Both motors work and have compression the small motor needs a the foot pump installed it runs great the other foot fits but requires a different grommet most parts are interchangeable for some parts but the big 7.5 motor runs but the bolt that goes to carb broke off letting air into the line causing it not to start bc it’s getting to much air so being sold as is but you can pull them and they want to start right up just need a little work and you will have two nice motors parts maybe $75 for everything you need to fix both just don’t need them anymore and don’t have the time also the last two pics are showing where in the carb the bolt broke off it goes up into the motor