1981 Mercury 7.5 2 stroke

[keithb7]

I recently purchased a used 1981 7.5 hp outboard. I plan to use it with a small SIB. I am new to outboards but not new to mechanical repairs. I’ve rebuilt multiple other types of 2 and 4 stroke engines. I tend to source an OEM service manual ASAP. I’ve not found one yet but I will.

Is anyone able to tell me what year did Mercury start using the breakerless spark box on the 7.5? I might pick up a spare parts engine or two. Prefer years that are very similar to my ‘81.

I also curious to learn how many cc’s the engine is. If you have a manual you’ll sell let me know. Thanks. Keith

 

[Scott Danforth]

you can get the manual from Mercury or find them on-line at sites like oldmercs or AOMCI for the 7.5/9.8. look at the 1980-1985 motors as they are all the same.

the first thing you need to do is pull the leg, measure the vertical drive shaft diameter, then order a raw water pump kit. the reason you have to measure the driveshaft on that motor, is it could come with one of two sized shafts.

 

[keithb7]

Thanks. I will try those web sites.
I have already pulled the lower leg measured, the shaft and ordered a water pump. Its on the way.
The thermostat was removed. I also ordered one.