Honestly man, I’m not 100% sure of the part number as I ordered a maintenance kit online that came with 2 quarts of Kawasaki oil and oil filter and air filter with a fuel filter and two plugs. I do know that the plugs that came with the kit were NGK’s. I’ll have to check tomorrow morning when I get home from work and give you the exact part number.Nice, which plug does it take? Where did you buy from?
I just did a bit of a deep dive on some NGK in the last two days (thanks forum) and found out that they seem to be changing their number system. I found approx 35 part numbers that can fit a typical BKR5ES (BCPR5ES) application and was able to whittle that down to some useful information.
Most of the iridium plugs have a standard ground electrode (steel) and I think all the ruthenium were dual (platinum ground). To me the best deal is absolutely the G-Power platinum (standard ground) as all the plugs with platinum ground, regardless of center tip, are double or triple the money. I have no issue paying 50% more for platinum but it would make sense that adding another platinum tip (Laser plug) would cost the same increase, not 100% more of a whole single platinum plug (G-Power).
For waste-spark ignition systems, dual-tips are definitely the way to go but the price increase doesn't add up. If you're OK with a 50k mile plug then a single tip is fine and I don't see the value in iridium or ruthenium over platinum.
Edit: NGK has an app that you input the information on for your equipment and it will give you the exact compatible part numbers, which is where I found the plug number for the plug for my Generac pictured in the opening post. The four pack that I ordered specifically for the generator was bought on eBay.