Honda CB 900 F (1981): The Short-Lived Legend That Packed a Punch

Introduction

The 1981 Honda CB 900 F occupies a unique space in motorcycling history. Part of Honda's iconic CB series, this model generation existed for just one year, yet left an indelible mark with its blend of raw power, muscular styling, and engineering that straddled the line between classic UJM (Universal Japanese Motorcycle) principles and emerging sportbike ambitions. Designed as a "gentleman's express," it combined touring comfort with enough performance to keep adrenaline seekers hooked. Having spent time with this machine, I can confirm it's like riding a well-tuned orchestra – every component plays its part, but the 902cc inline-four is the conductor stealing the show.

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Design & First Impressions

The CB 900 F's design screams late-70s muscle. Its angular fuel tank (20-liter capacity) dominates the profile, flanked by a stepped dual seat (815mm/32" seat height) that accommodates rider and pillion without sacrificing sporty proportions. The 37mm telescopic fork and twin shock rear suspension hint at its all-rounder ambitions, while the ComStar wheels add a touch of technical flair.

Standout details include the twin round headlights – a rarity in Honda's lineup – and the chunky exhaust system that looks like it means business. At 260kg (573 lbs) wet, it’s no featherweight, but the weight distribution feels neutral when straddling the bike. The analog instrumentation is pure retro charm, with a large tachometer taking center stage.

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Engine & Performance: The Heart of the Beast

The 902cc DOHC inline-four is the star here, producing 95 PS (70 kW) at 9,000 RPM. Cold starts require patience (that 1,000 ± 100 RPM idle needs careful choke management), but once warm, the engine transforms into a turbine-smooth operator. Power builds linearly from 3,500 RPM, with a visceral surge past 6,000 RPM that pins you to the seat. The 17/44 sprocket combo keeps acceleration aggressive yet manageable, hitting 0-100 km/h (0-62 mph) in under 5 seconds – blistering for 1981.

The quad carburetors (with air screws set at 2 turns out) deliver crisp throttle response. At highway speeds, the engine hums contentedly at 6,500 RPM in top gear, making long-distance cruising surprisingly relaxed. The air-cooling system proves adequate unless stuck in traffic, where heat soak becomes noticeable – a small price for the engine's mechanical simplicity.

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Handling: Heavyweight Contender

Weighing 260kg (573 lbs), the CB 900 F isn’t a canyon carver by modern standards. Yet the chassis shines with a planted, confidence-inspiring stance. The 37mm front forks and preload-adjustable rear shocks handle bumps competently, though rough roads can feel jarring.

Where this Honda surprises is in sweepers. Lean it into a corner, and the weight seems to melt away, held steady by the 106-link chain final drive’s precise power delivery. The Bridgestone tires (2.25 bar/32.6 psi front, 2.5 bar/36.3 psi rear) offer decent grip, but modern rubber would unlock hidden potential. Braking duties fall to dual front discs and a rear drum – adequate for the era, but requiring firm lever pressure by today’s standards.

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Comfort & Practicality

Honda nailed the ergonomics. The slightly rear-set pegs and wide bars create a natural riding position – upright enough for visibility, sporty enough for spirited rides. The seat firms up after an hour, but the real limitation is wind protection. At speeds above 110 km/h (68 mph), the rider becomes a human sail.

Practical touches abound:
- Tool-free air filter access
- Center stand for chain maintenance (critical with the 17/44 sprocket combo)
- Generous 4.5L oil capacity (with filter) extends service intervals

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Competition: How It Stacked Up

The CB 900 F faced fierce rivals in 1981:

1. Kawasaki Z1-R (1000cc)

• Power: 90 PS (weaker despite larger engine)
• Edge: More aggressive styling
• Downside: Heavier steering at low speeds

2. Yamaha XS1100

• Power: 95 PS (similar)
• Edge: Shaft drive convenience
• Downside: Porkier 263kg (580 lbs) weight

3. Suzuki GSX1100E

• Power: 111 PS (superior)
• Edge: Advanced TSCC engine tech
• Downside: Harsher ride quality

Honda’s Advantage: Balance. The CB 900 F split the difference between the Z1-R’s brutishness and the XS1100’s touring focus. Its chain final drive (vs. Yamaha’s shaft) allowed lighter weight and better feedback, while the engine’s broad powerband outshone the peakier GSX.

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Maintenance: Keeping the Legend Alive

As a MOTOPARTS.store journalist, I’ll focus on key upkeep aspects:

1. Valve Adjustments

• Intake/Exhaust Clearance: 0.06-0.13mm (0.002-0.005")
• Frequency: Every 4,800 km (3,000 miles)
• Tip: Use feeler gauges before the engine cools completely

2. Oil Changes

• Capacity: 4.5L (4.76 qt) with filter
• Recommended: SAE 10W-40 semi-synthetic
• Pro Tip: Replace the crush washer every change to prevent leaks

3. Chain Care

• 106-link DID chain: Clean every 800 km (500 miles)
• Adjustment: 25-35mm (1-1.4") free play
• MOTOPARTS Recommendation: Upgrade to an O-ring chain for longevity

4. Carb Tuning

• Air Screw Setting: 2 turns out (baseline)
• Common Issue: Clogged pilot jets from ethanol fuel – install inline filters

5. Brake System

• Fluid: DOT 4 (replace biannually)
• Upgrade Path: Swap pads for sintered compounds

6. Tire Pressure

• Front: 2.25 bar (32.6 psi)
• Rear: 2.5 bar (36.3 psi)
• Modern Upgrade: Radial tires improve grip without altering character

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Conclusion: Timeless Appeal

The 1981 CB 900 F is a motorcycle of contrasts – brutish yet refined, heavy yet agile, simple yet sophisticated. Its single-year production run makes it a rare gem, but parts availability remains strong thanks to Honda’s modular design.

Would I daily one? Absolutely, with upgraded brakes and tires. Is it a collectible? Undoubtedly. For owners, MOTOPARTS.store carries everything from NGK DR8ES spark plugs (gap to 0.7mm/0.028") to period-correct decals. Whether you’re restoring a survivor or optimizing a rider, this CB remains a testament to an era when "more cylinders" meant "more soul."

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Specifications sheet

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