secondary injectors arent in use over 5500 unless your wide open throttle. They arent spraying on Partial throttle.Knightslugger said:it's the combination of your style and your RPMs. All 8 injectors are working after 5k RPM. if you're riding highway, you should be in 6th gear to conserve fuel. The engine can occasionally take 15000 RPMs, that doesn't mean anywhere in between there is safe. You keep that up and you'll spin your bearings out.