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FYI here's some 600cc sportbike wheel assembly weights for you to think about. They'll be lighter than the parts you bought.
2009 600cc sportbike shootout, RRW 04/2009
wheels with brake rotors and matching test tires (Bridgestone BT-
003 Racing) but without axles, spacers, cush drives or sprockets:
Honda lightest, 23lbf front, 25 lbf rear
Suzuki, 25/27
Kawasaki 26/27
Yamaha 25/28
So the Honda is 5 lbf total less than the Yamaha.
After you get it runing you might consider lighter wheels. The EX250 Kawasaki wheels are pretty light for a "learner" bike. I was surprised when I weighed them on an EX race project bike. The later ones have 17" tires instead of 16" which makes it easier to find good tires. You might also consider the Suzuki GS500 wheels. Both of those bikes run narrower tires (less drag than the tires for the 600 class 3.5" front/4.5-5.5" rear rims) and there's lots of them around so the parts shouldn't be too expensive. The tires won't necessarily be lighter though, as the modern 600cc radial sport tires are surprising light, especially if compared to a bias ply "commuter" tire.
cheers,
Michael
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