O.S. 21TM ABC w/Revo Manifold

Tower Stock# LXRTM2  •  Manufacturer Stock# 12241
O.S. 21TM ABC w/Revo Manifold (large view)
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Notes from our tech department:
This is the O.S. Max 21TM Engine with the Revo Manifold.
Direct fit for the 2.5 and 3.3 Traxxas Revo.

*** Two year limited warranty ***

FEATURES

Adapts perfectly to the Traxxas E-Z Start or pull-start systems with
no modifications
Included manifold is specially designed to fit directly onto the
Revo
Traxxas' clutch assembly bolts right to the crankshaft with no
modifications
Oversized cooling fins on crankcase helps to keep engine cooler
Three needle slide valve carburetor with fins to help cool the fuel
as it enters the engine
High-performance long reach O.S. LC3 glow plug suitable for off-road
applications that require constantly varying speed

INCLUDES

One O.S. Max 21TM Engine with Revo Manifold, LC3 glow plug, 11K
slide valve carburetor, manifold spring, rubber exhaust gasket,
sticker sheet and instruction manual

REQUIREMENTS

Installing in vehicle
Air filter

SPECIFICATIONS

Displacement: 0.21 cu in (3.4cc)
Bore: 0.669" (17mm)
Stroke: 0.590" (15mm)
Practical RPM: 3,000 - 35,000 RPM
Output: 1.8 PS, 1.77 HP/29,000 RPM
Weight: 8.57oz (243g)

Distance between mounting hole centers same side: 0.43" (11mm)
Distance between mounting hole centers opposite side: 1.2" (31.4mm)
Distance from end of crankshaft to drive washer: 1.03" (26.3mm)
Distance from center of engine to front bearing: 1.4" (34.8mm)
Distance/bottom of mounting flanges/top of cylinder head:3.2"(81.2mm)
Width of mounting flanges: 1.5" (39mm)
Length of exhaust flange: 0.24" (6mm)
Height/backplate mount to top of cylinder head: 3.3" (85.3mm)

COMMENTS

Needle Settings:
- High Speed Needle (Needle Valve) 2-1/2 turns out from close.
To break-in close approximately 30 after running one tank
of fuel through vehicle, repeat five times
- Mid Range Needle (Mixture Control Valve) Screw head is exactly
1/2 turn in from flush with the carb body
- Low Speed Needle (Metering Needle) Turn 30 clockwise to lean
mixture or counter-clockwise to richen mixture

jxs 8/31/07
ir/jxs

Resources
See Tower Catalog page 172.
Parts Compatibility
Easy RC: Engines
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