I have a 2002 Road King Classic, almost 2000 miles on the Big Bore Stage 2 installation, that, once it is warmed up, it REALLY pings from about 2200 to 3000 rpm. This is especially bad when it's under load, like going up a hill. I know this is very damaging to the engine. I always have used 91 or 92 octane premium fuel. Any hints or info would be greatly appreciated!!