I've been really been thinking of ways to crack down on weight as well.
Ditch the kick assembly and set up for bump start, plastic side cover, titanium clutch push rod and any hardware can be switched inside and out of the motor, ditch the oil splash guides, machine the cutch cover. For you drag only guys ditching the radiator you can just nix the water pomp assembly. need to seal it though. There is weight to be saved by ditching the OEM flywheel and stator for a PVL, but to some the learning curve isn't worth the weight savings.