Benelli BN 251 (2014-2018): A Lightweight Naked Bike That Packs a Punch

Introduction

The Benelli BN 251, produced between 2014 and 2018, is a motorcycle that embodies the Italian brand’s philosophy of blending style, accessibility, and performance. As a naked bike designed for urban agility and weekend adventures, the BN 251 targets entry-level riders and commuters seeking a machine that’s easy to handle yet spirited enough to keep things interesting. This review dives into what makes this generation of the BN 251 stand out, from its peppy single-cylinder engine to its nimble chassis, while also exploring how it stacks up against competitors and what owners should know about maintenance.

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Design & Styling: Aggressive Lines, Approachable Proportions

The BN 251’s design is a head-turner, borrowing cues from Benelli’s larger displacement siblings like the TNT series. Its sharp, angular bodywork, exposed steel trestle frame, and compact proportions give it a sporty, aggressive stance. The twin-projector headlights and minimalist LED taillight add a modern touch, while the upswept exhaust with its angular heat shield reinforces its streetfighter persona. Color options were straightforward—white, black, and red—with bold graphics that emphasize its Italian heritage.

At 2,080–2,125 mm (81.9–83.7 in) in length and a dry weight of 143–150 kg (315–331 lbs), the BN 251 feels lightweight and manageable. The seat height ranges from 780–795 mm (30.7–31.3 in), making it accessible for shorter riders. The narrow profile and 805–810 mm (31.7–31.9 in) width further enhance its urban-friendly ergonomics.

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Engine & Performance: A Lively Single-Cylinder Heart

Powering the BN 251 is a 249.2 cc liquid-cooled single-cylinder engine with a DOHC valvetrain and electronic fuel injection. Output figures hover around 25 HP (18.2 kW) at 9,000 RPM and 21–21.5 Nm (15.5–15.9 lb-ft) of torque peaking between 7,000–8,000 RPM. These numbers place it firmly in the beginner-friendly category, but don’t underestimate its character.

Throttle response is crisp, and the engine pulls eagerly from low revs, making it ideal for city traffic. The six-speed gearbox shifts smoothly, though the clutch is light enough for stop-and-go riding. On open roads, the BN 251 tops out at around 130–135 km/h (81–84 mph), with vibrations becoming noticeable above 7,000 RPM—a common trait in single-cylinder engines. Fuel efficiency is a strong suit, averaging 3.2–3.5 L/100 km (73–78 MPG), thanks to its Euro 3-compliant fuel system.

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Handling & Suspension: Urban Nimbleness Meets Stability

The BN 251’s steel trestle frame and 1,385–1,400 mm (54.5–55.1 in) wheelbase strike a balance between agility and stability. Upside-down 41 mm front forks offer 120 mm (4.7 in) of travel, while the rear monoshock provides 50–51 mm (2.0 in) of wheel travel. The setup is tuned for comfort, absorbing potholes and bumps without feeling overly soft.

Tire sizes vary slightly between model years:
- Front: 110/70-ZR17
- Rear: 140/60-ZR17 or 150/60-ZR17

The wider rear tire on later models improves grip during cornering. Braking is handled by a 280 mm front disc with a four-piston caliper and a 220–240 mm rear disc. ABS was introduced on 2018 models, a welcome addition for safety-conscious riders.

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Rider Experience: Commuting Made Fun

Swinging a leg over the BN 251 reveals an upright riding position. The handlebars are wide and positioned for leverage, while the slightly rearset footpegs keep the posture relaxed. The seat is firm but adequately padded for hour-long rides.

In the city, the bike shines. The lightweight chassis allows quick direction changes, and the narrow handlebars slip through traffic effortlessly. At highway speeds, the lack of wind protection becomes apparent, but the engine remains composed if you keep revs below 8,000 RPM. The 17-liter (4.5 US gal) fuel tank ensures fewer stops at the pump—a practical perk for daily riders.

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Competition: How Does the BN 251 Stack Up?

The lightweight naked bike segment is fiercely competitive. Here’s how the BN 251 compares to its rivals:

1. Yamaha MT-25:
2. Pros: Smoother parallel-twin engine, stronger brand reputation.

3. Cons: Higher price, less aggressive styling.

4. KTM 390 Duke:

5. Pros: 44 HP engine, premium suspension components.

6. Cons: Harsher ride quality, higher maintenance costs.

7. Honda CB300R:

8. Pros: Refined chassis, Neo-Sports Café design.

9. Cons: Less torque at low RPMs.

10. Kawasaki Z250:

11. Pros: Parallel-twin smoothness, reliability.
12. Cons: Heavier, dated aesthetics.

Verdict: The BN 251 holds its own with bold styling and a competitive price tag. While it lacks the polish of Japanese rivals or the raw power of the KTM, it’s a compelling choice for riders prioritizing affordability and Italian flair.

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Maintenance: Keeping Your BN 251 in Prime Condition

Owners of the BN 251 will appreciate its straightforward maintenance needs:

1. Oil Changes: Use 10W-40 synthetic oil every 5,000 km (3,100 mi). The wet sump system simplifies DIY changes.
2. Chain Care: Clean and lubricate the O-ring chain every 500 km (310 mi). Consider upgrading to a premium chain for longevity.
3. Valve Adjustments: Inspect every 10,000 km (6,200 mi). The DOHC setup requires precise shim adjustments.
4. Cooling System: Check coolant levels annually. Flush every 2 years or 20,000 km (12,400 mi).
5. Brakes: Replace pads every 15,000 km (9,300 mi). ABS models benefit from regular sensor checks.

MOTOPARTS.store Recommendations:
- Upgrade to sintered brake pads for sharper stopping power.
- Install a DNA air filter to improve throttle response.
- Swap stock tires for Michelin Road 5s for better wet grip.

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Conclusion: A Charismatic Entry-Level Machine

The Benelli BN 251 is a motorcycle that punches above its weight class. Its lively engine, agile handling, and eye-catching design make it a joy for urban commuting and weekend rides alike. While it doesn’t redefine the segment, it offers a refreshing alternative to cookie-cutter Japanese models. For new riders or seasoned motorcyclists seeking a lightweight daily companion, the BN 251 deserves a spot on your shortlist.

Whether you’re tweaking its performance with aftermarket parts or simply keeping it stock, MOTOPARTS.store has the accessories and expertise to enhance your BN 251 experience. Ride safe, and keep the rubber side down!

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Specifications sheet

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