They made more than just a motor change on that bike. I think the Kawabusa and the GSXsaki that you are building is going to be two different animals. Wheight wise your bike sounds like the better deal, over all package it still needs alot of work. The Kawabua had a mono shock rear end, reinforced frame, and the bike just looked like a sleeper. It may still be to early in your build to tell how your bike will come out, but good luck. Stuffing a non stock motor in another factory's frame is a major undertaking, takes some real tallent.
they replaced on frame spar which didn't need to be replaced. I researched things indepth before taking on any task. ZRXdean is pushing over 300hp through a stock zrx frame....why did they need to strengthen it for 165hp...many guys making more than that with the base ZRX engine.
Yes 2 different animals.
Kawabusa: 165 rwhp, 550 lbs, hayabusa brakes (known to be weak), hayabusa suspension (known to be weak).
My project: under 500 lbs as of this date, radial brakes with wave rotors, 200 rwhp, gusseted upper frame, larger capacity radiator, stock capacity tank (kawabusa lost nearly a gallon), shortened wheelbase.
and as for a "sleeper".....anyone who is into zrx'es sees the mono shock and engine right away....lack of fins on the engine etc. When I tidy mine up it will look stock. The kawabusa also is green like 90% of the zrx'es....my blue is a stock color...but for only one year....'03. They offered green EVERY year.