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if i do decide to go with the cannon style plug how many pin plug will i need. all thats on the motor is starter, alternator, electric choke, temp sensor, oil pressure sending unit, and the shift kill switch. Plus of course distributor and coil.

thats pretty much what it is.

did this engine have a connon plug on it when it was new. this engine is a 1977, the boat is an 1985. should i get a new wire harnnes. my son wants to rewire the boat because of the mess.

I dont have the cylinder style. i have the square one that looks like a box where do i connect it too.

Thats the thing i dont have a plug like that, all i have is a wire harness that ties into a wire block on a plate that is still in the boat. so i dont have a wire harness on the engine. the picture show how its connected to the battery power when its in the boat. left side of picture.

serial number 4920382 back story on the engine it started knocking last year. so we pulled it. Piston 3 was broke. we sent the block and the head out to a machine shop and they did their thing. Me and son just finished up rebuilding the engine and we want to start it and run it before we put it...

that looks like really old gas to me.

i forgot I had a close up pic of it on my phone

If this isn't the correct one should I order a Pertronic unit

Thats not what it looks like. here is a pic of it. It has a blue rotor.

the only reason i ask is that when i cleaned the carb the paint on the carb was coming off with the carb cleaner. so i stripped the carb of all paint and figure why repaint it. speacialy if I have to clean it again

so it looks like 9.9 to 20ph is what most are suggesting. it would also be used to get us back if the main engine dies. thanks guys.

good question. there is an ignition module on the distributor looks just like a car setup. I don't know what the numbers are on it. The boat is still in it's winter cocoon.

Electronic ignition

I don’t have points It was changed over before I bought it Thanks for the info

Mercruiser 3.0 140hp

Finishing up putting the engine back together. Serial number 4920382 What temp thermostat is recommended

isnt the carb made from cast aluminum

ok thanks

I fish Lake Michigan.