How much weight in the nose did it take to balance it? What was your all up weight minus fuel? I just got my wings glued together tonight with servo's installed. I read so many posts on zeros saying you had to add a lot of weight to the nose and many were just opting to hang a bigger engine out there instead. So I talked myself into buying a lightly used O.S. 91 surpass four stroke. The engine is about 23 oz with muffler as compared to a TT .46 which is 17 oz with muffler. Its my first four stroke and I can already see some challenges. Like having the carb behind the engine. I think I am going to have to cut into the firewall so the engine can fit futher back. I am sure it will be interesting. Hopefully the extra 6oz in motor isn't too much. I am also going to try out a 3-blade prop.