Reply to Hour's question
I asked the same question about my Kawasaki engine on my Hustler Raptor after reading the manual. My question was answered directly from Hustler and they said to follow the Hustler manual interval changes. The Kawasaki Manual is a broad general service interval and doesn't always take into account the heat and dust that the engine would endure when placed on a mower vs. a "cleaner" working environment. Hope that helps.