What year is my Johnson?

[57SpeedQ]

First, thank you for everyone that answers posts on this forum. I belong to other forums, Jeep, and appreciate the wealth of knowledge that everyone brings. I have yet another "what year is this?". I bought a '57 Glastex Speed Queen off of Craigslist with a Johnson motor. Previous owner had no clue what motor it was. He was told it was a newer 70 hp. The data plate is missing and there is nothing on the freeze plug or any type of metallic disk on the engine. Here are some of the numbers I have found:

317148 - electrical panel
318434 - lower motor cover
317219 - thermostat housing

and what looks like 1890 3.JQ1 stamped on the mount.

I think it's a '73 65 hp. If it is, what seperates the different models for that year?

Thanks.

Edit: I did find one number on a freeze plug(?) on the top of the motor. J3835225. It has a large M above the number.

Thanks.

 

[57SpeedQ]

Re: What year is my Johnson?

A couple of other questions. I do not have a temp guage or working tach. There is a tach and I think it is the original one. How would I hook up either and are both necessary? There is a wire on the head next to the thermostat housing that I suspect is the temp guage lead. It had been cut by one of the previous owners.

Thanks.

 

[domwebhost]

Re: What year is my Johnson?

Possible years and models:

---1973 65 HP---

1973 65372R
1973 65373R
1973 65ES73R
1973 65ESL73R

1974 --70HP--

1974 70442M
1974 70443M
1974 70472M
1974 70473M
1974 70ES74M
1974 70ESL74M
1974 70ESLR74M

Hope this helps, if I find anymore info I will post it

 

[57SpeedQ]

Re: What year is my Johnson?

Thank you for the response. If I find any other information I will post it.