1974 Johnson 70hp "looper" plugs

[blueboat1]

I have 70hp 1974 Johnson. The local shops i have called have all given me different recomendations on what the best spark plug is for my motor. The last time this happened they gave me a set of plugs that killed the power pack on my 6 hp. What plugs are you running (if you have this year/hp) and what is your main use. I use my boat for fishing/trolling. Any info is appreciated. hope all had a wonderful (wild) turkey day.

 

[rickdb1boat]

Re: 1974 Johnson 70hp "looper" plugs

This should help.<br /><br /> web page

 

[rickdb1boat]

Re: 1974 Johnson 70hp "looper" plugs

Got a model number for that motor? Don't see a 74' 70 HP on that chart.

 

[ezeke]

Re: 1974 Johnson 70hp "looper" plugs

The Clymer manual recommended plug for the 1974 70HP Johnson is a CHAMPION UL77V.

 

[ezeke]

Re: 1974 Johnson 70hp "looper" plugs

If your J/E Dealer can't supply them, you can get the plugs here: Plugs

 

[blueboat1]

Re: 1974 Johnson 70hp "looper" plugs

Thanks for all your help. <br />scott

 

[Dhadley]

Re: 1974 Johnson 70hp "looper" plugs

On todays fuel the Champion L77JC4's will work very well.<br /><br />Good luck!

 

[Joe Reeves]

Re: 1974 Johnson 70hp "looper" plugs

On the 1974 OMC outboards, my thoughts coincide with Dhadley's suggestion of using Champion L77JC4 plugs. Set the gap to .040 .<br /><br />You can also use the Champion QL77JC4 plugs with the same gap setting. The "Q" indicates that it is a resistor type plug that, to a point, restricts interference with any electronic equipment.