To turn engine park on centre stand, put in top and take the spark plugs out.
To remove the timing gear for changing oil seal.
Park on side stand with gearbox in top gear and back wheel chocked. Use a breaker bar on socket. Weight of bike on its wheels moves the front shock bottom end outwards just enough to make space for a socket spanner & handle.
Press rear brake to stop wheel turning while pulling the breaker bar.
Reassembly needs a torque wrench. Same technique.
Sent somehow.