I have a 28 hp evanrude Speeditwin. Mod.# 282003r Ser # 02778. I need a new carb. Because I think alot of parts on mine are worn out. I bought a rebuild kit but only had gaskets. It runs real rich, smokes like a train. The rich/ lean rods rotate when engine is running. Some of the screws to hold them inplace are missing. The exhaust is real white. and alot of black oil at the exhaust hole. And I didn't see it peeing the last time I got it running. Are there parts available or a differient carb that is interchangable? And do I need to get a new water pump? Any help for the old thing.