information on johnson 70hp

[WINDGAGE]

Could anyone please give me some information or possible faults with the above outboard with serial no,s of<br />70EL74M C - 9435<br />runs well, but i unfortunatly know absolutly nothing when it comes to outboards though i've been a mechanic all my life!!.<br />And could some one also be as kind to tell me the correct fuel/oil mix( i do not want to gain experience from a re-build)<br />many thanks<br />windgage.

 

[JB]

Re: information on johnson 70hp

Howdy, WG.<br /><br />Your mix should be 50:1. .5 litres TC-W3 outboard oil to 25 litres 91 octane (RON) petrol in a "standard" outboard tank.<br /><br />Your engine is a 1974 model.<br /><br />I recommend a Repair Manual. Click on Repair Manuals at the bottom of the page.<br /><br />Good luck.

 

[WINDGAGE]

Re: information on johnson 70hp

Thanks j.b for the speedy reply, i'll go and order the repair manual but i hope that doesn,t<br />mean i'll have to use it to much???.<br />While im waiting for the manual do you mind if i <br />ask a couple of questions.<br />a. what would the spark plug gap be?<br />b. is there any thing that usually goes wrong with this type of engine.<br />c. and does the lower end gears just run in normal hypoid gear oil?<br />sorry for the interigation<br />regards<br />WG