Help with motor year I.d. On 20 hp Johnson

FishHunter · Mar 8, 2013

Trying to Id this 20 hp Johnson motor that is on a 1959 14 foot sea king boat I bought. Looks newer than 1959? There is a serial plate inside that i can look for as well.

It has been sitting a few years. What should I make sure to replace before trying to fire her up? I decked and carpeted this thing (nothing too great) that I will post as well.

FishHunter · Mar 8, 2013

There is a small silver plate on the motor under the cover that has E3417714 on it. I am guessing this is the serial number? Sorry, new boat owner here (other than canoe/raft/float tube) so I am just getting caught up with this stuff. Thanks in advance for your guys' help.

jasper60103 · Mar 8, 2013

Get the model number off the tag on the side of the transom clamp.

FishHunter · Mar 8, 2013

Perfect, thanks! 20R71S. 1971 short shaft.

Now that I know the year so I can purchase/replace parts, what is standard replacement on a motor that has sat for a few years? I will be getting a new gas tank and gas lines so I don't get anything in the motor that is sitting on those things.

JMichael · Mar 9, 2013

Water pump impeller for sure, and most likely need to clean the carb. Might need to rebuild fuel pump and check out any fuel lines for cracks/dry rot. Make sure the mice haven't made a meal of the wiring insulation. If that motor has points you might need to replace points/condenser. Check lower unit oil for water and fix any issues and replace the lower unit oil.

dkonrai · Mar 9, 2013

i have a similar motor, and i just resealed the lower unit. highly reccomend the reseal. pretty easy.
dino

Help with motor year I.d. On 20 hp Johnson

Help Support TinBoats.net:

FishHunter

Member

Attachments

FishHunter

Member

jasper60103

Well-known member

FishHunter

Member

JMichael

Well-known member

dkonrai

Well-known member

Similar threads

Latest posts

Help with motor year I.d. On 20 hp Johnson

Help Support TinBoats.net:

FishHunter

Member

Attachments

FishHunter

Member

jasper60103

Well-known member

FishHunter

Member

JMichael

Well-known member

dkonrai

Well-known member

Similar threads

Latest posts

Join the conversation!

Join today and get all the highlights of this community direct to your inbox. It's FREE!