Mcculloch MC91m/c go kart mini bike engine, (100cc). This is  a running engine.  This is not a new engine, there may be broken or bent cooling fins , or other minor repairs, no damaged threads on this engine,  cylinder is freshly honed for +.005 piston clearance, +.005 piston is very good condition, new rings installed, cylinder ports have been modified, new seals, new gasket seals, new bolts/washers, carb is complete has new parts.Motor has high compression. Carb and manifold will be removed from engine for safer shipping , instructions for reassembly, starting and running included.  Ships to your Ebay shipping address. sold as is for parts or restoration. packing is free shipping is 30.00