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OS .21 RG

The .21 RG - sport engine with winning power.

  • Entire engine dissipates heat more quickly.
  • Needle valve adjusts with a screwdriver-no need to pry up or remove the body.
  • Needle is set in a strong brass sleeve for durability and reduced air leakage.
  • Redesigned fuel inlet resists breakage
  • Slide Valve throttle setup features ball link to resist turning, while allowing more precise adjustments.
  • All include 201 air cleaner; non-pull-start versions also include exhaust adapter
  • Also available with the easy operating convenience of a recoil starter .

More RG performance features:

  • Insulating thermal plastic ring on carb mounting helps to hold settings and simplify tuning.
  • Large flow-thru bar stock aluminum cooling head is standard.
  • Bearings have rubber seal and larger balls for durability.
  • Cylinder features hard chrome-plated brass sleeve (ABC).
  • Carburetor stop prevents the rotor from sliding too far.
  • Mounting hole pattern matches RX Series engines for easy upgrades.
Displacement 0.211 (3.46 cc)
Bore 0.654 in (16.6 mm)
Stroke 0.630 in (16.0 mm)
RPM 3000 - 35000


1.9 BHP @ 30000 RPM
Weight 11.47 oz (325 g)
Price R Not Available

Also available with recoil starter