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O.S. - OSMG2052 OSM12175 12175 531028022669 4531028022669
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O.S. 21XZ-B ABC Speed Spec II
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O.S. 21XZ-B ABC Speed Spec II
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Tower Catalog Page: 202

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Late Apr

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Tech Notes
   This is the Speed Tuned 21XZ-B Speed Spec II ABC 1/8 scale Buggy Engine
                               from O.S. Engines.
      ******Because of the expressed racing nature of this engine,******
           ******it is NOT covered by the O.S. 2 Year Warranty******
                      ******per page 1 of manual.******

FEATURES: DLC coated crankshaft with silicone filled intake passage for improved fuel flow ABC piston and liner construction "A"luminum piston fitted to a "B"rass cylinder liner that is "C"hrome plated 21J2(B) slide valve carburetor with three carb reducers that restrict airflow helping to increase the amount of torque produced Black anodized crankcase Ceramic rear ball bearing

INCLUDES: 21XZ-B ABC Buggy Engine with Slide Valve Carb, P3 Turbo Glow Plug, Exhaust Seal Ring, two Dust Caps, Instruction Manual and 6mm, 6.5mm and 7mm Carb Reducers

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: .213 cu in (3.49cc) Output: 2.65 PS, 2.61 HP/34,000RPM Practical RPM Range: 4,000 - 42,000 Bore: 0.641" (16.27mm) Stroke: 0.661" (16.8mm) Weight: 12.52oz (355g) Crankshaft Size: UNF1/4-28 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 at Mounting Tabs: 1.8" (45mm) Width of Crankcase below Mounting Tabs: 1.2" (31.6mm) 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 02/25/13 ir/jxs

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Accessories Needed
This is the O.S. 21XZ-B ABC Off-Road Buggy Engine with 21J2(B) Carburetor. FEATURES: Tungsten weighted silicone filled crankshaft, slide valve carb w/6mm reducers, P3 turbo ultra hot glow plug and instruction manual, black anodized crankcase w/ceramic rear ball bearing REQUIRES: Fuel, air filter, exhaust system, track equipment

Accessories for the O.S. 21XZ-B ABC Speed Spec II

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 LXRXC9 Tower Hobbies TOWER Power 20% Car Fuel Quart
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7.69   In Stock
Subtotal for this Group of Accessories: 7.69  

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