Sorry to thread - jack but is there anything particularly bad with using a bpr7es plug on my fireball? I haven't fully tuned it up yet and I'm not using a power arc, but a trispark. Everything seems good but I don't want to damage anything! Pardon my ignorance..
Using a bpr7es plug would be potentially fatal for a fireball for 2 reasons.
The first reason being that the 7 heat range is too hot a plug for a stock bike let alone a high compression setup like the fireball. The flame front on a high compression bike burns hotter already so introducing the hotter plug creates the perfect situation for preignition and/or detonation.
The second reason being the p designation which stands for 'projected tip'. A projected tip sparks deeper into the combustion chamber, essentially advancing the flame front. It ignites the mixture sooner in the combustion chamber during the compression stroke. This alone is not desirable on a fireball setup but combined with a 7 heat range plug, it's a double whammy.
The projected bp8es/brp8es is sometimes beneficial on stock setups that arent driven at higher rpms because it allows the need for less advance creating easier starting as well as giving a low rpm boost in torque at the tradeoff of ragged higher rpm running. A br8es is better on stock setups where the entire revrange is used.
A high compression motor naturally needs less advance to efficiently burn it's mixture so the projected tip does no good and can only do harm.
Now, I am sure you havent done any damage to your motor. You're probably still running it, doing short runs which should include short acceleration and deceleration bursts, while not holding the throttle wide open or keeping it pegged in one rpm for long. Also your rings probably haven't yet built up enough cylinder compression yet to really force a catastrophe but do swap those plugs asap before they do.
The trispark is a digital electronic ignition which requires a resister plug to function so the br8es or br8eix is what would be best.
The powerarc and the boyer micro digital are also digital setups which require resister equipped plugs. The boyer mk3 and mk4 are analog/solid state units which do well without suppressed plugs. As do points of course.