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O.S. - OSMG2055 OSM12200 12200 531028022461 4531028022461
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O.S. 21XR-B (P)
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O.S. 21XR-B (P)
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Instruction Manuals: Manual 1 (4.7 MB)
Tower Catalog Page: 202

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Tech Notes
      This is the 21XR-B (P) 1/8 scale Buggy Engine from O.S. Engines.

**Not covered by the O.S. Two Year Warranty.**

FEATURES: Shares the same basic layout as the O.S. 21XZ-B and can be upgraded with 21XZ-B parts Ideal for up and coming 1/8 scale buggy racers and backyard bashers Blue anodized aluminum cylinder head 22(B) slide valve carburetor Natural finish crankcase

INCLUDES: 21XR-B ABC Buggy Engine with Slide Valve Carb, P3 Turbo Glow Plug, Exhaust Seal Ring, two Dust Caps, Instruction Manual

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: 2.45 PS, 2.61 HP/33,000RPM Practical RPM Range: 4,000 - 40,000 Bore: 0.641" (16.27mm) Stroke: 0.661" (16.8mm) Weight: 13.5oz (370g) 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 02/28/13 ir/jxs

– If you need more information, use these O.S. resources –
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Phone: 217-398-8970
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Accessories Needed
This is the O.S. 21XR-B ABC Off-Road Buggy Engine with 22B Carburetor. FEATURES: Easy to adjust 22B slide valve carb, upgradable with 21 XZ-B parts, turbo glow plug and instruction manual, blue anodized aluminum cylinder head REQUIRES: Fuel, air filter, exhaust system, track equipment

Accessories for the O.S. 21XR-B (P)

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

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