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  • OS Engines R21 1/8 On-Road Club Racer Engine
  • OS Engines R21 1/8 On-Road Club Racer Engine
  • OS Engines R21 1/8 On-Road Club Racer Engine
  • OS Engines R21 1/8 On-Road Club Racer Engine
  • OS Engines R21 1/8 On-Road Club Racer Engine
  • OS Engines R21 1/8 On-Road Club Racer Engine

OS Engines R21 1/8 On-Road Club Racer Engine

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  • Detail

    Premium power, entry-level ease.

    Club racers rejoice! The R21 engine delivers an unbeatable blend of power and value for 1/8 on-road racing. Its crankshaft and piston/liner are designed with premium performance and easy maintenance in mind, which makes it an ideal choice for beginners. Best of all, they can be upgraded with O.S. Speed parts when you want to step up to Spec-class competition. High performance. Low price. That’s what you can expect from the R21, only from O.S.
    • The perfect power plant for rookies and club racers!
    • Upgradable, newly developed crankshaft and piston/liner lets you transform the R21 into a Spec-class performer.
    • RP7 Turbo glow plug.
    • 8.5 mm carb reducer.
    • Speed flywheel collet.
    • Exhaust seal ring.
    • Dust cap set.

    Product Specs

    Bore
    0.64 in (16.3 mm)
    Crankshaft Threads
    UNF1/4-28
    Cylinders
    Single
    Displacement
    0.213 cu in (3.49 cc)
    Plug Type
    Turbo RP7 glow plug
    Power Type
    Glow
    Product Height
    3.6 in (91.2mm) from backplate to front bearing
    Product Length
    2.5" (64.5 mm)
    Product Width
    1.8 in (45 mm) at mounting tabs
    RPM Range
    4,000 - 44,000 rpm
    Stroke
    0.67 in (17.2 mm)
    Total Weight
    12.35 oz (350 g)
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