summary ： advantages:needless to replace the internals of the engine head,just handle the handle to operate it. easy to operate.more time-saving and effortless.drilling faster and more efficient. have reached the tip-top level of the same field now,and allow to be replaced with the same kind of the domestic products. applications:available for drilling,splitting breaking, ramming, shovelling. and widely used in mining,road-construction, quarrying and national defense construction,etc. technical specifications 1.weight of the main machine: 27kg 2.overall dimension: 746ã—315㗠229mm 3.type of engine:single cylinder,air cooled two strokes 4.cylinder diameterã—stroke of piston:5 8 㗠70mm 5. rotating speed of engine: ≥2450r/min 6.displacement of engine plston: 185cm37.type of carburetor: hand needle valve,no floating type 8.ignition system: controllable silicon contactless system 9. drilling speed:(mean value of five holes) ≥ 250mm /min 10. max. drilling depth: ≥ 6m 11.fuel consumption: 0.122 /m 12.tank capacity:≥ 1.14l 13. mixing ratio of gasoline and lubrication oil (in volumes):12:1 14. end of drill rod dimensions: hexagonal2 2 㗠108mm 15. rotating speed of drill rod:≥200r/min 16. clearance of spark plug :0.5 -0.7mm