1992-1998 Kawasaki PWC Jet Ski Service Repair Manual., Page 193Get this manual
12- Coat the upper portion of each piston and rings with 2-stroke engine oil13- Obtain special ring keeper toolSecure it to the No, pistonCheck to be SURE the ring gap straddles the locating pinSLOWLY lower the cylinder block down over the long studs over the piston crown14- Guide the piston to start into the boreOnce the piston is positioned within the bore, remove the ring keeper toolSecure the ring keeper to the No3 pistonIf second ring keeper tool is available, secure it to the No1 pistonWith the help of an assistant, guide the pistons to start into the cylinder block as it is loweredOnce the pistons have started irio the bores, remove the ring keeper toolsIf the ring keeper tool is not available, squeeze the rings inward around the locating pin and guide the pistons into the
CRITICAL WORDS If difficulty is experienced in fitting the pistons into the cylinders, DO NOT use forceSuch action might result in broken piston ringCheck to be sure each ring end gap straddies the locating pin