Ok, i have a 5 yamy after some idiot stole my 10 4 stroke
in Stlucia, and i dismantle this engine 2 times to change 1 seal at the cranshaft and the 2 time for cowling sal deposits.
Take off all the 7 screws holding the engine to the top cowling , carburetor off, and becarefull because the electrical
coil and wires are screw it to the engine and the cowling to, so you need to unscrew 2 bolts from the engine or the cowling,
now, there is 2 gaps at the gasket
level in the engine , you can put a flat screw driver in this gap and other in the other one and make a catapult pull smooth to detach the engine from the bottom , i dont recomend to use sharp screwdrivers in the gasket
section, you can damaged the aluminium surfaces, just a couple of taps taps to move the thing 2 mm or 3 , with 2 persons are easy one pulling from the leg and the other from the flywheel , with the engine off, you can see now the end of the cooper
tube in the casing with a rubber gromet in the casing. Easy to replace...
Take the chance now to clean the salt
deposits, gaskets surfaces ... Hope this help, good luck.