Bought a 98 kawasaki 1100 stx for the kids on my street so I can pull them wakeboarding etc. It hadn't run since 06 or so and was from Miami so definitely a saltwater ski. It started but a lot of oil came out of the back. I drained all the fuel and refilled and put Amsoil synth oil in it and changed the plugs. I changed the fuel filter since it looked original. It ran great for about 20 minutes and began to slow at top speed as the engine felt like it ran out of fuel. It ran very strong going through markers I put in the lake and spinning out and then it would just die. The only way it would start would be to choke it and then sometimes it would idle and die when I gave it throttle or it would just die right after it started. Feathering the throttle didn't do much. If I gave it throttle with the choke pulled it would run hard briefly. As a lawyer, I try to give back what I can to the community and it was tough telling the kids the ski quit after they were so excited. I have a great deal of experience with cars and mechanicals as I own a restoration shop. I can do the work, just need some advice. Thanks.