Sherco 300 SEF Factory [2018-2022]: A Rider’s Perspective on the Enduro Specialist

Introduction

The Sherco 300 SEF Factory represents a fascinating duality in the enduro world. From 2018 to 2022, this model generation offered riders a choice between two distinct personalities: the raw, snappy 300 SE two-stroke and the smoother, torque-focused 300 SEF four-stroke. Both variants share Sherco’s obsession with precision engineering and race-ready components, but they cater to different riding philosophies. After spending time with this machine across rocky trails, muddy forests, and technical hill climbs, it’s clear why Sherco has become a dark horse favorite among hardcore enduro enthusiasts.

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Design & Ergonomics: Where Form Meets Function

At first glance, the 300 SEF Factory looks lean and purposeful. The semi-perimeter chrome-molybdenum steel frame (shared across both engine types) gives the bike a narrow waist, making it easier to grip with your knees during aggressive maneuvers. With a seat height of 950 mm (37.4 inches), it’s accessible for riders of average height, though shorter riders might still need a slight hop to mount up. The Michelin Enduro Medium/Competition tires (1.60-21 front, 2.15-18 rear) strike a balance between grip and durability, while the blue-anodized Excel rims add a touch of factory flair.

The cockpit is minimalist but functional. Sherco keeps the focus on rideability rather than gadgets, though the electric starter (a blessing in muddy conditions) and lithium battery ensure reliability. Color schemes evolved during this generation from bold blue/white/green combinations to more muted racing-inspired palettes, but all versions share a no-nonsense aesthetic that says “ready to race.”

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Engine Performance: Two-Stroke Snarl vs. Four-Stroke Versatility

The Two-Stroke 300 SE Factory

The 293.1cc liquid-cooled two-stroke (72mm bore x 72mm stroke) is a riotous engine that rewards skilled riders. Fed by a Keihin PWK36 carburetor, it delivers that classic two-stroke hit – explosive mid-range power that’s perfect for lofting the front wheel over logs or blasting out of corners. Unlike older dirt bikes, the hydraulic-actuated clutch (a Brembo specialty) allows for feather-light lever action, making it easier to modulate power in technical sections.

The Four-Stroke 300 SEF Factory

In contrast, the 303.7cc DOHC four-stroke (84mm bore x 54.8mm stroke) uses Synerject electronic fuel injection for smoother, more predictable power delivery. The engine’s dry-sump lubrication keeps weight low and allows for steeper lean angles. With 4 valves and a 6-speed gearbox, it’s remarkably flexible – tractable enough for slow-speed crawling yet eager to rev out on open trails. The Akrapovic exhaust (on later models) gives it a throaty bark without being obnoxious.

Both engines share a 102 kg (224.9 lb) dry weight, making the Sherco feel noticeably lighter than some 450cc competitors. The two-stroke’s simplicity shines in deep mud where maintenance access matters, while the four-stroke’s torque advantage (and Euro 3 compliance) makes it better suited for mixed-terrain adventures.

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Suspension & Handling: KYB’s Masterclass

Sherco’s partnership with KYB resulted in one of the most capable stock suspension setups in enduro. The 48mm KYB closed-cartridge forks offer 300 mm (11.8 inches) of travel, adjustable for compression and rebound. Out back, the KYB shock absorber provides 330 mm (13 inches) of rear wheel travel with a 3-way hydraulic adjustment system.

On rocky descents, the suspension absorbs square-edged hits without deflecting, while the 355 mm (14 inches) ground clearance ensures skid plates rarely scrape. The shorter 1465-1480 mm (57.7-58.3 inches) wheelbase (depending on year) makes the bike feel nimble in tight woods, though it remains stable at higher speeds thanks to the frame’s torsional rigidity.

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Brakes & Wheels: Controlled Aggression

Brembo’s influence is unmistakable here. The 220 mm (8.7-inch) front and rear discs (single-piston calipers) offer progressive bite rather than an on/off feel – crucial when navigating slippery roots or loose gravel. Some riders might upgrade to larger wave rotors for extreme downhill work, but the stock setup works admirably for most conditions. The Michelin tires, while not as aggressive as pure competition knobbies, provide predictable traction across varied terrain.

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Competition: How the Sherco Stacks Up

The 300 SEF Factory’s closest rivals include:

1. KTM 300 XC-W TPI:
   KTM’s fuel-injected two-stroke is more technologically advanced, but the Sherco counters with superior suspension out of the box and a more refined hydraulic clutch.

2. Beta 300 RR:
   Beta’s smoother power delivery appeals to technical riders, though the Sherco feels more agile at speed and benefits from KYB suspension versus Beta’s Sachs components.

3. Husqvarna TE 300i:
   Similar to the KTM but with a different ergonomic philosophy. The Husky’s composite subframe saves weight, but Sherco’s steel frame offers better durability for hard impacts.

For four-stroke fans, the Sherco 300 SEF competes with: - KTM 350 EXC-F: More horsepower but heavier (113 kg vs. Sherco’s 102 kg) - Honda CRF450RL: Better for dual-sport use but less focused on pure enduro performance

Sherco’s trump card is its niche appeal – it’s the choice for riders who want boutique-level components without the mainstream brand markup.

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Maintenance: Keeping Your Sherco in Fighting Shape

1. Air Filter Access:
   The twin-air filter is easily reachable under the seat. In dusty conditions, clean it every 10-15 hours. Consider adding a pre-filter wrap for desert rides.

2. Suspension Service:
   KYB forks need fresh oil every 40-50 hours. For aggressive riders, upgrading to SKF seals improves longevity.

3. Hydraulic Clutch:
   The Magura/Brembo system rarely needs bleeding, but keep an eye on fluid levels. MOTOPARTS.store offers pre-bled clutch kits for quick swaps.

4. Two-Stroke Care:
   For 300 SE owners, use high-quality synthetic oil at a 60:1 ratio. The power valve system requires cleaning every 30-40 hours.

5. Four-Stroke Upkeep:
   The SEF’s timing chain tensioner should be inspected annually. Valve clearances (DOHC) typically hold for 80+ hours thanks to Sherco’s robust valve train.

Pro Tip: The lithium battery hates cold storage. Use a tender during offseason and consider MOTOPARTS.store’s anti-vibration battery mounts to extend its life.

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Conclusion: A Wolf in Sheep’s Clothing

The Sherco 300 SEF Factory isn’t just another enduro bike – it’s a statement. Whether you prefer the adrenaline rush of the two-stroke or the four-stroke’s refined power, this generation delivers a level of sophistication that belies its “underdog” status. The KYB suspension alone justifies the price of admission, while details like the hydraulic clutch and Excel rims show Sherco’s commitment to premium components.

For riders who value individuality and are willing to step off the KTM/Husqvarna/Yamaha treadmill, the 300 SEF Factory offers a compelling mix of French engineering and no-compromise performance. Just don’t be surprised when it outshines more famous rivals on your local trails.

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Specifications sheet

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