Mercury 85HP Thunderbolt Ignition Series??? Whats missing??

[racerone]

That 115 appears to be a 1979.----Fuel pump is different.

 

[Chris1956]

Merc850 is likely correct. I do not know if any 1150/1500 had the dual triangle fuel pumps. Some might have. A lot had the single figure 8 fuel pumps. With some transfer covers from the motors with that figure 8 fuel pump, and some creativity, you could probably retrofit it. The ign wiring would likely fit, but OEM harnesses have a history of being shot at this age.

If the parts motor is a later model with ADI ignition, I am not sure you can use it for parts. If it is earlier than 19791/2, and the trigger is good, it might be worthwhile, just for that.

I am worried that your motor with it's good compression, was not fixed by the PO. Why was that?

 

[merc850]

Found this wiring dia. appears that those motors used ADI not a distributor.

 

[Chris1956]

The IL6 motors converted to ADI ignition in mid 1979. The IL4 motors converted to ADI ignition in 1975, if memory serves.

 

[Nordin]

"Blue ribbons" Mercury started in 1972 and your engine is a 80Hp with 85Hp decals. In 1973 they were rated as 85Hp up until 1977, then i 1978 80Hp again.
1972-1975 had battery feed thunderbolt ignition system with a distributor, in 1976 and up they were equipped with ADI ignition.
Master Tech marine can be a good source for parts and check out Mercson at Youtube he works with 4-inline and 6-inline Mercurys.