You can find a good jet boat mechanic in Seattle at Seattle Boat Co. They are situated at 13203 NE 16th St, Ste A, Bellevue, WA 98005. The service center is listed for nearby cities and attractions including Bellevue, Bellingham and Seattle. Contact them to see if they offer the boat repair service you are seeking. For more information, visit http://www.mechanicadvisor.com/wa/seattle/boat-supplies.