This is the O.S. Max .18CV-RMX Marine Engine with Pull-Start.
** Two Year Limited Warranty **
Ideal upgrade from .15 cu in (2.4cc) engines used in
Ready-To-Run boat models.
FEATURES: Recoil Starter
Rotary type carburetor (11J OSMG3817) with 6.5mm bore
Delivers 11% more power than a .15 size engine and has the same
INCLUDES: O.S. Max .18 CV-RM Marine Engine with Pull-Starter, #8 Glow Plug
Carburetor, instruction manual
REQUIRES: 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.
SPECS: 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
COMMENTS: 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.