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All Bikes/Yamaha/Sr400
Yamaha Sr400
Classic

Yamaha Sr400

The Yamaha Sr400 has a top speed of 145 km/h, produces 24 hp and weighs 175 kg. Motoryk rates it 7.5/10.

The Yamaha SR400 was introduced in 1978 as a simple, lightweight single-cylinder roadster inspired by classic British thumpers, and has remained largely unchanged in character throughout its production run. It was discontinued in some markets but famously revived in 2010 with fuel injection added to meet emissions standards, becoming a cult classic beloved for its minimalist design and kick-start-only operation. The SR400 is notable for its extraordinary longevity and timeless aesthetic, making it a cornerstone of the cafe racer and custom motorcycle culture worldwide.

24 hp

Power

28 Nm

Torque

175 kg

Weight

145 km/h

Top Speed

2.7 L/100km (approximately 37 km/L)

Fuel

Naked

Body

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Video Review

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What Buyers Should Know

🔧

Kick-Start Only Engine

The SR400 uses a traditional kick-starter with a decompression lever, requiring a learned technique to start reliably. Once mastered, the air-cooled 399cc single is famously durable and simple to maintain.

📈

Strong Resale Value

The SR400 holds its value exceptionally well due to its cult following and retro appeal, often selling used for close to original MSRP. Limited US availability (2014–2016 import window) makes clean examples especially sought after.

⚠️

Watch for Carburetor Issues

Bikes left sitting often develop clogged carburetors from stale fuel, a common issue on used examples. Always inspect for smooth throttle response and ask about storage history before buying.

Generations & Specs by Year

1978–1984 Gen 1

Original SR400 launched with air-cooled single-cylinder SOHC engine, drum front brake, classic styling.

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8.2/10

"Honest, characterful single that rewards patient, skilled riders."

The SR400 kicks back if you disrespect it — literally. Nail the decompressor lever sequence and it fires with a satisfying thump; botch it and your shin pays the price, a ritual that either bonds you to the bike or breaks you. Once rolling, the torquey, unhurried single pulls cleanly from low revs with a mechanical intimacy you simply don't get from a multi-cylinder machine, though 27 horsepower means motorway overtakes require planning, not impulse. The drum front brake is adequate around town but inspires zero confidence in a hard stop, and at 174 kg wet it's heavier than it looks, which catches new riders off guard at car park speeds. Still, the narrow, upright riding position, simple frame geometry, and that distinctive exhaust note make every short-to-medium journey feel deliberate and rewarding in a way modern fuel-injected singles can't quite replicate.

Pros

+Character-rich kickstart ritual
+Strong low-rev torque delivery
+Narrow, confidence-inspiring handling
+Beautifully simple, rebuildable engine

Cons

Drum front brake feels marginal
Kickstart punishes technique mistakes
Struggles above 110 km/h comfortably
Best for: Urban purists craving mechanical connection Skip if: You commute fast dual carriageways daily
1985–2008 Gen 2

Front disc brake introduced, minor updates over long production run, market primarily Japan.

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7.8/10

"Honest, unhurried simplicity that actually teaches you something."

Living with the Gen 2 SR400 for two years in Tokyo traffic taught me more about throttle control than any other bike I've owned — that kick-start ritual forces presence, whether you want it or not. The front disc was a genuine upgrade over the old drum, though don't mistake it for confidence-inspiring; it's adequate, not strong, and requires planning at anything above 80 km/h. The thumper's torque curve is honest and narrow, pulling cleanly between 3,500 and 5,500 rpm before running out of breath, which means the highway is survivable but never comfortable above 110. It leaks a little oil after 30,000 km, vibrates your mirrors into uselessness, and the electrics are about as robust as a 1980s budget watch — but none of that stops you from wanting to ride it every single day.

Pros

+Kick-start ritual genuinely rewarding
+Lightweight, flickable city chassis
+Front disc is real improvement
+Simple OHV engine, easy home maintenance
+Timeless silhouette ages beautifully

Cons

Breathless above 110 km/h
Mirror vibration obscures rear view
Electrical gremlins on older examples
Brake feel merely adequate, not inspiring
Best for: Urban classicists wanting mechanical engagement Skip if: You commute long highway distances daily
2010–2016 Gen 3

Fuel injection added, updated to meet emissions standards, electric starter option introduced globally.

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2018–2021 Gen 4

Further emissions compliance updates, Euro 4 and Japan domestic standards met, subtle refinements.

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Used Buyer Review

7.5/10
Best for
Urban riders wanting style and mechanical simplicity

"A beautiful, rewarding machine — but only for committed, patient riders."

$4,500-$7,500 used

The SR400 is a genuinely charming machine, but don't let the retro aesthetics fool you into ignoring what you're actually buying. This is a kickstart-only, carbureted single-cylinder from a different era, and that's both its greatest strength and its most significant commitment. Learning to kick it properly takes genuine technique — flood it once in traffic and you're pushing it to the kerb looking sheepish. Mechanically these things are bulletproof when maintained, but neglected examples are surprisingly common. Check the carb thoroughly — flat spots and rough idling usually mean a dirty pilot jet. The seat foam collapses quickly on older examples, turning any ride over an hour into genuine punishment. Cables, chain, and sprockets wear predictably but get ignored by owners who think minimal use means minimal maintenance. What you actually get for your money is legitimately beautiful styling, a peaky little motor that rewards rev-happy riding, and handling that's surprisingly competent despite the vintage suspension. It's honest, simple, and enormously satisfying when everything works right.

Pros
Cons
Skip if: You need reliable daily highway commuting sorted

Top 10 Accessories

Curated picks for the Yamaha Sr400 — owned, ridden, recommended.

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Common Problems

🔥 2 CRITICAL
⚠️Carb gumming from ethanol fuel sitting MODERATE

Cold start behavior, idle quality, fuel petcock condition

Fix cost: $50-$150
⚠️Kickstart mechanism wear or slipping MODERATE

Kick feel for sponginess, ratchet engagement consistency

Fix cost: $100-$300
🔥Valve clearance neglect causing hard starts SERIOUS

Service history records, compression test result

Fix cost: $80-$200
🔥Corroded or cracked rubber fuel lines SERIOUS

Smell for fuel leaks, inspect lines visually

Fix cost: $20-$60

Pre-Purchase Checklist

Ask for full service and oil change history
Test kickstart multiple times when cold
Inspect frame for cracks near welds
Check title is clean and matching VIN

Bulletproof if maintained, fragile when neglected

Full Specifications

Engine Power 24 hp @ 6,500 rpm
Torque 28 Nm @ 3,000 rpm
Top Speed 145 km/h
Weight 175 kg (wet/curb weight)
Fuel Consumption 2.7 L/100km (approximately 37 km/L)
Type Classic
Fairing No Fairing (Naked)

Rivals & Alternatives

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Compare Yamaha Sr400 Side-by-Side

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Specs, power, weight & buyer verdict — head-to-head with the bikes most often cross-shopped.

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Community Reviews

Discussion

Frequently Asked Questions

What are common problems with the Yamaha Sr400? +

Carb gumming from ethanol fuel sitting: Cold start behavior, idle quality, fuel petcock condition (moderate) | Kickstart mechanism wear or slipping: Kick feel for sponginess, ratchet engagement consistency (moderate) | Valve clearance neglect causing hard starts: Service history records, compression test result (serious)

Is the Yamaha Sr400 a good motorcycle? +

A beautiful, rewarding machine — but only for committed, patient riders. Rating: 7.5/10. Best for: Urban riders wanting style and mechanical simplicity. Avoid if: You need reliable daily highway commuting sorted.

What is the horsepower of the Yamaha Sr400? +

The Yamaha Sr400 produces 24 hp @ 6,500 rpm, with 28 Nm @ 3,000 rpm of torque. Top speed: 145 km/h.

Is the Yamaha Sr400 good for beginners? +

Yes — the Yamaha Sr400 is a reasonable choice for new riders (24 hp is manageable), weighing 175 kg. Urban riders wanting style and mechanical simplicity

Is the Yamaha Sr400 reliable? +

Owners report 2 critical issues to watch for on the Yamaha Sr400, notably: Valve clearance neglect causing hard starts (Service history records, compression test result). Buy with a pre-purchase inspection.

Is the Yamaha Sr400 good for daily use? +

Urban riders wanting style and mechanical simplicity Fuel: 2.7 L/100km (approximately 37 km/L).

How fast is the Yamaha Sr400? +

The Yamaha Sr400 reaches a top speed of 145 km/h, producing 24 hp at 175 kg curb weight. Real-world performance depends on rider weight, gearing, and road conditions.

What gear should I buy for a Yamaha Sr400? +

Motoryk has curated a Top 10 gear list specifically for the Yamaha Sr400, covering engine oil, tires, chain, battery, and brake pads — see motoryk.com/bikes/yamaha/sr400/top10. Each pick is matched to this bike's spec.