I changed my thermostat, spark plugs and wires this weekend (did not change dizzy cap or button) and I swear I have more power and better response. Now granted not a lot but definitely some. Before at 2500 RPM's I was at 65mph and now I am at 67mph. Before when I pressed the gas the engine would be some what slow to get going now she jumps with excitement. Definitely not a lot but enough that I can notice a difference.