This engine has never been mounted or seen fuel.
It was purchased several years ago with the intention of building a suitable model but plans have changed so it is up for sale.

A review of the engine can be found at https://sceptreflight.com/Model Engine Tests/OS FS-200S.html

FEATURES:
Ideal for scale and sport aircraft
80N carburettor can be reversed 180 degrees for easy adjustment
Multi-directional F-6010 silencer for mild 4-stroke sound

INCLUDES:
O.S. Max 2.00 FS-200S Four Stroke Engine with type "F" glow plug, F-6010 muffler, header pipe, instruction manual.

REQUIRES:
Fuel: 5-30% nitro with at least 18% lubricant content
Propeller: 15x12-14, 16x12-14, 17x10-13, 18x6-10, 17x12-13, 18x8-12, 20x8 (break-in engine with prop intended for use on model)
Electric Starter: High torque
Glow starter and field equipment

SPECS:
Displacement: 1.98 cu in (32.4cc)
Bore: 1.50" (38.0mm)
Stroke: 1.13" (28.6mm)
Practical RPM: 1,800 - 10,000
Output: 2.9 ps /9000 RPM
Weight: 32.8oz (930g) without muffler 34.2oz (970g) with muffler
Crankshaft Thread Size: 5/16-24
Break-in Carburettor Settings;
Needle Valve: 3-4 turns open from fully closed
Idle Mixture: Slightly rich (45-60 degrees) from highest RPM setting
Mixture Control Valve: 3 turns in from counter clockwise
Distance Between Mounting Holes Same Side: 0.98" (25mm)
Distance Between Mounting Holes Opposite Side: 2.3" (58mm)
Height from Crankcase Bottom to Rocker Cover: 5.7" (144mm)
Height from Crankshaft centre to Rocker Cover: 4.7" (119mm)
Height from Crankshaft centre to Muffler centre: 3.2" (82mm)
Distance from Crankcase centre to Prop Hub: 0.27" (77mm)
Width at Mounting Tabs: 2.6" (67mm)
Width of Crankcase Below Mounting Tabs: 1.9" (48mm)
Width of Cylinder Head: 2.2" (58mm)
Distance from Carburettor to end of Crankshaft: 6.8" (172mm)
Distance from Carburettor to Crankcase centre: 2.3" (58.5mm)
Distan