This engine is an original Yamaha and has spare part number 4DL007153. After careful checks and inspections, our technicians have found the following conditions: good condition - no breakages - unused for a long time, coming from an accidented motorcycle - cylinder and piston ok with no signs of seizure - head ok - exhaust valve ok - moving the piston by hand you can feel a little play on the piston pin and the shaft bearings have a little wear - without: side covers, clutch, flywheel, stator, starter motor, reed valve pack. This engine is compatible with the following Yamaha models: TZR 125 RR /