KTM 350 SX-F (2011-2015): Bridging the Gap Between Power and Precision

Introduction

When KTM introduced the 350 SX-F in 2011, it wasn’t just launching another motocross bike—it was challenging the status quo. Positioned between the 250cc and 450cc classes, this machine promised the agility of a lighter bike with the grunt of a bigger engine. Fast-forward to today, and the 2011-2015 generation of the KTM 350 SX-F remains a fascinating study in balance. After spending time aboard this Austrian-engineered weapon, it’s clear why it still turns heads in the used market and at local tracks. Let’s dive into what makes this bike a standout.

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Engine Performance: The Sweet Spot

At the heart of the KTM 350 SX-F lies its 349.7cc liquid-cooled single-cylinder engine, producing 58.1 HP (42.4 kW). The magic here isn’t just the numbers—it’s how that power is delivered. Unlike the explosive hit of a 450cc machine or the frenetic buzz of a 250cc, the 350 SX-F’s powerband feels like a perfectly tuned orchestra.

• Throttle Response: The fuel-injected system (introduced in 2011) eliminates carburetor hiccups, offering crisp throttle response. There’s no bogging down in corners, just immediate pull.
• Mid-Range Dominance: Where this engine truly shines is in its mid-range. Rolling on the throttle out of a berm or up a steep climb, the bike pulls with a linear surge that’s confidence-inspiring. Riders accustomed to 450s might miss the arm-stretching torque, but the 350 rewards with less fatigue over long motos.
• Electric Start: A game-changer in its era, the electric starter (standard on all models) ensures quick restarts after spills—no frantic kicking required.

The 5-speed transmission pairs seamlessly with the engine’s character. Shifts are buttery-smooth, and the hydraulic clutch (a KTM hallmark) requires minimal effort, even during aggressive feathering.

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Chassis and Handling: Precision Meets Playfulness

KTM’s chromoly steel frame and WP suspension setup have always been a dynamic duo, and the 350 SX-F is no exception. With a dry weight of 104.9 kg (231.3 lbs), this bike feels like a mountain bike on steroids.

• Suspension Tuning: The 48mm WP USD forks and rear shock (with 300mm/12.5 inches of front travel and 317mm/12.5 inches rear) strike a balance between plushness and rigidity. Smaller bumps are absorbed effortlessly, while big jumps land with a controlled “thud.” Adjusting the clickers can tailor the setup for technical tracks or high-speed circuits.
• Flickability: The 1495mm (58.9-inch) wheelbase and 26.5° rake angle make the 350 SX-F a cornering maestro. It’s easy to pivot mid-corner or whip the rear wheel around tight berms. Compared to bulkier 450s, this bike forgives miscalculations and encourages aggressive line choices.
• Braking Performance: Single discs front and rear (220mm/8.7 inches) with Brembo-derived calipers provide ample stopping power. The front brake’s initial bite is sharp but manageable—ideal for scrubbing speed before rutted corners.

Standing at 992mm (39.1 inches), the seat height is approachable for riders of varying statures, though shorter riders might still tip-toe. The narrow chassis design helps with grip and body positioning, especially during standing sprints.

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Design and Ergonomics: Function Over Frills

KTM’s signature orange-and-black livery ensures the 350 SX-F looks fast even when stationary. The 2011-2015 models share a minimalist aesthetic, with clean lines and a focus on durability:

• Frame and Bodywork: The steel frame is practically bulletproof, while the plastic shrouds and fenders resist cracks from roost or tip-overs.
• Special Editions: The 2012 Cairoli Edition adds flair with an Akrapovic titanium exhaust, black Excel rims, and white accents. It’s a collector’s gem, but even standard models ooze race-ready vibes.
• Rider Triangle: The handlebar-seat-footpeg relationship feels natural for aggressive riding. Grippy seat foam keeps you planted during acceleration, though aftermarket seats are popular for endurance events.

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Competition: How Does It Stack Up?

The 350cc class was niche when KTM debuted this bike, but rivals quickly took notice. Here’s how the 350 SX-F compares to its contemporaries:

1. Yamaha YZ250F (2014-2015)

• Pros: Lighter (103 kg/227 lbs), explosive top-end.
• Cons: Less mid-range torque, carbureted (pre-2015).
• Verdict: The YZ250F is a rev-happy beast, but the KTM’s fuel injection and broader powerband make it more versatile.

2. Honda CRF250R (2011-2015)

• Pros: Smooth handling, reliable engine.
• Cons: Underpowered compared to the 350 SX-F.
• Verdict: The CRF250R suits beginners, but seasoned riders will crave the KTM’s extra grunt.

3. Kawasaki KX450F (2011-2015)

• Pros: Brute-force acceleration, stable at speed.
• Cons: Heavier (112 kg/247 lbs), fatiguing in technical sections.
• Verdict: The KX450F dominates straightaways, but the 350 SX-F dances through rhythm sections.

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Maintenance: Keeping the Orange Beast Alive

The 350 SX-F is a race bike at heart, so meticulous maintenance is key. Here’s what owners need to know:

Oil and Fluids

• Engine Oil: SAE 10W-50 (1.1L/1.16 quarts with filter). Change every 10-15 hours for aggressive riding.
• Coolant: Use high-quality ethylene glycol. The system holds ~950ml (32 oz).
• Brake Fluid: DOT 4 or 5.1. Bleed annually or after heavy use.

Critical Components

• Spark Plug: NGK LMAR9AI-8. Check gap every 20 hours.
• Air Filter: Clean after every ride. The twin-air setup is efficient but clogs quickly in muddy conditions.
• Chain: The 520 chain (5/8 x 1/4) requires regular lubrication. Upgrade to an O-ring chain for longevity.

Common Upgrades

• Exhaust: The Cairoli Edition’s Akrapovic system reduces weight and boosts mid-range.
• Suspension Springs: Heavier riders may need stiffer springs for optimal sag.
• Grips and Levers: Aftermarket options improve comfort and adjustability.

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Final Thoughts: A Legacy of Balance

The 2011-2015 KTM 350 SX-F isn’t just a motorcycle—it’s a philosophy. By straddling the line between two established classes, KTM created a bike that’s as rewarding for intermediate riders as it is for pros. Whether you’re blasting through whoops or dialing in suspension settings, this machine feels like an extension of the rider.

While newer models have since evolved, this generation remains a testament to smart engineering. For riders seeking a used motocross bike that’s both forgiving and ferocious, the 350 SX-F deserves a spot on your shortlist. And when it’s time to refresh your ride, MOTOPARTS.store has the parts to keep your KTM biting at the competition’s heels.

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Specifications sheet

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