Yes, for some reason I've yet to have explained to me, the combustion temperature is much higher in a rotary than in a conventional reciprocating motor. My navigator, from my rallying days, had a mildly worked RX3/Savannah ex-rally car for club motorsport. In the 80's all the rotary's used to burn out conventional fibre glass mufflers very quickly due to the heat, muffler design have fortunately moved on. He navigated in this car a number of times with the previous owner and would recall how at night the back-fires would light-up the darkness of the forest, as unburnt fuel on overrun would be ignited by the heat in the exhaust system.
Spark plugs from memory were a triple electrode. At the time about $30 ea compared to the $6 NGK's I had in the Datsun. My 1988 GSXR750 has twin electrode spark plugs standard, which I think is pretty normal for performance bikes these days.