Yamaha KT100S engine.  We have not run this engine ourselves but it is in good appearing condition, including the piston, cylinder liner and connecting rod bearing.  Cylinder bore measures approximately 52.04mm using a dial caliper.  

The spark plug wire shows wear that was covered with electrical tape (see photo), but the ignition produces good spark when tested on the bench.  The cylinder head spark plug threads have an insert replacement and are in good working condition (see photo). 

Ships as shown:  Engine long block, ignition system, intake spacer and carburetor mount.  

Does not include carbruetor, spark plug, exhaust or clutch.