Tach is grey wire and fuel enrichment (choke) is yellow/black stripe. Sounds like you got those wires reversed. Tach runs directly off voltage rectifier/regulator module. Other possibility is that...

A plugged fuel cap on the fuel tank can cause what you say. The tank develops a vacuum since air can't replace the fuel the is pumped out and the pump can't overcome the vacuum.

Next on that...

Since you have tried numerous props hub slipping is out. Looking at other possible problems since you didn't mention changing anything else, one has to assume that you changed nothing else that...

I agree but for it to happen as you said, you must have hit something. Plastic replaceable hubs can shear and not recover. Pressed in rubber inserts are built to, and usually slip when an...

What is the history of the engine that would cause the shift linkage to be defective. I had that engine for 10 years and never had a shifting problem.

I don't know. You might look on the rear of the block. Location would be the water jacket covers through which the spark plugs emerge. Somewhere, probably near the top you may find a 1/8" NPT...

I don't know but probably not. The preferred method of monitoring engine cooling is with the water pressure gauge. Other option is via a temperature sending unit embedded in the block's cooling...

See above....dual post

I don't know. Seems to me a wiring harness would have the switches in parallel...side by side with power on one side and the motor on the other allowing power to be transmitted to the motor by any...

Mercury uses an unloaded 40kv ignition system to burn through possible contaminants on the insulators and corrosion on the electrodes. To get the benefit you need a wide gap. 0.040 is the gap my...

I have a 2002 model and the manual clearly states that compression tests below 120 PSI, expect problems. I'd say you are quite a bit low. The helical coil fix may have upset the heat sinking of the...

LMAO. Great reply.

Absolutely mind boggling. I guess Christopher Columbus was lucky that the world was a sphere!

The 2+2 runs on the top two always. The bottom two get bathed in fuel oil mixture until around 1800-2000 RPM where the fuel oil mixture volume is sufficient to cause combustion and they come to...

That's what I did. Just pay attention to oil consumption...part of the get ready to go procedure.

Faztbullet see this and can probably solve your mystery.

Sounds like they didn't get the linkage setup properly before reinserting the LU. To each his own, but I like to use N. Prior to reinstalling the LU, I go to the control box, put it in N and rock...

Commander 2000 and 3000 have been around for years and are built to fit many Mercury engines with standard hookups. I had an 88 115 but don't recall the control box specifically, other than I liked...

My readings, posted by others are that you can't rejuvenate old gas. My experiences with gasoline is that you have to eliminate bad gas as a potential cause of a fuel related problem BEFORE you get...

On the 2+2 running double oil might cause a sparkplug fouling problem with 3 and 4 if you spend much time at slow speeds. Using Pennzoil Super Premium Semi-synthetic could help control that problem.