21.7cc 2 cycle engine, the carburetor has a diaphragm with purge pump, solid state ignition system, the fuel capacity is 16.9 fl. oz, and the TR2300S only weights 9.5 lbs. The riveshaft is straight, solid steel, with splined ends, the head is the PT104+. The warranty is 2 years commercial, 2 years homeowner, and 90 days rental.