Hello all, I've just bought a 2024 nitro 300. What spark plug should I run as I was told in my 2018 vertigo to run the hotter BPMR4A rather than the BPMR6A. Do you still need to do this on the newer bikes?

Many thanks 

On 9/2/2025 at 10:21 PM, evo boy said:

Hello all, I've just bought a 2024 nitro 300. What spark plug should I run as I was told in my 2018 vertigo to run the hotter BPMR4A rather than the BPMR6A. Do you still need to do this on the newer bikes?

Many thanks 

Hi mate did you get any results using a R4A plug. I just purchased a 300 JBR and was thinking about using a No4 plug. 

Edited November 21, 2025Nov 21 by Warren-s

Evening mate. No didn't get any reply so stuck with the standard plug but will try a 4 soon