KTM 250 EXC-F Six Days [2017-2020]: A Trailblazer Revisited

When KTM unleashed the 250 EXC-F Six Days edition for the 2017-2020 model years, it wasn’t just another enduro bike – it was a statement. Designed for riders who demand race-ready performance with trail adaptability, this Austrian machine blends lightweight agility with serious off-road credentials. After spending time with this orange beast across rocky ascents, muddy ruts, and forest singletracks, here’s why it remains a benchmark in the 250cc enduro segment.

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The Heartbeat: Engine & Power Delivery

At the core of the 250 EXC-F Six Days lies a 249.9cc liquid-cooled DOHC single-cylinder engine, producing 43 HP (32 kW). This isn’t just raw power – it’s precision-tuned for enduro versatility. The fuel-injected mill (replacing carburetion in this generation) delivers crisp throttle response, whether you’re crawling through technical sections or pinning it across open terrain.

The Keihin EMS ignition system ensures smooth cold starts, though purists will appreciate that pre-2020 models retain the backup kickstarter. With a 6-speed gearbox and Brembo hydraulic clutch, shifts are buttery precise. The 13/52 sprocket combo provides a grunty low end while still allowing comfortable cruising at higher speeds. Riders accustomed to two-strokes will notice the four-stroke’s linear powerband – less explosive but far more manageable in slippery conditions.

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Chassis & Handling: Dancing With Precision

Weighing in at 103.5 kg (228 lbs) dry, the Six Days feels like a mountain bike on steroids. The chromoly steel central-tube frame strikes a perfect balance between stiffness for aggressive riding and flex for absorbing trail chatter. Paired with WP’s 48mm Xplor USD forks (300mm travel) and a PDS rear shock (310mm travel), the suspension setup is plush yet progressive. Out of the box, it’s tuned for hard enduro – expect minimal bottoming on big hits and excellent small-bump compliance.

The 960mm (37.8") seat height is intimidating for shorter riders but pays dividends in ground clearance (355mm/14"). Stand-up riders will appreciate the narrow ergonomics, though aftermarket lowered seats are popular for technical terrain. Steering is razor-sharp thanks to the 26.5° rake and 1482mm (58.3") wheelbase – flickable between trees yet stable at speed.

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Braking & Wheels: Controlled Aggression

Brembo’s floating calipers bite 220mm discs front and rear. The brakes are a masterclass in modulation – enough power to stoppie on demand but never grabby in mud. The chain final drive (5/8 x 1/4") and DID rims withstand abuse, though many riders upgrade to reinforced sprockets for extreme conditions.

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Fuel & Cooling: Keeping Its Cool

The 8.5-9L (2.25-2.38 gal) tank is modest but practical for enduro sprints. Fuel injection eliminates altitude headaches, a boon for mountain riders. Liquid cooling (1.2L capacity) keeps temps in check during slow technical work, though adding a fan kit is wise for brutal summer races.

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The Six Days Edge: What Sets It Apart

This isn’t a standard EXC-F with stickers. The Six Days package includes: - CNC-machined triple clamps - High-grip seat cover - Factory-style skid plate - Airbox drainage system - Signature blue-anodized hubs

These aren’t just cosmetic tweaks – they’re battle-hardened upgrades from KTM’s Six Days International competition experience.

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Competition: How It Stacks Up

Yamaha WR250F

Yamaha’s offering is 7kg heavier but appeals to riders wanting a softer power delivery. The WR’s suspension is plusher for trail use but lacks the WP components’ adjustability. KTM dominates in aftermarket support.

Honda CRF250X

Honda’s reliability is legendary, but the CRF feels dated compared to the KTM’s FI system. The Six Days’ power-to-weight ratio (0.42 HP/kg vs 0.37 HP/kg) gives it a clear edge in technical climbs.

Husqvarna FE 250

Sharing the same engine platform, the Husky differentiates with composite subframes and Air forks. Riders preferring a plusher initial stroke lean Husky; those wanting direct feedback stick with KTM.

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Maintenance: Keeping the Beast Alive

Oil & Filter

• Oil capacity: 1L (1.06 qt) with filter
• Recommended: Motorex Cross Power 10W-50
• Interval: 15hrs trail riding / 10hrs racing

Pro tip: Install a magnetic drain plug to catch metal shavings from hard clutch use.

Air Filter

The injected engine is sensitive to dirt. Clean the dual-layer filter every 5-10hrs using biodegradable cleaner. Consider pre-oiled replacements for race days.

Valves

• Intake: 0.10-0.15mm (0.004-0.006")
• Exhaust: 0.13-0.18mm (0.005-0.007") Check every 30hrs – shim-under-bucket design requires patience but stays stable.

Suspension

• Fork oil: 610ml SAE 4W per leg
• Service interval: 100hrs for seals, 200hrs for full rebuild

Upgrade the fork’s mid-valve for heavier riders or faster terrain.

Chain & Sprockets

The stock 13/52 combo wears quickly in mud. Swap to a DID ERT2 chain and steel sprockets for longevity. Always adjust slack to 55-60mm (2.2-2.4").

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The Verdict: Who’s It For?

The 250 EXC-F Six Days isn’t a beginner bike – it’s a scalpel for riders who live in the red zone. The steep seat height and aggressive ergos demand commitment, but reward with unparalleled agility. It shines in: - Hard enduro competitions - Technical single-track - Hillclimb events - ADV riders wanting a lightweight partner

For motocross tracks or fire-road cruisers, look elsewhere. But if your idea of fun involves logs, boulders, and switchbacks that defy gravity, this KTM is your spirit animal.

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MOTOPARTS.store Recommendations

1. Barkbusters Storm Handguards – Save those levers in tip-overs
2. Tubliss Tire System – Run 5psi without pinch flats
3. SXS Clutch Kit – For riders who abuse the left lever
4. FMF Q4 Silencer – Trail-legal without choking the beast
5. Seat Concepts Comfort XL – Tame the stock plank

Whether you’re prepping for a Six Days qualifier or just want the sharpest tool in the woods, the 250 EXC-F remains a modern classic. Treat it right, and it’ll defy the impossible – season after season.

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Specifications sheet

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