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By certification 
Advantages:
YN27 hand hold internal-combustion rock drill is a hand-rock drilling tool which integrates the small gasoline-engine,compressor and rock drill.
It can blow off the rock powder in the blasthole by the compressing air generatedfrom itself.
Just 27kg weight for the main engine . Easy to carry about.Applicable for the areas of high mountains and of without power and wind pressure equipment,especially for those temporary projects with frequent movement.
Applications:
1. Applicable for rock drilling.Widely used in the earth and stone work of national defense,mining,road-construction,city construction and quarrying,etc.
2. Wide applicability. Regardless of the high mountains,flat grounds,the extremely hot area with the temperature of + 40℃ and bitter cold area of -40℃,it can work in good condition.
TECHNICAL SPECIFICATIONS
1.Weight of the main machine: 27kg
2.Overall dimension: 746×315× 229mm
3.Type of engine:single cylinder,air cooled two strokes
4.Cylinder Diameter×Stroke of piston:5 8 × 70mm
5. Rotating speed of engine: ≥2450r/min
6.Displacement of engine plston: 185cm3
7.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: 0.12 L/m
12.Tank capacity:≥ 1.14L
13. Mixing ratio of gasoline and lubrication oil (in volumes):8:1
14. End of drill rod dimensions: hexagonal2 2 × 108mm
15. Rotating speed of drill rod:≥200r/min
16. Clearance of Spark plug : 1.5mm
http://www.rockdrillatlas.com/
