September 2016 Service and Repair ManualSpecificationsPart No. 1274592 Z-34/22 IC 7Kubota WG-972 EngineDisplacement 57.8 cu in0.96 litersNumber of cylinders 3Bore and Stroke 2.93 x 2.90 inches74.5 x 73.6 mmHorsepower 32.5 @ 3600 rpm24.2 kW @ 3600 rpmFiring order 1 - 2 - 3Low idle 1600 rpm229.7 HzHigh idle 3000 rpm441.7 HzCompression ratio 9.2:1Compression pressure 130 to 185 psi8.96 to 12.76 barGovernor centrifugal mechanicalValve Clearance, cold 0.0057 to 0.0072 in0.145 to 0.183 mmLubrication systemOil pressure 29 to 64 psi2.0 to 4.4 barOil capacity(including filter)3.6 quarts3.4 litersOil viscosity requirementsBelow 86°F / 30°C 5W-20-4°F to 104°F / -20°C to 40°C 10W-30Above 14°F / -10°C 15W-40Unit ships with 15W-40. Extreme operatingtemperatures may require the use of alternative engineoils. For oil requirements, refer to the Engine OperatorManual for your engine.Fuel PumpFuel pressure, static 4.26 psi0.29 barFuel flow rate 0.11 gpm0.40 L/minFuel requirementFor fuel requirements, refer to the engine OperatorManual for your engine.Alternator output 40A @ 12V DCFan belt deflection 1/4 to 3/8 in7 to 9 mmStarter motorBrush length, new 0.551 in14 mmBrush length, minimum 0.437 in11.1 mmBatteryType 12V DCGroup 34/78Quantity 1Ampere hour 75AHCold cranking ampere 900AReserve capacity @ 25A rate 125 minutesEngine coolantCapacity 1.3 quarts1.22 litersIgnition systemIgnition spark advance 21° BTDCIgnition coil primary resistance 1.87 to 2.53 Ω@ 68°F / 20°CIgnition coil secondaryresistance10.4 to 15.6 kΩ@ 68°F / 20°C#1 Spark plug wire resistance 2.81 to 4.79 kΩ#2 Spark plug wire resistance 3.4 to 5.8 kΩ#3 Spark plug wire resistance 3.57 to 6.09 kΩSpark plug type NGK BKR4E-11Spark plug gap 0.024 to 0.027 in0.6 to 0.7 mm