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2000 25hp four stroke yam/merc parts needed,one rod/crankshaft/flywheel needed for power head that has two cylinders,plus one balance piston in front of crankshaft.crankshaft has both journals tdc at same time.my flywheel has broken magnuts.(stamped Korea on top).this twin cylinder engine has side carb.these motors made from 1998 thru2006 Yamaha and 1998 to 2005 in merc APROX)-thanx -th