KTM 350 EXC-F Six Days (2021) Review: A Precision Tool for Hard Enduro Warriors

Introduction

The KTM 350 EXC-F Six Days isn't just a motorcycle - it's a statement of intent. Born from KTM's relentless pursuit of off-road dominance and honed through decades of International Six Days Enduro (ISDE) competition, this 2021 model represents the sweet spot between agility and authority. Designed for riders who demand competition-ready performance in a package that tolerates no excuses, this machine blurs the line between factory race bike and trail weapon. Let's dissect why this orange assassin continues to captivate hard enduro enthusiasts worldwide.

Design Philosophy: Function Dictates Form

Cloaked in the signature Six Days livery (orange/white/blue/red), the 350 EXC-F immediately communicates its purpose. Every design element serves a racing function: the high-mounted front fender clears mud, the narrow bodywork allows for aggressive rider movement, and the chrome-molybdenum steel frame shines through like exoskeletal armor.

At 960mm (37.8"), the seat height intimidates novices but gives experts the crucial stand-up leverage needed for technical terrain. The 104.3kg (229.9lbs) dry weight disappears beneath you once moving, while the 355mm (14") ground clearance laughs at rock gardens. This isn't a motorcycle that compromises - it's a scalpel designed for surgical strikes through the gnarliest trails.

Engine Performance: The Goldilocks Cylinder

The 349.7cc DOHC single-cylinder engine strikes a perfect balance in the enduro world. With 45HP (32.8kW) on tap, it delivers: - Tractability rivaling 250cc machines in technical sections - Mid-range punch that embarrasses 450cc bikes on steep climbs - A rev-happy top end for connecting trail sections

Fuel injection via Keihin EMS ensures crisp throttle response across all altitudes, while the counterbalancer shaft tames vibrations without neutering engine feedback. The magic lies in its power delivery - linear enough for slippery roots but explosive when you crack the throttle open. Paired with the 6-speed gearbox (featuring a wide-ratio 1st gear and overdrive 6th), this engine works equally well crawling through ravines or devouring fire roads.

Chassis Dynamics: WP Suspension Masterclass

KTM's partnership with WP shines through the 48mm USD Xplor forks (300mm/11.8" travel) and PDS rear shock (310mm/12.2" travel). The setup delivers: - Progressive damping that soaks up square-edged hits - Excellent bottoming resistance on high-speed G-outs - Adjustable preload/compression for varying terrain

The steel frame provides calculated flex - rigid enough for precise cornering but compliant during hard landings. Combined with the Brembo braking system (260mm front/220mm rear discs), the package inspires confidence when attacking technical descents. The 1482mm (58.3") wheelbase offers stability at speed without sacrificing flickability.

On The Trail: Dance Partner for the Skilled

Fire up the electric starter (a godsend after stalling on a 45° incline), and the 350 EXC-F immediately communicates its competition DNA. Standing on the pegs reveals its true nature - the narrow chassis allows knee-to-bike contact that's crucial for body English maneuvers.

In slow technical sections, the light front end responds to subtle weight shifts, while the torquey low-end pulls cleanly from near-idle. Attack a hill climb, and the mid-range surge plants the rear knobby without overwhelming traction. The real magic happens in flowing singletrack - flickable like a 250cc machine but with 450cc overtaking power when you need it.

The hydraulic clutch offers buttery modulation for technical work, while the gearbox's positive engagement handles clutchless upshifts during sprint sections. At speed, the suspension maintains composure through whoops, though fast desert riders might desire more high-speed damping.

Competition: Benchmarking the Middleweight

Husqvarna FE 350

Sharing the same engine but with different mapping, the Husky favors smoother power delivery. Its composite subframe offers slightly more flex, appealing to technical riders. However, the KTM counters with superior parts commonality and a more aggressive stock suspension tune.

Beta 390 RR-S

The Beta's 386cc engine prioritizes low-end grunt, making it friendlier for slower riders. However, its 114kg (251lbs) wet weight and softer suspension can't match the KTM's razor-sharp reflexes in extreme enduro conditions.

Honda CRF450X

The 450X dominates open desert with its torquier engine but feels portly at 121kg (267lbs). The KTM's 17kg (37lbs) weight advantage proves decisive in technical terrain and during recovery from drops.

Maintenance: Keeping the Orange Crush Sharp

As MOTOPARTS.store journalists, we emphasize proactive maintenance for competition machines: - Air Filter: Service every 15 engine hours using no-toil filters. Consider pre-oiled replacements for multi-day events. - Chain: The 520 chain requires regular lubrication. Upgrade to a DID ERT2 for extended durability. - Brakes: Brembo pads wear quickly in muddy conditions. Keep spares and use DOT 4/5.1 fluid from sealed containers. - Cooling: Monitor coolant levels (9L capacity) and use distilled water with corrosion inhibitors in hard water regions. - Suspension: Rebuild WP components every 100 hours. Upgrade to SKF seals for dusty environments.

Key MOTOPARTS.store Recommendations: - Hour meter kits for service intervals - Aluminum throttle tubes for reduced friction - Heavy-duty clutch kits for technical riding - Radiator guards and linkage protectors

Conclusion: The Thinking Rider's Weapon

The 2021 KTM 350 EXC-F Six Days remains relevant not because it's perfect, but because it makes perfect sense. It rewards skilled riders with capabilities that flatten learning curves while punishing complacency with its demanding nature. This isn't a motorcycle for Sunday trail riders - it's for warriors who view terrain as a challenge to be dominated rather than an obstacle to be avoided.

At MOTOPARTS.store, we understand that owning such a specialized machine requires equally specialized care. Whether you're upgrading the clutch for hard enduro duty or stocking up on air filters for a Six Days rally replica build, we've got the parts to keep your orange assassin fighting fit.

The KTM 350 EXC-F Six Days - because second place is just the first loser.

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Specifications sheet

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