Things are finally looking up weatherwise now. I took both Cubs out for a little spin today that was much needed. My 53 has never smoked before, but now it smokes under load. I think I put seafoam in the gas last fall, could that be causing the smoke? It's not blue, and smells like raw fuel. I replaced the plugs this spring and they were all carboned up, but not gas or oil fouled. I'm really glad I got the 73 Cub, even though it needed a clutch and some tweeking. No funny noises, just smooth sailing with tight steering.