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OS Engines 21TM ABC .21 Engine with Manifold: 2.5 and 3.3 Revo

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    A performance boost for one of R/C's most popular trucks!

    Boost the 4WD performance power in your Traxxas® Revo® with the 21TM engine from O.S.! It's the perfect upgrade for your monster masher — because it's a direct fit for Traxxas EZ-Start® or pull-start systems, as is the manifold and clutch assembly!
    O.S. Two Year Limited Warranty
    • The 21TM adds more power and displacement than the 18TM – and without modification!
    • Retrofits into the same mounting pattern, and the Traxxas clutch assembly bolts right on.
    • The special manifolds adapt perfectly to existing pull-start or EZ-Start® systems.
    • Reliable, lightweight and easy to operate – and both include a 3-needle carb for more precise tuning and an LC3 glow plug.

    Product Specs

    Bore
    0.669 in (17 mm)
    Crankshaft Threads
    M7x1
    Crankshaft Type
    Threaded
    Cylinders
    Single
    Displacement
    0.211 cu in (3.46 cc)
    Engine (Only) Weight
    12.25 oz (347 g)
    Oil Type & Content
    At least 18% synthetic lubricant
    Plug Type
    LC3
    Power Type
    Glow
    Product Height
    3.3" (85.3mm) crankcase botton to top of cylinder head
    Product Length
    2.1" (53.6mm) from back plate to front bearing
    Product Width
    1.5" (39mm) at mounting tabs
    RPM Range
    3,000 - 35,000 rpm
    Stroke
    0.590 in (15 mm)
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