Can I replace the UL77V plugs in my 1985 Johnson 175 V6 with L77JC4 plugs? I'm looking for a plug that won't foul as easily at lower speeds. If so, what gap? If not, what other plug?
You may want to try a synthetic, or synthetic blend oil if you're using conventional 2-stroke oil. Usually much better on the plug fouling. If you're not sure, start a new post about oil types and smart folks will chime in. I also heard that opening the plug gap slightly would help, but unsure on that. Good luck!
Check with Silvertip. He put me onto a conventional plug that I have been running for 2 years and have had excellent results in the area you mentioned over my OEM surface gaps.
Additionally, as mentioned, I use Merc's best 2 cycle oil that is probably synthetic but they don't admit to it. By the performance, engine cylinder and plug hygiene, and minimum smoking, it has to be.
