what year is it?

[obpurdy]

bought a johnson 6 hp. today. older motor, fired right up and ran good foward and back shifted good for $200.00 dollers. think i did okay. he couldnt tell me the year so hopefully one of you can help. model #6r-72d serial# j3562074. also any thing you know about the motor ;things to look out for,problems,would be helpfull. thanks

 

[kenmyfam]

Re: what year is it?

6 HP 1972 from what i get.
Basic health check would be a good idea.
Compression
Spark
Fuel delivery
Plug condition

 

[Barnacle_Bill]

Re: what year is it?

6r-72d indicates it is a 1972 but for some reason I can't verify that.

 

[kenmyfam]

Re: what year is it?

6r-72d indicates it is a 1972 but for some reason I can't verify that.

Go on !!!! Be bold !!!! Verify it !!!!!

 

[obpurdy]

Re: what year is it?

thanks thats what i got when i googled it. will a car compression gauge work like you get at autozone?

 

[kenmyfam]

Re: what year is it?

thanks thats what i got when i googled it. will a car compression gauge work like you get at autozone?

Absolutely as long as you have the correct thread for your plugs and the correct reach. If you use a over long reach then the pistons could hit it. Bottom line is the compression tester adaptor that goes in the plug hole should not have a longer thread depth than your spark plugs.

 

[obpurdy]

Re: what year is it?

thanks for everyones help.

 

[jay_merrill]

Re: what year is it?

6R72D indicates a 1972 motor and I'll verify that! Your paint color should be light green (previous green was the darker Forest Green) and the cover should be white with an orange and black decal on each side. The orange decal should have the numeral "6" and the black square should have the seahorse logo. The word "Johnson" will be in black lettering.

Johnson celebrated its 50th anniversary in 1972, so some motors have "50th anniversary series" on the front of the hood. I don't think the 6hp models did, though.

I would consider $200 for a well running and good condition 1972 Johnson 6hp to be a good price. One thing I would do, unless the previous owner told you that it has been done recently, is to change the water pump impeller. The motor also has a thermostat in it (port side of head at the top, look for triangular cover with 3 bolts), so you should verify that it is working properly.

Nice motor - have fun with itt!



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