Been There, Done That
I've hand-started my 1978 YSM-12 several times due to starter problems. It is not the easiest thing to do, because of the long reach in to the decompression lever. The basic procedure is to press the decompression lever, and start cranking (give the engine about 1/2 -3/4 throttle). Crank until your arm is ready to fall off and then release the lever while trying to crank through the compression stroke.You do need to BE CAREFUL of kickback on the handle as the compression starts. If the engine is cold it will take several attempts. It is doable and not fun, but it beats waiting for a tow.Good Luck