i have a 92 750 whit 20/39 gear green hauck primary clutch spring 89 -10 wheight whit 4.5 weight in 2 hole secondary stock spring helix 39 deg i start good my rpm is 8000 -8100 at 20 mph my rpm drop at 7000 wtff my top speed is 85 mph at 8400 why my rpm drop :help::help::help: i have a...