O.S. .21XZ-R VII On-Road 13875

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

• O.S. .21XZ-R VII On-Road 13875

• Tungsten-weighted silicone filled crankshaft creates optimum balance for consistent low and mid speed torque

• ABC piston and liner construction "A"luminum piston fitted to a

• "B"rass cylinder liner that is "C"hrome plated

• Liner has seven scavenger ports and three exhaust ports for more efficient combustion

• 21M slide valve carburetor with 9mm carb reducer that restricts the airflow helping to increase the amount of torque produced

Specifications

• Displacement: 0.213 cu in (3.49 cc)

• Bore: 0.640" (16.27 mm)

• Stroke: 0.661" (16.8mm)

• Practical RPM: 4,000-45,000

• Power Output: 2.7 hp @ 33,000 RPM

• Weight: 12.06oz (343g)

• Distance Between Mounting Holes Same Side: 0.83" (21mm)

• Distance Between Mounting Holes Opposite Side: 1.45" (37mm)

• Height Bottom of Mounting Tabs/Top of Cylinder Head: 3.45" (87.7mm)

• Width of Mounting Tabs: 1.8" (45mm)

• Distance from Backplate to Front Bearing: 2.6" (65.6mm)

• Distance from Center of Crankshaft to Front Bearing: 1.7" (44mm)

• Distance from Center of Crankshaft to Backplate: 0.85" (21.6mm)

• Carburetor Settings,

•   Needle Valve: Approximately 3 turns open from fully closed

•   Throttle: Approximately 0.5mm open from factory setting with reducer removed

•   Metering Needle: Rotate until slotted head is 0.5mm away from ball link body

•   Mixture Control Valve: Rotate until slotted head is flush with carb body

Contents

• O.S. 21XZ-R Version II ABC On-Road Engine w/21M Carburetor, Exhaust

• Gasket RP7 Turbo Glow Plug, 9mm Carb Reducer, Flywheel Collet,

• Instruction Manual, 0.2mm Head Gasket and two Dust Caps

Requirements

• Fuel: 10-30% nitro content, 20% recommended for break-in

• Exhaust System: Depending on vehicle

• Glow starter, fuel tubing and track equipment