Parts Manuals – YAMAHA Four Stoke Outboards by year Unsure what year your engine was manufactured? Use our model guide to help! Please select your engine size: 2.5HP4HP5HP6HP8HP9.9HP13.5HP 15HP20HP25HP30HP40HP50HP60HP 70HP75HP80HP100HP115HP130HP150HP 175HP200HP225HP250HP300HP375HP425HP