I believe the engine is the original 2.5 hp Briggs I never looked to closely at it I will confirm that this evening when I get home. Yes it is a clutch to sprocket setup, but I suppose one could install a torque converter on the motor. Any other questions feel free to ask and I will give you the best answer to my knowledge. I am also from lima Ohio if you would like to stop by and look it over you are more than welcome too.