O.S. .21XZ-M 3.5cc Inboard Marine 13951
This is the O.S. 21XZ-M 3.5cc Inboard Marine Engine.
****** Because of the competition nature of this engine,******
******it is NOT covered by the O.S. 2 Year Warranty.******
Features
O.S. .21XZ-M 3.5cc Inboard Marine 13951
Designed expressly for 21 class boat racing
21D big bore carburetor allows use of high nitro fuel
Blue anodized water cooled head
Specifications
Displacement: .21 cu in (3.5cc)
Bore: 0.640" (16.27mm)
Stroke: 0.661" (16.8mm)
Practical RPM: 4,000 - 45,000
Power Output: 2.75 hp (33,000RPM)
Crankshaft Size: 1/4-28
Carburetor Settings:
Needle Valve; 1.5 turns from fully closed
Mixture Control Valve: Turn clockwise 10� to lean mixture or counterclockwise to richen mixture, adjust in steps of no more than 45-90�
Distance between mounting hole centers same side: 0.83" (21mm)
Distance between mounting hole centers opposite side: 1.4" (37mm)
Distance/mounting tab to center of exhaust: 1.1" (28.5mm)
Distance/mounting tab to center of cooling inlet: 2.2" (55.6mm)
Distance from exhaust center to mounting flange bottom: 1.1" (28.5mm)
Width not including mounting flanges: 1.2" (31.6mm)
Width including mounting flanges: 1.8" (45mm)
Height bottom of crankcase to top of intake:
Height bottom of mounting flanges to top of intake: 2.6" (66.1mm)
Length from backplate to end of crankshaft: 3.4" (86.5mm)
Length from backplate to front bearing: 2.5" (64.5mm)
Length from crankcase center to front bearing: 1.7" (44mm)
Contents
O.S. 21XZ-M 3.5cc Marine Engine with 0.2mm Head Gasket, Silicone Exhaust Seal, RP7 Turbo Glow Plug, two Dust Caps and Instructions
Requirements
Glow Fuel: Boat blend with 10-30% nitromethane content, use 20% for break-in
Exhaust system depending on boat
Glow plug igniter
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