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#12668002 - 03/11/18 06:53 PM Yamaha 150 Vmax compression??
JKib Offline

Registered: 08/04/16
Posts: 170
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?

#12668167 - 03/11/18 09:11 PM Re: Yamaha 150 Vmax compression?? [Re: JKib]
grout-scout Online   content
TFF Celebrity

Registered: 12/08/08
Posts: 6980
Loc: 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.

#12668170 - 03/11/18 09:14 PM Re: Yamaha 150 Vmax compression?? [Re: JKib]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 11452
Loc: 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

#12695413 - 03/29/18 07:20 PM Re: Yamaha 150 Vmax compression?? [Re: JKib]

Registered: 04/23/13
Posts: 195
Loc: Lavon, Tx
I had a Yamaha vmax 150. Cylinder pressure was in the 120 range. Seems kinda high.


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