O.S. .21XZ-R VII On-Road 13875
This is the O.S. 21XZ-R Version II
ABC Engine with 21M Carburetor for 1/8 scale On-Road Vehicles.
****** Because of the expressed
racing nature of this engine, ******
****** it is NOT covered by the
O.S. 2 Year Warranty ******
****** per page 8 of manual.
******
Features
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O.S. .21XZ-R VII On-Road 13875
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Tungsten-weighted silicone
filled crankshaft creates optimum balance for consistent low and mid speed
torque
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ABC piston and liner
construction "A"luminum piston fitted to a
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"B"rass cylinder liner that is
"C"hrome plated
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Liner has seven scavenger
ports and three exhaust ports for more efficient combustion
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21M slide valve carburetor
with 9mm carb reducer that restricts the airflow helping to increase the
amount of torque produced
Specifications
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Displacement: 0.213 cu in
(3.49 cc)
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Bore: 0.640" (16.27 mm)
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Stroke: 0.661" (16.8mm)
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Practical RPM: 4,000-45,000
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Power Output: 2.7 hp @ 33,000
RPM
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Weight: 12.06oz (343g)
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Distance Between Mounting
Holes Same Side: 0.83" (21mm)
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Distance Between Mounting
Holes Opposite Side: 1.45" (37mm)
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Height Bottom of Mounting
Tabs/Top of Cylinder Head: 3.45" (87.7mm)
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Width of Mounting Tabs: 1.8"
(45mm)
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Distance from Backplate to
Front Bearing: 2.6" (65.6mm)
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Distance from Center of
Crankshaft to Front Bearing: 1.7" (44mm)
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Distance from Center of
Crankshaft to Backplate: 0.85" (21.6mm)
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Carburetor Settings,
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Needle Valve:
Approximately 3 turns open from fully closed
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Throttle: Approximately
0.5mm open from factory setting with reducer removed
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Metering Needle: Rotate
until slotted head is 0.5mm away from ball link body
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Mixture Control Valve:
Rotate until slotted head is flush with carb body
Contents
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O.S. 21XZ-R Version II ABC
On-Road Engine w/21M Carburetor, Exhaust
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Gasket RP7 Turbo Glow Plug,
9mm Carb Reducer, Flywheel Collet,
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Instruction Manual, 0.2mm Head
Gasket and two Dust Caps
Requirements
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Fuel: 10-30% nitro content,
20% recommended for break-in
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Exhaust System: Depending on
vehicle
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Glow starter, fuel tubing and
track equipment
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