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2005 200 HPDI x2. I had the injectors cleaned for the first after about 12 years (620 hrs) and the reports said they were moderately dirty. I checked the Yamaha HPDI service schedule and injectors are not listed. I put 50-60 hours a year on the engines. Given their age, I'm thinking about having them cleaned every 3 years. What do the experts recommend?