Johnson OD - 18 10 hp motor

[wingnut1234]

I got another one. Johnson OD-18 motor. 10 hp. DOes anyone know the year and fuel mix? I think it is a 1957 Ontario motor. Not sure on the mix.

 

[bankerjohn]

Re: Johnson OD - 18 10 hp motor

If it's a 1957 10hp model, the model # is QD-18

 

[F_R]

Re: Johnson OD - 18 10 hp motor

If it's a 1957 10hp model, the model # is QD-18

Fuel mix is 24:1. Don't cheat on that one because they are rough on the wrist pins in the pistons.

 

[JB]

Re: Johnson OD - 18 10 hp motor

Fuel mix is either 20:1 or 24:1; too close together to quibble about.

I would go with 24:1 simply because a quart of TC-W3 is an easy quantity to manage and 38.4 ounces is a pain to measure.