My friend just picked up 2 three wheelers and they haven't been ridden in like 4 years. What would need to be done before we can test them out. I know we should drain the tanks and take apart the carb to clean them. We are going to drain the tranny fluid and refill them but not sure what would be good to run in those. I will lube all the cables and check the chains. I will clean the air filters and spark plugs. AQny thing I'm missing?