I have a guy that gave me a lawnboy silver addition mower that he put straight gas in it and it froze up on him.. what is the fix for this? Or isent there any fix

Hello randy

Check if the motor will turn at all if hand cranked.
With straight gas the motor will have overheated and got stuck.
If so, open the cylinder head (try first removing sparkplug) and spray in some penetration oil. Hopefully that allows you to crank the motor after a couple of days.