OS Motors .55HZ-R DRS Ring 40L-R

This is the Restricted Edition OS 55HZ-R DRS Ringed Helicopter Engine
with the DRS (Demand Regulator System).

FEATURES:
DRS system delivers fuel to the regulator under consistent pressure
    for exact fuel delivery throughout the entire tank from full to
    empty
Installing position of DRS is perfectly in line with the carbohydrate for
    constant operation in all attitudes of flight
Exact same mounting bolt pattern as the OS 50SX-H Hyper
Double needle 40L-R carburetor enables independent modification of idling,
    hovering and high speed with four arm throttle lever for usage with
    a variety of servo brands
HZ Hyper low profile six fin cylinder head
2 year limited service warranty through Hobby Services beginning at the
    date of purchase

CONSISTS OF:
OS 55HZ-R DRS Ringed Helicopter Engine, #8 Glow Plug, Inspect Valve and
    User's manual

REQUIRES:
10% to 30% nitro Fuel with at least 18% lube (Helicopter Mix)
Fuel filter and beginning equipment

SPECIFICATIONS:
Engine;
Displacement: 0.55 cu in (8.93cc)
Bore: 0.91" (23mm)
Stroke: 0.85" (23.5mm)
Practical RPM: 2,000-20,000 RPM
Output: 2.1 PS, 2.07 HP
Weight: 15.1oz (429g)
Carburetor Settings:
    High Speed Needle Valve, Roughly 2 turns open from totally
closed position
    Idle Mix Control Screw, Factory set at center, turn ideal to
richen or left to lean mix
    Medium Speed Needle Valve, One turn open from totally closed, adjust
just after setting high speed needle and idle mix screw, do
not turn more than 90° right or left
Distance/top of cylinder head-bottom of mounting tabs: 2.8" (72.6mm)
Range between mounting holes same side: 0.68" (17.5mm)
Range between mounting holes opposite side: 1.73" (44mm)
Range between muffler mounting holes: 1.4" (37mm)
Cylinder Head Diameter: 1.8" (47mm)
Range/bottom of crankcase to top of cylinder head: 3.6" (90.9mm)
Range from center of engine to front bearing: 2.03" (51.6mm)
Range from center of engine to end of Crankshaft: 3.2" (82.6mm)
Range from center of engine to backplate bolt: 0.98" (25mm)
Distance from center of engine to throttle lever: 1.5" (38mm)