id say your water pump (rubber impeller) in the lower unit has dry rotted, not much of a job to replace call any boat place advertising Johnson motors they can direct you, try google search: Louisville Johnson Outboard motors
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Hi,
I've got a 30 year old Jonston 20 that needs a good going through. Any recomendations in or around Louisville? The thing starts fine but seems to over heat quickly, just a guess.
Thanks, Steve
id say your water pump (rubber impeller) in the lower unit has dry rotted, not much of a job to replace call any boat place advertising Johnson motors they can direct you, try google search: Louisville Johnson Outboard motors
may just need a new thermostat,just replaced mine on my 1977 70hp hope this helps
I have had excellent service out of Creekside Marine in Taylorsville, KY. They will service most brands of motors.
Best of Luck,
Bumblebee
Jeff at Creekside Marine in Taylorsville. 477-5204