Hi there planetminis, I just got a 04 NSR50 that I purchased on eBay about a year ago now. I am toying with the idea of converting it into a NSF100. So I was wondering what the original motor fetch in price? The bike has less than three hours total on it, that's what the original owner told me... Very clean everything looks brand new! I would guess I would be swapping out exhaust, electrical system and anything else I would not to be using on the original NSR50. Or am I better off keeping the original motor with the bike as a spare engine?