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Jan 23rd, 2013
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Yamaha 150 Vmax compression?? #12668002
03/11/18 05:53 PM
03/11/18 05:53 PM
Joined: Aug 2016
Posts: 197
SETX
J
JKib Online content OP
Outdoorsman
JKib  Online Content OP
Outdoorsman
J

Joined: Aug 2016
Posts: 197
SETX
I'm looking at a boat 6 hours from me with a 2000 Yamaha vmax and the guy said he did a compression check. It was 150psi on the top cylinders and dropped 10lbs from there, can anyone tell me if this is normal, or what is normal?

Re: Yamaha 150 Vmax compression?? [Re: JKib] #12668167
03/11/18 08:11 PM
03/11/18 08:11 PM
Joined: Dec 2008
Posts: 7,264
Boerne, Texas
G
grout-scout Online content
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grout-scout  Online Content
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Posts: 7,264
Boerne, Texas
So one cylinder had 150 and the rest were 140? Sould be within 10lbs or so total from the highest to the lowest.


My cylinders were at 135 on my 2000 vmax, I guess the gauges could all read differently though.


Re: Yamaha 150 Vmax compression?? [Re: JKib] #12668170
03/11/18 08:14 PM
03/11/18 08:14 PM
Joined: May 2003
Posts: 11,490
Littlefield Tx & Lake A. H. US...
gary purdy Offline
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gary purdy  Offline
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Joined: May 2003
Posts: 11,490
Littlefield Tx & Lake A. H. US...
I say something is wrong with his compression gauge. 110-115 is the target I believe but I have been wrong many times before.


The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
Re: Yamaha 150 Vmax compression?? [Re: JKib] #12695413
03/29/18 06:20 PM
03/29/18 06:20 PM
Joined: Apr 2013
Posts: 195
Lavon, Tx
I
IKELEVI Offline
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IKELEVI  Offline
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Joined: Apr 2013
Posts: 195
Lavon, Tx
I had a Yamaha vmax 150. Cylinder pressure was in the 120 range. Seems kinda high.

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