The P just means projected electrode. Thr R means it has a 5k ohm resistor.
Plugs can have both, neither, or either. I run a bpmr7a plug, for example. You could run a BPR6HS. The only thing a projected electrode does is move the electrode tip out further a couple of MM out of the gas pocket to expose it to the fuel charge more. This makes the plug act slightly hotter than standard, so if you want to use a Projected electrode it may be a good idea for you to drop a heat range to a BPR7HS, which is what I basically run.
In my experience most cdi ignitions have a more consistent and stable spark when using a resistor plug or cap. Also quite handy if you have a radio lol.
Plugs can have both, neither, or either. I run a bpmr7a plug, for example. You could run a BPR6HS. The only thing a projected electrode does is move the electrode tip out further a couple of MM out of the gas pocket to expose it to the fuel charge more. This makes the plug act slightly hotter than standard, so if you want to use a Projected electrode it may be a good idea for you to drop a heat range to a BPR7HS, which is what I basically run.
In my experience most cdi ignitions have a more consistent and stable spark when using a resistor plug or cap. Also quite handy if you have a radio lol.