NGK (7669) CR8HIX Iridium IX Spark Plug, Pack of 1
https://www.amazon.com/dp/B000HDF852..._D8DIzb27VN53A
keep in mind I have a PreGen, a NewGen calls for a different plug.
IIRC, but double check to be sure, I know that PreGen take a small thread size, as the NewGen use big threads
NGK (4218) CR8EIX Iridium IX Spark Plug, Pack of 1
https://www.amazon.com/dp/B000VZJ712..._bkEIzbAC9CCWV