FX K303 Tuned Black Edition .21 Nitro Engine Combo – 650009

The FX K303 Tuned Black Edition is a high-performance 3.5cc (.21) competition nitro engine developed for 1/8 scale off-road racing. Designed and manufactured in Europe by FX Engines, the K303 is aimed at serious buggy racers looking for strong performance, smooth power delivery and excellent efficiency.

FX 650009 is the complete K303 Tuned Combo, supplied with the engine, FX EFRA 2169 exhaust and Medium manifold, providing a matched race-ready engine and exhaust package.

K303 Tuned Competition Engine

The K303 is FX's high-performance 3-port off-road racing engine.

The Tuned version receives additional factory preparation to maximise performance and consistency. It's designed to provide a strong combination of bottom-end response, usable mid-range torque and high-RPM performance, making it particularly well suited to modern 1/8 nitro buggy racing.

3-Port Design

The K303 uses a 3-port engine configuration, designed to provide smooth and controllable power delivery.

Rather than simply chasing maximum RPM, the engine is intended to deliver usable power across the rev range – particularly important on loose or low-grip off-road tracks where throttle control can be just as important as outright horsepower.

DLC-Coated Crankshaft

The K303 Tuned features a DLC-coated crankshaft.

DLC – Diamond-Like Carbon – provides an extremely hard, low-friction surface treatment. In a high-performance nitro engine, this helps reduce friction and wear while providing excellent durability under demanding racing conditions.

Factory Balanced

The rotating assembly is factory balanced, helping the engine operate smoothly at the extremely high RPM associated with competition nitro racing.

Careful balancing helps reduce unwanted vibration and contributes to smooth power delivery and engine consistency.

Ceramic Rear Bearing

The K303 specification incorporates a ceramic rear bearing, reducing rotating friction compared with a conventional all-steel bearing and helping the engine achieve smooth, efficient high-RPM operation.

FX EFRA 2169 Exhaust Included

The 650009 Combo includes FX's 3.5cc EFRA 2169 off-road exhaust system.

The 2169 pipe is specifically intended for 1/8 off-road use and is matched to the characteristics of FX's competition engines.

Medium Manifold Included

Also supplied is the matching FX Medium off-road manifold.

Using the engine with its matched pipe and manifold takes the guesswork out of selecting an exhaust combination and provides a complete package for a new competition buggy build.

FX's current parts listing confirms 650009 as the K303 Tuned engine + 2169 muffler + Medium manifold combo.

Designed for 1/8 Nitro Buggy Racing

The K303 is designed specifically for serious 1/8 scale nitro off-road competition.

It's an ideal engine package for high-end racing buggies from manufacturers such as XRAY, Mugen Seiki, Kyosho, Team Associated, SWorkz and HB Racing.

The emphasis is on controllable race power, efficiency, consistency and reliability rather than simply producing the highest possible peak RPM.

Key Features

• FX Engines K303 Tuned Black Edition
• Part Number: 650009
• Competition 3.5cc / .21 nitro engine
• Designed for 1/8 scale off-road racing
• 3-port engine design
• Tuned competition specification
• DLC-coated crankshaft
• Factory-balanced rotating assembly
• Ceramic rear bearing
• High-performance off-road power delivery
• Smooth and controllable throttle response
• Designed and manufactured in Europe
• FX EFRA 2169 exhaust included
• FX Medium manifold included
• Complete matched engine and exhaust combo
• Suitable for competition 1/8 nitro buggies
• Barcode: 8581706500091

Specifications

Brand: FX Engines
Part Number: 650009
Model: K303 Tuned Black Edition
Engine Type: Nitro / Glow
Displacement: 3.5cc / .21 Class
Application: 1/8 Off-Road Competition
Ports: 3
Crankshaft: DLC Coated
Rear Bearing: Ceramic
Exhaust: FX EFRA 2169
Manifold: FX Medium Off-Road
Barcode: 8581706500091
Completion: Engine / Pipe / Manifold Combo

What's Included

• FX K303 Tuned Black Edition .21 Nitro Engine
• FX EFRA 2169 Off-Road Muffler
• FX Medium Off-Road Manifold

This is the complete 650009 combo, rather than the engine-only version.

Built for Serious Nitro Racing

The FX K303 Tuned Black Edition is aimed squarely at competitive 1/8 buggy racers.

Its combination of a 3-port design, DLC crankshaft, ceramic bearing, factory tuning and balancing provides the performance and refinement expected from a premium race engine, while the included EFRA 2169 pipe and Medium manifold provide a matched exhaust package straight from the box.

FX Engines are designed, developed and manufactured in Europe and are part of the HUDY family of competition RC brands, with the company established specifically to develop high-end racing engines.