KTM 350 EXC-F Six Days [2012-2015]: The Enduro Bridge Between Agility and Power

Introduction

The KTM 350 EXC-F Six Days isn’t just a motorcycle—it’s a statement. Born from KTM’s relentless pursuit of offroad dominance and refined through the brand’s legendary Six Days International Trophy experience, this bike straddles the line between lightweight agility and big-bore power. Designed for riders who demand the flickability of a 250cc machine with the grunt of a 450cc, the 350 EXC-F Six Days (2012-2015) remains a benchmark in the enduro world.

Having recently thrown a leg over a well-maintained 2014 model, I can confirm: this machine still feels like a cheat code for technical trails. Let’s break down why.

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Engine Performance: The Sweet Spot of Versatility

At the heart of the 350 EXC-F Six Days is its 349.7cc liquid-cooled single-cylinder engine. With a 88mm bore and 57.5mm stroke, this DOHC powerplant revs freely to 13,000 RPM, thanks to its ultra-short-stroke design and titanium valves. The magic lies in its balance. Unlike peaky 250s or intimidating 450s, the 350 delivers linear power that’s manageable in tight singletrack yet potent enough to loft the front wheel over logs with a flick of the wrist.

The Keihin EFI system ensures crisp throttle response, even at altitude, while the optional map select switch (included in Six Days trim) lets you toggle between aggressive and tame fueling profiles. During my test ride, the "aggressive" map transformed the bike into a fire-breathing trail weapon, while the softer setting smoothed out technical climbs.

Key highlights:
- Balancer shaft: Virtually eliminates vibrations—a rarity in single-cylinders.
- Brembo hydraulic clutch: Feather-light pull with precise modulation, even after hours of clutch-heavy riding.
- 6-speed transmission: Tall sixth gear makes connecting trail sections less frantic.

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Chassis and Handling: Precision Meets Durability

KTM’s chromoly steel frame and cast aluminum subframe strike a perfect balance between flex and rigidity. Paired with the WP Suspension 4860 MXMA fork (300mm travel) and WP PDS 5018 DCC shock (335mm travel), the bike floats over roots and rocks while remaining planted in high-speed chop.

The geometry is pure enduro:
- Steering head angle: 63.5° (26.5° rake) for sharp turn-in.
- Wheelbase: 1,482mm (58.3")—agile but stable.
- Ground clearance: 345mm (13.6") to glide over obstacles.

At 107.5 kg (237 lbs) dry, the 350 EXC-F feels shockingly light. Flicking it through switchbacks or pivoting on the pegs during hairpin turns requires minimal effort. The Giant rims and black tin-nickel spokes reduce unsprung weight, making the suspension react quicker to trail trash.

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Six Days Upgrades: Race-Ready Out of the Box

The Six Days edition isn’t just a sticker kit. It’s a curated selection of upgrades that reflect KTM’s factory racing insights:

1. Camel SXS Seat: 970mm (38.2") height is tall but manageable, and the reshaped foam reduces fatigue during marathon rides.
2. CNC Triple Clamps: Improved fork alignment for buttery-smooth action.
3. Radiator Fan: No more boil-overs in slow, technical terrain.
4. Full Rear Brake Disc: Better heat dissipation for consistent stopping power.
5. Knock-Out Wheel Spindles: Tool-free front wheel changes—a lifesaver during races.

The bike’s aesthetics—orange frame, anodized components, and minimalist Six Days graphics—scream “factory rider” without being garish.

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Competition: How It Stacks Up

Yamaha WR250F

• Pros: Bulletproof reliability, lower seat height (960mm/37.8").
• Cons: Down on power (250cc), heavier at 113kg (249 lbs).
• KTM Edge: The 350’s torque advantage is glaring on steep climbs.

Honda CRF250RX

• Pros: Smooth power delivery, legendary Honda build quality.
• Cons: No electric start, softer suspension for hard enduro.
• KTM Edge: WP suspension handles big hits better; hydraulic clutch.

Husqvarna FE350

• Pros: Similar engine, composite subframe for weight savings.
• Cons: Less adjustable suspension stock-to-stock.
• KTM Edge: Six Days edition includes more race-ready extras.

Beta 350RR

• Pros: Softer power for beginners, Öhlins suspension option.
• Cons: Heavier at 110kg (242.5 lbs), slower-revving engine.
• KTM Edge: Aggressive riders will prefer the EXC-F’s explosive midrange.

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Maintenance: Keeping the Orange Beast Alive

The 350 EXC-F Six Days is low-maintenance for a race bike but demands attention to stay sharp:

1. Oil Changes:
2. Use 1.2L of SAE 10W-50 (API SH) every 15-20 hours.

3. MOTOPARTS.store recommendation: Liqui Moly Offroad 4T 10W-50.

4. Valve Checks:

5. Intake: 0.10–0.15mm (0.004–0.006") / Exhaust: 0.13–0.18mm (0.005–0.007").

6. Check every 30 hours. Shim-under-bucket design requires patience.

7. Cooling System:

8. Replace 1.2L of coolant annually.

9. MOTOPARTS.store tip: Add a high-flow water pump impeller for extreme conditions.

10. Chain & Sprockets:

11. Stock 14/52 gearing works for most; swap to a 13T front sprocket for tighter trails.

12. Use a quality O-ring chain—the stock 5/8" x 1/4" lasts ~1,500km (930 miles).

13. Brakes:

14. DOT 4 fluid yearly. Upgrade to Brembo sintered pads for muddy races.

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Final Verdict

The KTM 350 EXC-F Six Days (2012-2015) is a timeless enduro weapon. It’s for riders who want to attack technical trails without arm pump, race harescrambles without compromises, and own a bike that feels as special as it performs. While newer models have evolved, this generation remains a favorite among purists for its raw, mechanical feedback and minimal electronics.

Whether you’re reviving a used example or upgrading a well-loved machine, MOTOPARTS.store has the OEM and aftermarket support to keep your Six Days fighting fit. From CNC levers to heavy-duty skid plates, we’ve got your back—because this bike deserves to be ridden, not retired.

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Specifications sheet

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