Thank you for your words of wisdom. Even though it would have cost money to re-do the threads and remove the plate, I decided to not spend another penny on this motor. This one motor has been nothing but grief. One problem after another, and I was tired of. It all started with the drive gear key disintegrating and wearing the shaft out of round, so I had to get a bottom end. The bottom end was not the right one because the stroke of the piston was to long. So I had to send the whole motor back to make sure it was right. then the chain was worn so badly, and I had to replace the chain and sprocket. Then I had to buy a second chain because the first chain was not the right length. then the clutch was over tightened when I got the motor, and I did not know it until it was too late. Then the clutch comes apart, ball bearings and all. I just wasn't going to put another penny into it.
I have ordered from Bike Berry a 5G 4 stroke, and it has been shipped already. I just ordered it this AM!!!! I hope I have made a decent choice.
Thank you for reading this. Dave