1973 Johnson 85hp

[eddy622611]

Going to look at a boat today, with 1973 Johnson 85hp. Any advise on what to look for? Is this a good year for this motor? The owner claims it runs well. Thanks, eddy622611

 

[Barnacle_Bill]

Re: 1973 Johnson 85hp

Most important is do a compression check. Check the condition of wiring. Look for signs of over heating. Check the lower unit for water intrusion.

 

[crb478]

Re: 1973 Johnson 85hp

Check compression on all four cylinders looking for over 100 psi and within ten percent oof each other. See how it cranks cold and then how it runs. They are good solid motors if cared for, but only share parts with the 73-77 series. Make sure it is indeed a 73 and not an earlier electric shift model

 

[eddy622611]

Re: 1973 Johnson 85hp

Thanks for the replies, When I check compression are there precautions so I do'nt burn up the ignition system? What type ignition system do thease motors have? Do the 73 models shift with cables? How will I tell for sure what year it is? Thanks again, eddy622611

 

[crb478]

Re: 1973 Johnson 85hp

Take out all of the plugs and either pull off the safety lanyard or keep the ignation off and jump the solenoid to turn it over. 73 models shift with cables

 

[eddy622611]

Re: 1973 Johnson 85hp

Thanks, The guy didn't call back yet . Hopefully I can go and look at it tomarrow. eddy622611

 

[emdsapmgr]

Re: 1973 Johnson 85hp

That particular engine ran fairly high compression when shipped from the factory. Around 125 lbs on each cyl.

 

[eddy622611]

Re: 1973 Johnson 85hp

Went and looked at the boat yesterday. It didn't work out, but thankyou to all that replied. eddy622611