How about an evo 300 4 cyl (was told smooth vibes)or a 3-w275 (was told vibration levels are too high)? Would it be like overpowering a 1.60 size plane with 50cc gas?,more power and not a horrible trade off in flying characteristics? The Yak needs nose weight and with enough weight up front I could use the front wing setting? maybe? Hate to start experimenting (read as spend a bunch of money) as the 3-W 200cc is having mojor probs. after couple more flights the hub slipped on the shaft. Hate to get another stinker.