Rotary type carburetor (11J OSMG3817) with 6.5mm bore
Delivers 11% more power than a .15 size engine and has the same
O.S. Max .18 CV-RM Marine Engine with Pull-Starter, #8 Glow Plug
Carburetor, instruction manual
Fuel: O.S. suggests 10 to 30% nitro. However, they suggest starting
with 20% nitro and changing to a higher or lower nitro content
if required. Fuel should also contain 18% lubricant.
Displacement: 0.18 cu in (3.0cc)
Bore: 0.63" (16.0mm)
Stroke: 0.59" (15mm)
Practical RPM Range: 3000-32,000
Power Output: 1.35 PS, 1.33 HP/28,000 RPM
Weight: 8.21oz (232.6g)
Distance between mounting holes same side: 0.43" (11mm)
Distance between mounting holes opposite side: 1.2" (31.4mm)
Width of crankcase not including mounting flanges: 1" (25.6mm)
Width including mounting flanges: 1.5" (39mm)
Width including rear adapter (back plate): 1.6" (40mm)
Height bottom of crankcase to top of cylinder head: 2.6" (66mm)
Height bottom of mounting flanges/top of cylinder head: 2" (50.5mm)
Length from backplate to end of crankshaft: 2.7" (68mm)
Length from rear of recoil to end of crankshaft: 3.4" (87.8mm)
Length from cylinder centerline to front of drive washer: 1.6" (41mm)
Length form rear of recoil to front of drive washer: 2.9" (74.8mm)
Exhuast port mounting hole centers: 1.1" (27.5mm)
Distance from crankshaft centerline to top of head: 2" (50.5mm)
Distance/crankshaft centerline to exhaust centerline: 0.98" (25mm)
Crankshaft Threads: 5mmx0.8 pitch
O.S. does not recommend running this engine in any salt water
environment. Under such conditions, it is difficult to prevent
the engine from becoming corroded and eventually inoperable.
OS suggests using a 36-40mm diameter prop with 1.2-1.6 pitch.
NEEDLE SETTINGS: High Speed Needle: 2 turns OUT from closed position
per page 17 of manual.
Low Speed Needle (aka: Mixture Control Valve): Rotate the screw
until the head is flush with the carb body. Then turn the screw IN
exactly 1/2 turn per page 23 of manual.