I just bought a 1997 Yamaha GP 1200 and a 2000 Kawasaki SXi 1100 that had been sitting for a couple of years. I put new batteries on them, put some gas in the tank and made sure oil was in the reservoir and they both cranked right up and run well while on the trailer. I am going to take them to the lake this weekend and am wanting to know how to tell if the oil is being mixed with the fuel. I pulled the plugs and the they are a little black so i would think that would tell me the oil is being mixed. My current plan is to clean up the plugs before i go out on the water and check them after running them for about an hour. Any thoughts??