Knapsack Power Sprayer 139F Engine,four stroke High pressure and power Model: TM-809A Chemical Tank:23L Engine Model139FEngine Type4 Stroke, over head valve,1cylinderDisplacement31cm2Bare*Stroke39*26MMIgnitionTransistor magnetoMax.rotation with no load10,000rpmMax. Output0.7kw/6500r/minFuel Consumption480g*kw.hCooling systemForce airPlunger Dia18mmNetWeight13KGSDimension465*405*615mm