old johnson 4hp year question

danny9696

Petty Officer 2nd Class
Joined
Jan 4, 2009
Messages
111
good morning all I have a few questions about a 4hp Johnson Model# 4R70E serial# E3189846. I just got this engine this morning and want to put it on my 14' flat bottom aluminum boat, I have a 80hp merc on it that I can take off if needed, the lakes around me are only rated for ten hp or less

1st can anyone tell me what year this is?

2nd what fuel mixture does it take?

3rd will it push a 14' boat at all?

4th does this have an impeller that needs to be replaced?

Thank you all for any and all help, I am very new to boating but I am hooked for life it seems, my wife thinks I am cheating on her with our boats, two years on the water and four boats later I guess that would make her think that

Danny
 

Vic.S

Rear Admiral
Joined
May 4, 2004
Messages
4,701
Re: old johnson 4hp year question

1st 1970

2nd 50:1 but does not have needle bearings throughout so maybe 24:1 Others will comment

3rd It'll push a 14ft boat at displacement speeds.

4th Its water cooled it has a pump. if not known when impeller last changed it'd be wise to change it DIAG HERE
 

danny9696

Petty Officer 2nd Class
Joined
Jan 4, 2009
Messages
111
Re: old johnson 4hp year question

Thank you vic I am so glad to hear from you on this, I hope some one gets back with us on the right oil mix I just ordered the water pump

Danny
 
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