Is it worth it? Basically I need a good donor bike & all I need is a very good, clean engine. The rest I will just part out. His ad reads "1981 HONDA CB650 complete bike, clean, nds elec work, $600". Now I am going to look at it so i will see how clean it really is. My question is if it doesn't start is it worth $600? It could just need carbs cleaned & new gas OR engine could be seized. So what should I offer? And if engine is bad, is it expensive to have someone rebuild it? I once looked at a cb550 that looked nice in a photo & he was asking $800. I looked at it & it wouldn't start & I saw some minor rust & my "gut" said no way - too much. I don't know what it needs. Then I never heard from him. Months later it turns out a friend purchased it for much less & ended up cleaning carbs, new battery & gas & it started up real good. He took the risk & it paid off. So... should I take the risk? How much do I offer for a non running bike? Also am I better off getting the engine separately? I don't forsee using ANY other parts other than engine for my new bobber I am building. But if I see a engine for a good price, how do I know it runs? Again I guess it is all a risk. Any help would be appreciated.