Proper spark plug?

[Ronniewhite]

I have a 2000 Johnson 25hp 3cylinder. The sticker shows QL82C. But the Johnson spark plug guide says QL86C. Is there a difference and which one should I use?

 

[Vic.S]

QL86C is a hotter plug than QL82C

Some lists say one other lists say the other
The one I take as correct is https://continuouswave.com/whaler/reference/BRP/SparkPlugChart2008.pdf which says QL82C. but it is possible that there has been a change since that was produced in 2009.

If the Johnson guide you refer to is a later, and official, list go with its recommendations otherwise stay with the original QL82C unless you have trouble with plug fouling with prolonged low speed running. In which case try QL86C.