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1. Very efficient., 2. Less of the -easy-to -damage-part., 3. Very easy to control. - details see: https://www.machineto.com/yn27j-gosoline-rock-drill-10124925

The Internal Combustion Rock Drill Type YN27 J is a very efficient machine with the characters of the structure is very compact, less of the- easy-to-damage-parts, and very easy to control. It can adapt to these outside situations there is no water and electronic power. It is a kind hand held drill built up with gasoline engine, air pump, rock drill and the rotation plumbum equipment for running or stop. It can be used as a tool for breaking, percussive drilling, tamping besides rock drilling.

Technical specifications
Weight of main machine	27kg
Overall dimensions(L*W*H)	746*315*229mm
Type of engine	Single cylinder, air cooled two strokes
Cylinder diameter*stroke of piston	Φ58*70mm
Rotation speed of engine	≥2450rpm
Displacement of engine piston	185cm³
Type of carburetor	hand needle valve, floatless type
Ignition system	controllable silicon, contactless system
Drilling speed (mean value of five holes)	≥250mm/min
Drilling hole diameter	Φ28-42mm
Max drilling depth	6m
Fuel consumption	≤0.12L/m
Tank capacity	≥1.5liter
Mixture ratio of gasoline and lubrication oil (in volumes)	12:01
Drill rod and breaker shank	Hex22*108mm
Rotating speed of drill rod	≥200rounds/min
Clearance of spark plug	0.5-0.7mm