I think if you look at the size of the engine relative to the rest of the bike you'll see where the weight is. Its probably all made out of steel. I think thats probably an extra 50# give or take. Then the wheels, the mirrors weigh in at 1.5 lbs, the stock exhaust is 18lbs (not including the head pipes). The airbox is around 6lbs, pollution cans & hose is another 5lbs or so. I hope that gives you an idea of where the weight is. You can easily drop 25lbs from your bike if you want to. If you want to spend some $$ get the Oz rims.