John Deere Z425 Remove Electric Clutch

Hi everyone, I'm new to the group. I'm working on a friends mower and I have run into a problem. I'm replacing the bracket that goes to both, R & L transmissions. It broke causing the wheels to angle in. I also have to replace the plate the engine bolts to, it broke where the transmission is mounted to it. I'm trying to remove the electric clutch and the bolt is frozen in place. Is the bolt that holds the electric clutch on, reverse thread? Also what size is the washer you put the wrench on to keep the crank from turning? I'm gonna have to buy a wrench to get it off. Thank you in advance for any help.

Plain old RH thread'best trick is a big impact gun.
Failing that rotete the engine till the inlet just closes.
Stuff some soft rope down the plug hole to fill the barrel.
slowly rotate the bolt to compress the piston into the rope then find a long length of pipe to go over the wrench handle.
Do not use a hammer as shock loads with the piston pegger can bend conrods.