Keyboardman
Petty Officer 1st Class
- Joined
- Sep 10, 2015
- Messages
- 360
Hi guys, The factory service manual for my '74 Johnson 50 says to use a Champion UL-77V surface gap type plug which I'm currently running. While talking to a mechanic friend of mine he suggested using a standard type Champion QL77JC4 plug instead. He said that later on they found out that a surface gap type plug wasn't really necessary or even beneficial to performance. I'm wondering if anyone had any comments on this matter. Thanks,
