As I said earlier, I bought the 1800TF with a GT150. Last owner says it does up to mid 50's. When I took a compression reading, all cylinders were perfectly equal at 92. I know the pistons and cylinders are in good shape, but a shop tech said I should be reading around 120-130. The last owner used cheap 2 cycle oil. I think there is carbon deposits. I treated the engine generously as suggested with OMC powertuner and am going to clean it out tonight. I should pick up compression. If I do, I should also pick up some speed as well, right? Can I top 60 mph with this rig or am I just dreaming?