YS Engine 56SR

This is the OS 55HZ Hyper Ringed Helicopter Engine with the 40L Carburetor
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)
Distance/top of cylinder head-bottom of mounting ears:
Distance between mounting holes same side: 0.68" (17.5mm)
Distance between mounting holes opposite side: 1.73" (44mm)
Distance between muffler mounting holes:
Length of cylinder head:
Width of cylinder head:
Distance/bottom of crankcase to top of cylinder head:
Distance from center of engine to front bearing:

****NOW AVAILABLE**** OS 91 HZ PS PUMP

HE90H02
ALIGN 91HP ENGINE

HE90H01
ALIGN 91H ENGINE

OS.91 SZ-H PH-HYPER RINGED HELI ENGINE WITH PUMP

OS .50 SX-H RINGED HYPER HELI ENGINE

YS HELI ENGINE; 50ST

YS HELI ENGINE: 91SR