Trying to find out the year of my old Johnson

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Author Topic:   Trying to find out the year of my old Johnson

THathaway posted 09-27-2008 03:42 PM ET (US)
I have a 40hp johnson outboard. The serial # is J 2,740,251.
I know it is a RK series but I do not know anything else about it. Any information would be very helpful in finding parts and what ratio to use.
thanks
Troy
seahorse posted 09-27-2008 10:21 PM ET (US)
What ar the two digits after the letters RK? We need that to find out the year.
THathaway posted 09-28-2008 07:05 AM ET (US)
The model # is missing. I know it is a RK series because it is electric. The guy I got it from had a book with the seriel #s for each year but it did not go up to the year for this outboard.
thanks
Troy
seahorse posted 09-28-2008 07:55 AM ET (US)
Let's try to narrow it down.
An offwhite (called French Silver) colored motor is a '62 through '66. Medium green motors came out in '67 and changed to dark green for '68 and later.
If the motor is offwhite, look at the carburetor. See if it has a water heated choke or a hot-air heated choke on it.
seahorse posted 09-28-2008 07:57 AM ET (US)
No matter what year you can use 50:1 in it as long as it's TC-W3 oil. Those motors had all roller and needle bearings in them which makes it OK.
The gear oil has to be the special Premium Blend available from any dealer.
THathaway posted 09-28-2008 08:05 AM ET (US)
the lower half is dark green. If I pick up a manual for late sixties to early seventies motor should I be fine. I need to find out how to replace a lower unit bearing and I also need to find out what each of the wires is for.
thanks again
Troy

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Author	Topic: Trying to find out the year of my old Johnson
THathaway	posted 09-27-2008 03:42 PM ET (US) I have a 40hp johnson outboard. The serial # is J 2,740,251. I know it is a RK series but I do not know anything else about it. Any information would be very helpful in finding parts and what ratio to use. thanks Troy
seahorse	posted 09-27-2008 10:21 PM ET (US) What ar the two digits after the letters RK? We need that to find out the year.
THathaway	posted 09-28-2008 07:05 AM ET (US) The model # is missing. I know it is a RK series because it is electric. The guy I got it from had a book with the seriel #s for each year but it did not go up to the year for this outboard. thanks Troy
seahorse	posted 09-28-2008 07:55 AM ET (US) Let's try to narrow it down. An offwhite (called French Silver) colored motor is a '62 through '66. Medium green motors came out in '67 and changed to dark green for '68 and later. If the motor is offwhite, look at the carburetor. See if it has a water heated choke or a hot-air heated choke on it.
seahorse	posted 09-28-2008 07:57 AM ET (US) No matter what year you can use 50:1 in it as long as it's TC-W3 oil. Those motors had all roller and needle bearings in them which makes it OK. The gear oil has to be the special Premium Blend available from any dealer.
THathaway	posted 09-28-2008 08:05 AM ET (US) the lower half is dark green. If I pick up a manual for late sixties to early seventies motor should I be fine. I need to find out how to replace a lower unit bearing and I also need to find out what each of the wires is for. thanks again Troy