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O.S. - OSMG2050 OSM12180 12180 531028020917 4531028020917
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O.S. 21XZ-B ABC w/21J2 Carb
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O.S. 21XZ-B ABC w/21J2 Carb
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On-line Videos: Video 1 (13.2 MB) Video 2 (YOUTUBE)
Instruction Manuals: Manual 1 (2.7 MB)

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Possible Substitutions

Tech Notes
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. ******


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


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


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


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

jxs 11/01/10

– If you need more information, use these O.S. resources –
Email: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970
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Accessories Needed
This is the O.S. 21XZ-B ABC Off-Road Buggy Engine with 21J2 Carburetor. FEATURES: Epoxy filled crankshaft, slide valve carb with 7mm reducer for higher torque, P3 turbo ultra hot glow plug and instruction manual REQUIRES: Fuel, air filter, exhaust system, track equipment

Accessories for the O.S. 21XZ-B ABC w/21J2 Carb

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 LXRXC9 Tower Hobbies TOWER Power 20% Car Fuel Quart
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9.99   In Stock
Subtotal for this Group of Accessories: 9.99  

Primary Accessories   Building & Field Equipment Optional Accessories

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