Just picked up two wisconsin engines over the weekend. One is an ACN the other one had no tag but looked like an AKN or AKS. I pulled the head off and it has a 2 7/8" bore and 2 3/4 stroke. Does that sound right for an AK? The spark plug comes out the side of the head like an AK. Also is there a way to identify the differance between the AKS and AKN. The tagless motor was missing the carb and magneto, but the ACN has both of those. The only other major thing I am missing is the air cleaner. If anyone has one they would like to sell please contact me. It sould be one that comes out at a 90 degree from the carb. Still looking for the motor pulley. If anyone out there has a ridemaster, could you get me some dimensions and closeup pics of the pulley. I may turn a new pulley. Were the reversing discs brass or fiber?