Should be post # 2 problem due to last person going in there. Remove the small access cover to see the coupling.
My screws had no S S lock washers. I bought 2 at a hardware store. I took 1 bolt with me to get the right size.
Remove plate on side of exhaust housing.-----Make sure notches on shift rods are lined up with the hole.----Put screws back in.----Check shift adjustment at shift lever on side of the motor.