higher or lower
 

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Registered
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1,544 Posts
Yamaha no longer recommends compression test on 4-stroke engines, A leak down test should be performed.
 

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Cert. Yamaha technician
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4,330 Posts
Agreed. Its a little more work but if you know what your doing it can tell you ANYTHING you need to know
 

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I Love microskiff.com!
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Discussion Starter · #9 ·
its for a boat that im looking at picking up. boats not in my area and the owner took it to a dealer to for a check up. every thing else seems good. i may run my own when i see the boat in person.
 
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