FX K303 TUNED - 3 PORTS, DLC, BALANCED .21 NITRO BUGGY/TRUGGY ENGINE

 

FX K303 TUNED - 3 PORTS, DLC, BALANCED .21 NITRO BUGGY/TRUGGY ENGINE

Built for Precision.
Tuned to Win.

The FX K303 Tuned is a high-performance .21 competition engine designed for 1/8 buggy and truggy racing. It delivers strong power from low-end torque all the way to high RPM, while remaining highly controllable and easy to handle. This allows for precise power delivery and maximum control on a wide variety of track conditions.

Featuring a 3-port sleeve, a DLC-coated tungsten-balanced crankshaft, and a precision-lapped piston and sleeve set, the engine ensures sharp throttle response, maximum efficiency under racing conditions, and consistent, race-winning performance.

A multiple European Championship winner, the FX K303 Tuned has proven itself on the world’s most demanding tracks.

Optimized Flow.
Maximum Power.

The black-coated crankcase is engineered for optimized fuel flow, delivering strong power from low-end torque all the way to high RPM.

Refined internal passages reduce turbulence and ensure consistent fuel delivery for precise throttle control and stable performance on medium to high traction tracks.

The updated rear bearing improves durability and long-term reliability under demanding racing conditions.

Result: improved performance and better throttle control.

 

Instant Throttle Response.
Precise Fuel Control.

The K303 Tuned black-coated carburetor features a short needle and optimized venturi for precise fuel metering and stable tuning.

The result is instant throttle response and clean, predictable power delivery.

Strong midrange power and smooth transitions ensure excellent drivability on medium-to-high traction tracks.

Result: faster response, smoother control, and more confidence on throttle.

 

Reduced Friction.
Maximum Power Transfer.

The K303 Tuned crankshaft features a friction-reducing DLC coating and dual tungsten balancing for superior rotational stability.

The DLC coating minimizes friction and ensures smoother operation of the connecting rod, improves internal flow, and increases the lifespan of the conrod and bearings.

At high RPM, the optimized balance delivers stable engine operation and consistent performance under demanding racing conditions.

Result: maximum power transfer, reduced wear, and long-lasting & reliable performance at any RPM.

 

Precision Fit.
Maximum Efficiency.

Each piston and sleeve pair is individually hand-lapped for perfect sealing, faster break-in, and consistent performance.

The optimized 3-port sleeve design delivers strong low-end torque and aggressive midrange acceleration.

The result is smooth, predictable power delivery and reliable performance under racing conditions.

Result: faster break-in, longer performance stability, and consistent power run after run.

 

Maximum Strength.
Reliable Power Transfer.

The K303 connecting rod is engineered to withstand extreme loads and high RPM, ensuring reliable operation under the most demanding race conditions.

Manufactured using advanced FX technology and premium materials, it delivers maximum strength, precision, and long-term durability.

The optimized design ensures efficient power transfer and consistent engine performance throughout the run.

Result: reliable performance, stable power delivery, and confidence at high RPM.

 

Engineered in Europe.
Built to Win.

Each engine is individually hand-finished to deliver consistent performance from break-in through the most demanding race conditions.

Built for reliability. Proven on the track.