I recently purchased a boat with a 2004 Evinrude 225 HO - I am putting new plugs in the engine. BRP calls for QC12WEP although in the engine is QC10WEP. I know the only difference is the heat range. Was there any advantage for the 10's to be in the engine? Is it better to run a little cooler plug? Should I see a change in performance vs. each plug.
I am having difficulty locating the Champion QC10WEP...also known as 9005 locally for pick up...is there a good cross referenced ,plug that will work as well or better? Maybe an NGK plug?
Thank you for your time!