O.S. 105HZ-R Helicopter Engine


1900 
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SPECIFICATIONS Displacement: 1.048 cu in (17.17 cc)
Bore: 1.142″ (29mm)
Stroke: 1.024″ (26mm)
RPM Range: 2,000 – 16.500
Output: 3.7 ps @ 15,000 RPM
Weight: 21.46oz (608g)
Crankshaft Size: UNF 5/16-24
Carburetor Settings;
High Speed Needle Valve: Approx. 2-1/2 turns open from fully closed
Medium Speed Needle valve: 1 turn open from fully closed
Idle Mixture Control Screw: At basic position when engine left
factory
Distance/Center of Mounting Holes Same Side: 0.98″ (25mm)
Distance/Center of Mounting Holes Opposite Side: 2.04″ (52mm)
Crankcase Width Below Mounting Tabs: 1.7″ (43mm)
Crankcase Width at Mounting Tabs: 2.4″ (61mm)
Width from Throttle Arm to Center: 1.6″ (42mm)
Height from Bottom of Mounting Tabs to Cylinder Head: 3.1″ (79mm)
Height/Bottom Mounting Tabs to Muffler Mounting Holes: 1.7″ (42.8mm)
Height/Bottom of Crankcase to top of Cylinder Head: 3.9″ (99mm)
Length from Backplate to Front Bearing: 3.2″ (82.6mm)
Length from End of Crankshaft to Center of Engine: 3.5″ (88.7mm)