This is a jet ski yes ? to remove the engine off the impellor shaft all you do is diconnect all wires and cables etc , remove the exhaust from the manifold then remove the 4 engine mount bolts and lift the engine out and it will seperate from the driveshaft coupling ! strip the engine complete and check all crank and piston bearings , if ok then clean with petrol then put 2stroke oil in all bearings ! clean piston ring grooves and oil and refit , hone bores and check for damage ! check con rods are straight also ! clean everything and replace all gaskets and rebuild engine ! NEVER flush engine when not running as back feeds through exhaust !