New Duke 390 has extensive use of alloy, including light wheels & brakes (unsprung weight), and as a thumper weighs 324 lbs. wet. The new Ninja 300R twin doesn't have these advantages and weighs 378 lbs. wet. It would take a pretty high-tech (I want one!) 500 Twin to hold the weight down to 350 lbs. wet.
Another reference point: The 2012 (higher-tech) Duke 690 thumper weighs 352 lbs. wet. I think 385 lbs. would be a better target for a twin, which is still 40 lbs. lighter than my NT650 Hawk GT (425 lbs. wet). Going back to another thread, the Japan-only 400cc super-sports barely make the 385 lb. target.
1990 Honda NT-650 Hawk-GT
Never doubt that a small group of thoughtful, committed citizens can change the world;
indeed, it's the only thing that ever has. - Margaret Mead
Gryphon12 screwed with this post 01-16-2013 at 04:39 PM