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Old 11 August 2007, 07:19   #1
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Country: UK - England
Town: London
Boat name: Yellow Peril
Make: Ribcraft
Length: 5m +
Engine: Yamaha 100 (2T)
Join Date: May 2006
Posts: 82
How many PSI for an 8hp Yam twin?

Hi

I am just about to view a number of ex-sailing club 8hp Yam twins. They are 250-500 pounds depending on condition. It will be for my new SIB.

Pre-purchase checks will include a look-over, test run, and also compression test. What sort of PSI readings would indicate an engine with healthy internals?

Thanks!

Tim
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Old 11 August 2007, 08:21   #2
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Country: UK - England
Town: Bristol
Make: fletcher arrowbeu
Length: 5m +
Engine: johnson 175
MMSI: 235057234
Join Date: Mar 2005
Posts: 385
Try this site http://www.outboardrepairs.com/compression/
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Old 12 August 2007, 08:04   #3
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Country: UK - England
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Boat name: Yellow Peril
Make: Ribcraft
Length: 5m +
Engine: Yamaha 100 (2T)
Join Date: May 2006
Posts: 82
Quote:
Originally Posted by Tims Osprey View Post
Thanks. Seems over 100 PSI is good and the cylinders should be +/-15PSI maximum.
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