I own a 2007 Piaggio MP3 250 i.e.
The stock OEM spark plug specified for this engine is the Champion RG4PHP.
When I look up the direct cross-reference online for the Champion RG4PHP, it points to the NGK CR9EIX (Iridium). However, when I search specifically for MP3 250 Iridium recommendations on ai, many posts suggest using the NGK CR8EIX.
I'm a bit confused between the two heat ranges (8 vs 9). What is the exact equivalent, and which one works better for this engine in real-world use? Any advice or personal experience would be greatly appreciated!
Thanks!
