Murnan Modified Motors
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Keepoff 21-4 Rear Bearing
Latest News
  • RBM3X .12 Engine is avalilable
  • McGinty dominates RC Pit March Madness race.
  • RBM5X is now available!
  • RBM5X. 9901/41021 pipe 6mm insert.
  • Cole Ogden, and Ryan Lopez make the show at the Southern Nats
  • Murnan Modified Motors

    Welcome Guest! Would you like to log yourself in? Or would you prefer to create an account? Murnan Modified Motors has invested many years researching, and making 2 stroke glow engines perform beyond their expected limits for top level racers around the world.

    We have spent many years working with, and understanding how to make the finest racing engines in the world like Novarossi, RB Concept, Sirio, and too many more to list go faster. This is done through feedback from top level racers, as to what they need in an engine of engines! Each engine design also goes through stringent Dynamometer testing to make sure the new design is more powerful than the stock engine design. Then the track testing is done by our team to insure you get the fastest, most long lasting, most fuel efficient modified engine designs available in the world today. Each engine goes through an extensive modification process.  [read more]

    News and Information
    RBM3X .12 Engine is avalilable
    Murnan Modified RBM3x. The RBM3x has undergone extensive design changes, from the previous RBM3. The new design allows a new level of performance to be achieved. The 3 port design is race legal around the world.
    [Read More]
    McGinty dominates RC Pit March Madness race.
    John Michael McGinty TQ's and wins RC Pit March Madness race.
    [Read More]
    RBM5X is now available!
    .21 Off Road Powerhouse!
    [Read More]
    RBM5X. 9901/41021 pipe 6mm insert.
    [Read More]
    New Products

    Murnan Modified OS XZB-II
    Alpha Lutz World Engine
    Alpha Lutz World Engine
    Murnan Modified Alpha Lutz World Engine
    Murnan Modified Alpha Lutz World Engine

    Novarossi 41031 Conical Manifold

    Keepoff 21-4 Rear Bearing
    Novarossi REX R21 Plus5
    Novarossi REX R21 Plus5
    You can send new engines to the following address for modification.
    Murnan Modified Motors
    1679 Elmwood Drive
    Austell, GA 30106

    The price is $150 per engine.
    We accept Credit Cards, Paypal, Money Orders.
    Please send Paypal payments to
    Please allow 2-3 weeks for return of modified engine, unless other arrangements are made.

    Murnan Modified Motors: Each engine is modified using extremely precise machinery, and then finished by hand. Balancing the crankshaft is essential for a long lasting smooth running high revving engine that sings that special note at the end of a long back straight. After the crankshaft is lightened, modified, and balanced the surfaces are finished, and a silicone fuel ramp is added to each crankshaft if necessary. This hand finishing insures the highest quality engines are produced. Cylinder port timings are modified when necessary. There are too many other modifications done to each engine to list here. These modifications give Murnan Modified engines unmatched acceleration, top speed, and ease of use.

    Each modified engine is assembled by hand with the most use of care, and inspection. This is why Murnan Modified engines have the reputation of being the best in the world. This is why top drivers from around the world choose to race with Murnan power!!!

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    Designated trademarks and brands are the property of their respective owners.