OK I installed it with a new gasket and new BP5HS.
I thought I might blow my original 1+ year old regular front freewheel out starting my bike. The compression felt higher on start pedaling, but not HUGE. The strange thing is the bike seemed to want to start faster, but that's probably just a new plug thing.
So I let it warm a bit and just putted down the road and back. All seemed well. Off for some throttle action.
Wow. Whoa. Brain rush. The engine has more low end and goes to top RPM much faster. I just whip through the gears and was pulling my biggest hill in 5th, before maybe 3rd gear max.
NICE $22 investment!!
But I think I've reached my clutch limit......it slips, or when I tighten it, it grabs "too soon" - ie when pushing the bike with clutch pulled fully in. I need to design some hi po clutch pucks.