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27 August 2009, 08:58
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#1
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Member
Country: UK - England
Town: Plymouth
Make: Avon SR4,AX500
Length: 4m +
Engine: Yam 50 2 Stroke
Join Date: Jan 2009
Posts: 418
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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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27 August 2009, 09:01
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#2
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Member
Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
Engine: Yam 55, Volvo 200
Join Date: Apr 2007
Posts: 5,217
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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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27 August 2009, 09:07
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#3
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Member
Country: UK - England
Town: Bromsgrove
Boat name: Kick-Ass !
Make: PAC/Artic 22
Length: 6m +
Engine: 250hp Yamaha
Join Date: Nov 2003
Posts: 3,572
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with full throttle or readings are useless 
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MY BIGGEST WORRY IS THAT MY WIFE(WHEN I"M DEAD)WILL SELL MY TOY'S FOR WHAT I SAID I PAID FOR THEM.
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29 August 2009, 15:37
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#4
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Member
Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider 450 Rib
Length: 4m +
Engine: Tohatsu 5/18/30 HP
Join Date: Sep 2007
Posts: 1,998
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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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29 August 2009, 17:28
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#5
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Member
Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
Engine: Yam 55, Volvo 200
Join Date: Apr 2007
Posts: 5,217
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Him above sounds right.
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30 August 2009, 09:52
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#6
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Member
Country: UK - England
Town: Southport
Boat name: Qudos
Make: 5.4 Searider
Length: 5m +
Engine: Yam 115 V4
MMSI: 235068784
Join Date: Sep 2008
Posts: 3,930
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I'd like to have mine tested. Is it something any car garage can do?
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30 August 2009, 11:41
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#7
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Member
Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
Engine: Yam 55, Volvo 200
Join Date: Apr 2007
Posts: 5,217
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Even you can do it my friend!
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30 August 2009, 12:11
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#8
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Member
Country: UK - England
Town: Southport
Boat name: Qudos
Make: 5.4 Searider
Length: 5m +
Engine: Yam 115 V4
MMSI: 235068784
Join Date: Sep 2008
Posts: 3,930
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Quote:
Originally Posted by chewy
Even you can do it my friend!
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What do I need to do?
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30 August 2009, 12:28
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#9
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Member
Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
Engine: Yam 55, Volvo 200
Join Date: Apr 2007
Posts: 5,217
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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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30 August 2009, 12:36
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#10
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Member
Country: UK - England
Town: Southport
Boat name: Qudos
Make: 5.4 Searider
Length: 5m +
Engine: Yam 115 V4
MMSI: 235068784
Join Date: Sep 2008
Posts: 3,930
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