Re: Spark plug information
My vote goes to NGK. According to chart Champion L77JC4 cross ref to NGK B7HS-10. NGK seems to last longer less fouling out in oily 2 strokes.
Re: Spark plug information
Go to [url]www.fastbass.com[/url] and ask those guys under the "technical forum". Somebody on their always knows the answer to boat and and engine stuff.
Also, you could try [url]www.bassboatcentral.com[/url] and go to their forum and ask. I don't know the difference of those part numbers. I also like NGK plugs, but Champions work just fine in a boat engine---would not ever put them in a car, but they seem to do well in boat engines. Good Luck.