180 Steeles Ave. West, Unit 29, Thornhill, ON (905) 482-8411 info@hobbyhome.ca View Cart (0)
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OS .21XZ-B ABC, 21J2 Carburator


This is the O.S. 21XZ-B ABC Engine with 21J2 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: Epoxy filled crankshaft
ABC piston and liner construction “A”luminum piston fitted to a
“B”rass cylinder liner that is “C”hrome plated
21J2 slide valve carburetor with 7mm carb reducer that restricts the
airflow helping to increase the amount of torque produced

INCLUDES: O.S. 21XZ-B ABC Off-Road Engine with 21J2 Carburetor, Exhaust Gasket,
P3 Turbo Ultra Hot Glow Plug, 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: 0.640″ (16.27 mm)
Stroke: 0.661″ (16.8mm)
Practical RPM: 4,000-40,000
Power Output: 2.55 PS, 2.51 HP/33,000 RPM
Weight: 12.52oz (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″ (86.3mm)
Width of Mounting Tabs: 1.8″ (45mm)
Distance from Backplate to Front Bearing: 2.5″ (64.5mm)
Distance from Center of Crankshaft to Front Bearing: 1.7″ (44mm)
Distance from Center of Crankshaft to Backplate: 0.81″ (20.5mm)

Carburetor Settings, NOTE carburetor is preset at factory and
requires very small adjustments
Needle Valve: Approximately 3.5 turns open from fully closed
Throttle: Approximately 0.5mm open from factory setting with
reducer removed
Metering Needle: Rotate until slotted head is 1.5mm away from ball
link body
Mixture Control Valve: Rotate until slotted head is flush with
carb body