OS Max OS Max 15630 55HZ-H Hyper Ringed .55 Helicopter Engine

This is the OS 55HZ Hyper Ringed Helicopter Engine with the 40L Carburetor.

FEATURES: Ideal for 3D flight-power equal to .60 size heli engines
Same mounting bolt pattern and silencer size as the OS 50SX-H Hyper
Dual needle 40L carburetor allows independent adjustment of idling,
hovering and high speed with four arm throttle lever for use with
a variety of servo brands
HZ Hyper low profile black aluminum six fin cylinder head
Two year limited warranty through manufacturer beginning at the date
of purchase

INCLUDES: OS 55HZ Hyper Ringed Helicopter Engine with 40L Carburetor, #8 glow
plug and instruction manual

REQUIRES: 10% to 30% nitro Fuel with at least 18% lubricant (Helicopter Mix)
Exhaust system such as the OS PowerBoost Pipe, OSMG2880
Starting equipment

SPECS: Displacement: 0.55 cu in (8.93cc)
Bore: 0.91″ (23mm)
Stroke: 0.85″ (23.5mm)
Practical RPM: 2,000-17,000 RPM
Weight: 14.39oz (408g)
Carburetor Settings:
High Speed Needle Valve, Two turns open from fully closed
Idle Mixture Control Screw, Factory set-do not adjust
Medium Speed Needle Valve, Two turns open from fully closed
Distance/top of cylinder head-bottom of mounting tabs: 2.8″ (72.6mm)
Distance between mounting holes same side: 0.68″ (17.5mm)
Distance between mounting holes opposite side: 1.73″ (44mm)
Distance between muffler mounting holes: 1.4″ (37mm)
Cylinder Head Diameter: 1.8″ (47mm)
Distance/bottom of crankcase to top of cylinder head: 3.6″ (90.9mm)
Distance from center of engine to front bearing: 2.03″ (51.6mm)
Distance from center of engine to end of Crankshaft: 3.2″ (82.6mm)
Distance from center of engine to backplate bolt: 0.98″ (25mm)
Distance from center of engine to throttle lever: 1.5″ (38mm)