Bombardier SeaDoo 1996 factory shop manual, Page 52Get this manual
Section 04 ENGINE Sub-Section 02 (TOP END)
ENGINE DESCRIPTION
587, 717 and 787 Engines The 2-stroke ROTAX engine rotates counterclockwise seen from the rear (PTO flywheel)It has rotary valve to control opening and closing of intakeLubrication is provided by variable rate oil injection pumpIt is cooled by water supplied from the jet pumpIt has NIPPONDENSO Capacitor Discharge Ignition SystemThe fuel is provided by diaphragm MIKUNI carburetor(s) having an integrated fuel pumpCAUTIONNo engine components can be interchanged between engines
1,2, Cylinder Head Cover and Cylinder Head
Remove cylinder head coverNOTEWith the 717 and 787 engines, cylinder head screws secure also cylinder head coverIf shells, sand, salt or any other particles are present in cylinder head, clean with vacuum cleanerRemove cylinder headIf shells, sand, salt water or any other particles are present in cylinder cooling jacket, clean with vacuum cleanerRemove cylinders, being careful that connecting rods do not hit crankcase edgeWARNINGIf screws need to be heated for removal when engine is in watercraft, fuel system pressurization must be done firstDo not use open flameuse heat gunNOTEEven if only one cylinder needs repair, both cylinders should be lifted to allow 1-piece cylinder base gasket replacement-