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

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

FUNCTIONS:
DRS system delivers fuel to the regulator under continuous pressure
    for accurate fuel shipment throughout the entire tank from complete to
    empty
Installing position of DRS is perfectly in line with the carbohydrate for
    constant operation in all attitudes of flight
Same mounting bolt pattern as the OS 50SX-H Hyper
Dual needle 40L-R carburetor enables independent adjustment of idling,
    hovering and high speed with 4 arm throttle lever for usage with
    a variety of servo brand names
HZ Hyper low profile 6 fin cylinder head
2 year restricted guarantee through Pastime Solutions beginning at the
    date of purchase

CONSISTS OF:
OS 55HZ-R DRS Ringed Helicopter Engine, #8 Glow Plug, Check Valve and
    Instruction Manual

NEEDS:
10% to 30% nitro Fuel with a minimum of 18% lube (Helicopter Mix)
Fuel filter and starting 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, Approximately two turns open from completely
closed position
    Idle Mixture Control Screw, Factory set at center, turn right to
richen or delegated lean mix
    Medium Speed Needle Valve, One turn open from completely closed, adjust
only 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 exact 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)