It's your switchbox, I just did this on my 75hp 4cylinder.
The weight of a 1967 horsepower 4-cylinder Mercury engine can vary depending on the specific model and configuration. Generally, 4-cylinder outboard motors from that era typically weigh between 200-300 pounds. It's recommended to check the manufacturer's specifications for the exact weight of the model in question.
A Mercury outboard motor weighs just over 200 pounds depending on the model number.
The dry weight of an 1985 model, 75 hp Mercury outboard is 265 lbs
The 75 hp Mercury outboard will need a starting battery in the 650 CCA range, although, up to 1000 CCA would work just fine.
The 1991 Mercury 150 horsepower outboard motor weighs just over 400 pounds. The average weight of the motor, depending on the version, is between 390 and 404 pounds dry.
It should be some were between 120 to 125 on all 6. That would be on a motor in good condition. 115 to 120 is not bad. Just make sure they are witnin 20percent of one another.
http://www.oldmercs.com/models2.htmThis site has almost every part for old mercurys. They are not obsolete! I just my 1977 9.8hp outboard all the time!
The 5 hp Mercury outboard requires no special type gear oil. General recommendation is for a GL-5 class lubricant, i.e. hypoid 90w. Most any of the oem, or aftermarket gear lubes, manufactured for outboard use, will work just fine.
I just paid $850 for one and thats a good deal!
i just bought one and it has three carburators
The value is about 900-1100 if it runs really good I just sold mine for 975