3. Operation Manual For 1.7HP MANTRA Pro 43CC Gas Pole Pruner Saw Chainsaw —< Product Parameter Pole Chain Saw Model: SY-PP8340 Engine Mode: 1E40F-5A Engine Power: Engine Type: Air-cooled, two-stroke, single cylinder gasoline Engine Displacement: 43cc Carburetor Type: Pump-film type Idle Speed: Fuel Tank Capacity: 1000ml Oil Mixing Ratio: 20-251 Starter System: Hand-starter 1. Idling Screw Length: 240cm-340cm 2. Choke Valve Guide Bar Size: 2 3.