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150 hp 2 stroke Yamaha, 90 psi
Alley Oop	#1  Posted on 04/14/19 - 10:35 AM
Member Posts: 67 Comments: 0 Joined: 07/06/14	I'm looking at a 18 ft 1992 Outrage with 150 hp Yamaha 2 stroke that is showing approx 90 psi on all cylinders. 90 psi seems to be low for that motor. Do you think the motor is repairable or should I be considering buying a new outboard? The pics show a decent looking hull. Comments please. Thanks in advance. Alley Oop The beatings will continue until morale improves.
acassidy	#2  Posted on 04/14/19 - 3:17 PM
Member Personal Page Posts: 268 Comments: 1 Joined: 11/21/05	As long as they are within 10% of each other I would not worry. Or get a mechanic to check the motor out.
Alley Oop	#3  Posted on 04/14/19 - 5:54 PM
Member Posts: 67 Comments: 0 Joined: 07/06/14	Another of my concerns is that I don't know what the compression should be. I'll be calling Yamaha tomorrow for that info. The beatings will continue until morale improves.
JRP	#4  Posted on 04/14/19 - 6:09 PM
Member Posts: 755 Comments: 2 Joined: 08/29/14	Is this a 19 Outrage II? If so, that is same year make model as mine, including the engine. I don’t have the compression spec in front of me, but have a vague memory it should be around 120. I could be wrong on that, though. One weak spot with these engines is that the shift-shaft was (incredibly) made out of mild steel instead of stainless. You’ll want to budget to replace it if it hasn’t been yet. If you can provide a link we could take a look at the photos and give you suggestions for items to check carefully. 19 Outrage II (1992)
Alley Oop	#5  Posted on 04/14/19 - 8:20 PM
Member Posts: 67 Comments: 0 Joined: 07/06/14	Hi JRP, The compression tells me that the motor probably has to be replaced. Here's the link (removed email address instead if a link) thanks. Edited by Joe Kriz on 04/14/19 - 9:06 PM The beatings will continue until morale improves.
Joe Kriz	#6  Posted on 04/14/19 - 9:01 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	That is not a good link.
Alley Oop	#7  Posted on 04/15/19 - 12:03 PM
Member Posts: 67 Comments: 0 Joined: 07/06/14	Just checked with a Yamaha mechanic, the compression new was 135 psi. He says when it drops below 100 psi, the motor has pretty much had it. Sorry about the link, in my defense, let me say that I am a techno peasant. The beatings will continue until morale improves.