GZ4000s Strato-Charged engine meets 2005and CARB standards by introducing fresh air into engine between exhaust gases and air/fuel mix, thereby reducing exhaust emissions without a catalytic converter and the hot gases it would generate. Fuel-efficient 40.1-cc., 2.45-hp. engine boasts maximum speed of 13,000 r.p.m. for heaviest pruning. Dust-free system prevents sawdust and debris from clogging engine intake and causing overheating. Comes with 14-, 16-, or 18-in. bar. Weighs just 9.67 lbs. for comfortable operation in any position.