Name:	anchor down -	Reply
Subject:	Down on power
Date:	7/8/2016 12:25:51 PM

Got a older 2 stroke Mercury 60hp down on power. Already replaced the plugs and initially that fixed the problem for 3/4 of the day and then back down on power. Almost feels like its down a cylinder. I checked for fire on the plug wires and seems to be firing from the shock I got!!! Also starting to small fuel. Figure that's from being down on power. Idles just fine. Any suggestion much appreciated. Putting a damper on our beach trip. 

Name:	Shortbus -	Reply
Subject:	Down on power
Date:	7/8/2016 2:39:44 PM

Someone just gave me a 1997 Mercury 75HP.  Looks like the top cylinder has 90# compression.

90# cylinder runs intermittantly.

Cylinder wear likely from no lube.  No lube likely from no fuel/oil delivery.  No fuel/oil delivery likely from clogged carb.

Clogged carb likely from ethanol.

Buy a compression gauge and test all cylinders.  Below 100-110# needs rebuild.

Name:	CAT BOAT -	Reply
Subject:	Down on power
Date:	7/9/2016 6:24:16 PM

Replace the fuel pump diaphrams on the manual fuel pump.  They are probably leaking back into the crank case.

Name:	anchor down -	Reply
Subject:	Down on power
Date:	7/16/2016 6:51:25 PM

Completed the replacement on the fuel pump diaphragms. Enjoyed learning how to do this job but unfortunately it did not solve my problem. Still down on power. 

Name:	GoneFishin -	Reply
Subject:	Down on power
Date:	7/16/2016 10:54:11 PM

Time to call Steve and make an appointment. Sounds like you need to get if fixed by Cathouse Marine at 334-517-6500.

Name:	CAT BOAT -	Reply
Subject:	Down on power
Date:	7/17/2016 9:38:19 AM

Wonder if the fuel pickup in the tank is restricted????? 

Name:	anchor down -	Reply
Subject:	Down on power
Date:	7/17/2016 10:13:48 AM

Doesn't seem to be a fuel restriction due to the smell of fuel. I purchased another round of spark plugs to run again. As another observation. The 3rd or bottom plug appears to have some fluid on it. Will update after another run at it today. Agree, it's about time to hand it over to a pro. 

Name:	Shortbus -	Reply
Subject:	Down on power
Date:	7/18/2016 9:39:14 AM (updated 7/18/2016 9:40:51 AM)

If getting shocked from a plug wire changed how the motor ran and you got shocked touching it, plug wires may be shorting to ground.

You could start it at night and use a clean wood or plastic stick to move the wires (especially away from metal) and see what happens.

Solution may be to replace plug wires.

Name:	anchor down -	Reply
Subject:	Down on power
Date:	7/26/2016 9:06:23 PM

Compression test revealed bad #1 cyclinder. So time for a rebuild. The boat and motor are over 20 years old so all the value is in my love for it. Due to the cost I will attempt to rebuild myself. I will appreciate and accept any technical support. I know I will have many questions along the way. 

Name:	Shortbus -	Reply
Subject:	Down on power
Date:	9/21/2016 2:48:57 PM

If the rings are dirty and stuck to the piston, try Yamaha Ring-free.  Amazon has it.

I would try that before tear down.

Name:	Shortbus -	Reply
Subject:	Down on power
Date:	4/5/2017 1:29:12 AM

Well, is it running?

Name:	anchor down -	Reply
Subject:	Down on power
Date:	4/5/2017 7:59:13 AM

Yes, it is running. I rebuilt it myself. Took me about 2 months. Learned a lot. Thanks for following up. 

Name:	Shortbus -	Reply
Subject:	Down on power
Date:	4/5/2017 10:01:27 AM (updated 4/5/2017 10:11:02 AM)

And the failure mode / failed part(s) were?

Name:	anchor down -	Reply
Subject:	Down on power
Date:	4/5/2017 12:31:43 PM

Blown cylinder. Needle bearings out. Thermostat corroded.  

Name:	Shortbus -	Reply
Subject:	Down on power
Date:	4/5/2017 2:09:40 PM

Use the old crank?

Name:	anchor down -	Reply
Subject:	Down on power
Date:	4/5/2017 2:30:39 PM

Yes, but replaced all the bearings. 

Name:	Shortbus -	Reply
Subject:	Down on power
Date:	4/5/2017 4:48:14 PM

Congratulations.  Saved money, learned a skill, instilled a bit of self pride. Win win win.