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So ten years ago my dad got in a pretty bad accident well snowmobiling and well put both the snowmobiles in the garage after and havent been touched since. I decided that i want to get them back running and be able to take them out. What kind of things do I have to do to get a engine going after being sat for 10 years (gas and oil was not drained) they are a 1994 and 1998 Yamaha Vmax 600. Thanks!