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O.S. 21XZ-B VII Off-Road Competition Buggy Engine

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1.50 LBS

O.S. 21XZ-B VII Off-Road Competition Buggy Engine


This is the O.S. 21XZ-B V2 ABC Engine with 22B2 Carburetor for 1/8 scale Off-Road Buggy Racing.
****** 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: High performance crankshaft has silicone filled intake passage and
Tungsten counterweights
Lightening holes in cylinder head reduce overall weight
22B2 single needle slide valve carburetor
ABC piston and liner construction "A"luminum piston fitted to a
"B"rass cylinder liner that is "C"hrome plated
Optimized power band

INCLUDES: O.S. 21XZ-B V2 Off-Road Engine with 22B2 Carburetor, Exhaust
Gasket, P3 Turbo Ultra Hot Glow Plug, yellow 7mm Carb Reducer,
Instruction Manual and two Dust Caps

REQUIRES: Fuel: 10-30% nitro content, 20% recommended for break-in
Exhaust System: Depending on vehicle
Glow starter, fuel tubing and track equipment

SPECS: Displacement: 0.213 cu in (3.49 cc)
Bore: .641" (16.27mm)
Stroke: .661" (16.8mm)
Practical RPM: 3,000-41,500
Power Output: 2.7 PS @ 34,000 RPM
Weight: 12.77oz (362g)
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: 3.4" (86.5mm)
Width of Mounting Tabs: 1.8" (45mm)
Distance from Backplate to Front Bearing: 2.5" (64.5mm)
Distance from Center of Crankcase to Front Bearing: 1.7" (44mm)
Distance from Center of Crankcase to Backplate: 0.81" (20.5mm)

Carburetor Settings, NOTE carburetor is preset at factory and equires very small adjustments
Needle Valve: Gradually reduce factory needle valve setting in 15° increments following instructions in manual
Metering Needle: After setting at optimum position run vehicle in straight line and turn metering needle clockwise 15-30° to lean mixture, or 15-30° counter clockwise to richen mixture
Throttle Stop Screw: Turn counterclockwise if engine runs too fast with throttle closed



Wallie builds is the top option for any racer looking to have the best available car at the track. These kits are built to be winners and give you the best opportunity for wins and podiums.

- Wallie Builds will cover shipping charges to anyone in the US.

- Once the sale leaves beachRC and arrives at Wallie Builds we will take full responsibility for the order.

- Anything with the build will be handled by Wallie Builds.

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