Re: 1984 Mercury 150 Black Max ,smoke & little water threw pump
Knowing the engine history would help; possible issues:
1. Bad fuel
2. Varnish in fuel system caused by lack of operation
3. Water pump impeller damaged due to sitting up if that applies
4. Water pump impeller damaged due to usage and being worn out
5. Carbon laden combustion chambers due to lack of cleansing and years of usage.
6. Dirty sparkplugs
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You have to decide what you want to do.
A tank of fresh fuel using Merc's finest 2 cycle engine oil and about 1 16oz can of Sea Foam (at Autozone or others) per 5 gallons (2 for 10 gallons)_of fuel to start and a couple hours of blasting around the lake and your performance and smoking issues should be under control. Then, when you get home, put in a new set of sparkplugs and the next time you are at the lake it should be a piece of cake.
The engine should have thermostats and a thermal overload alarm. If you get into problems during your run-in then stop and go get a water pump repair kit and install it......or better yet, before you make your run, install the kit and be done with it.....best idea.
With those three things accomplished, you should have your problems solved. On the Sea Foam, once you have cleaned out the carbon and crap from your engine, 1 oz per gallon of fuel (fuel oil mix) is the recommended maintenance ratio and the engine likes it. Money well spent .
Balls in your court.
Mark