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No attempt should be made to troubleshoot this engine at all until a propeller is installed and the proper load placed on the engine, In the water and on the back of a boat. "Troubleshooting 101"

Not sure you are on the right track with this yet but we dont have enough information at this point. Main reason is that these plastic tanks are well known for building pressure in them as has been stated already. They are typically designed to hold up to 5psi. With any pressure in the tank...

Lets say I use Rec fuel (no alcohol) and the price is 4.25/gallon. or - regular 89 octane at 3.75/gal Walmart has not stopped selling 2-stroke oil by the way. Walmart Super Tech oil (which is manufactured by either Warren oil Co, Exxon Mobil, or Pennzoil) at 18.75/gallon So.....at a 24:1 ratio...

lol an 18 doesn't burn much gas to worry about the oil. If you are worried about oil usage the vintage fleet is not for you. I suppose a 4 stroke could be purchased and then towed by an EV to ease your mind?

Brown is Viton and tells me that the carb has been gone through at least one time.

The carbon seal resides on the bottom of the crank, not the gearcase. The actual seal itself is installed inside the carbon seal. What color is the bowl gasket on the carb. Should be able to see it.

Totally your decision. Best tip you will get today is that on every single one of the old split line gearcases you need to change out the shift shaft seal. That is always the main source of a leak. With a couple psi pressure in the case you can wiggle the shift shaft and see bubbles if you have...

All signs of a rich running engine. Once dialed in there is very little smoke even from a 24:1 mix. That is one engine you do not want to run on a lean mix at all. 3-ring piston engines have a ton of parasitic drag and you do it no favors by lessening the oil film they ride on. As was said...

Evinrude nor Johnson built an 18hp in 1956. That started in 1957. In 1956 there was a 15hp. Go to AOMCI.org online and to the ask-a-member section in there about spare or replacement parts. There are tons out there. While off you did not mention crank seals. On that engine they are easy to...

Started and run a ton of Yamaha 4 strokes. They start flowing from the indicator as soon as the block fills not when the thermostat opens. One easy check though is to put a toothpick or wire up into the indicator nozzle and clear it. If the pump is good it should start pumping at this point...

What was the output? Looking at a 3500W but know zero about WEN and reputation

Thill.....am thinking you are referring to charging up your starting battery? Huge difference between that and a trolling motor battery.

There are both 3-gallon and 6 gallon single line tanks available for your engine. Both are metal and I would recommend you stay with a metal tank. Either purchase the OMC primer bulb and OMC fittings separately and add your own line or you can purchase the entire assy. Stay away from cheap fuel...

All the comments above are spot on. Have you priced the kit plus labor and have you determined the total output of the Merc charging system and at what RPM it puts out peak amperage? I think you may be a bit shocked. Once answered you will see why it is not an acceptable solution. A 2000w...

It is the responsibility of the OP to state what engine he is asking about. You are correct on the hp range though. Also we are lucky enough to have a few guys in here that are pretty darned good at troubleshooting....would like them to start requesting this information more often before things...

Once again and right off the bat, we do not have enough information. Always state exactly what engine you have when requesting information on it. What year is your engine? Been a lot of armchair quarterbacking without knowing exactly what engine we are diagnosing. In this case the information...

In 1986, when your boat was manufactured, all of the recommended engines were lighter 2-strokes as there were practically zero 4-strokes out there. I have run quite a few 12' boats with 15. 18, 25, and 35hp engines on them and they were all a handful at WOT throttle settings if running a single...

Look for a reliable dealer with a good reputation instead of a reliable online seller who never touches the engine. You will establish a relationship with that dealer who will then help you if you ever need it.

Have used Garzon before for the rather elusive Glaspar compass point decals. Good people for sure and fast service.

the 15hp carb is just like the 9.9hp carb. They are both attached to a throttle. Takes the same horsepower to move your boat at a given speed and you control the throttle. Cruise at the speed the 9.9 pushes you and fuel burn will be very close to identical. Need to outrun a storm, you have the...