What Spark plugs do I need? 1978 35 HP Johnson

[Andyfender]

I was on the water today and my engine would not give me full throttle. When I cam home I pulled the plugs on my 1978 Johnson 35 HP. One plug the ceramic insulator was totally broken off. The other plug the ground electrode was broken off. The plugs were Champion UL77V. They are not marine plugs, nor do I know if they are correct plugs! What plugs do I need?


Thanks,
Andy

 

[Jet35]

Re: What Spark plugs do I need? 1978 35 HP Johnson

go to www.iboats.com/johnson-champi...view id.66992 good refrences here for all that need spark plug needs.

the plug you need is L77JC4 gap=0.03

 

[ezeke]

Re: What Spark plugs do I need? 1978 35 HP Johnson

Currently, the Champion QL77JC4 is recommended. Gap at .030.

BTW, plugs with a V in the number are surface gap plugs and don't have the extended electrode. http://members.iinet.net.au/~pauldawson/iame26-spark-plugs.PDF

 

[Andyfender]

Re: What Spark plugs do I need? 1978 35 HP Johnson

Thanks!