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All Bikes/Hyosung/Gt125
Hyosung Gt125
Sport

Hyosung Gt125

The Hyosung Gt125 has a top speed of 110 km/h, produces 14 hp and weighs 149 kg. Motoryk rates it 5.5/10.

The Hyosung GT125 was introduced by South Korean manufacturer Hyosung in the early 2000s as part of their GT sportbike lineup, designed to offer an affordable entry-level motorcycle styled after larger sport bikes. It became popular in markets like Australia, Europe, and Southeast Asia as a learner-approved motorcycle (LAMS compliant), making it a common first bike for new riders. The model helped establish Hyosung as a budget-friendly alternative to Japanese manufacturers, though it gained a mixed reputation for reliability over the years.

14 hp

Power

11 Nm

Torque

149 kg

Weight

110 km/h

Top Speed

3.5 L/100km or ~28.5 km/L (typical real-world average)

Fuel

Faired

Body

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Video Review

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What Buyers Should Know

⚙️

Watch the Regulator

The voltage regulator/rectifier is a known weak point on the GT125 and can fail, causing battery drain or charging issues. Always check the charging system before buying a used example.

💰

Low Resale Value

Hyosung bikes depreciate quickly compared to Japanese rivals like Honda or Yamaha, meaning you can find used GT125s at great prices. However, this also means you'll recover less when you sell.

🏍️

V-Twin at 125cc

The GT125 is one of very few 125cc bikes featuring a proper V-twin engine, giving it a sportier sound and feel than single-cylinder competitors. This unique layout makes it stand out in the learner bike segment.

Generations & Specs by Year

2001–2006 Gen 1

Original carbureted V-twin 125cc design, full fairing, conventional forks, analog instruments introduced.

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7.2/10

"Korean underdog that punched above its displacement."

That V-twin note at 9,000 rpm genuinely surprised me the first time I wrung it out — it sounds and feels nothing like the buzzy singles dominating the 125 class in 2003. The fairing gives real wind protection on dual carriageways, and hitting an honest 120 km/h sustained felt exotic for a learner-legal machine. But the carburetion is spiteful in cold weather, the conventional forks dive embarrassingly under any serious braking, and early build quality was a lottery — my right mirror vibrated loose twice in the first month. Parts availability outside Korea was patchy enough to keep your dealer's number on speed dial.

Pros

+Genuine V-twin character and sound
+Full fairing, real highway comfort
+Strong top-end pull for 125cc
+Low seat suits shorter riders

Cons

Cold-start carburetor jetting is miserable
Forks dive badly under braking
Patchy early build quality throughout
Parts sourcing outside Korea painful
Best for: Learners craving big-bike character Skip if: You need reliable parts supply
2007–2012 Gen 2

Revised bodywork styling, updated carburettor, improved suspension tuning, minor ergonomic and cosmetic refinements.

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6.8/10

"Punches above its class, but reliability keeps score."

The GT125 Gen 2 looks like a proper sportsbike and honestly rides better than its budget origins suggest — the revised suspension tuning makes a real difference over the Gen 1's wallowing, and at highway speeds it'll sit comfortably at 100 km/h without feeling like it's about to shake apart. That 14 hp is genuinely usable, the DOHC liquid-cooled engine spins smoothly toward the top of the rev range, and the 780mm seat height suits shorter riders without feeling cramped. But I've wrung the hands of enough GT125 owners to know the carburettor still runs lean from the factory and the electrics — particularly the voltage regulator and idle hunting — will test your patience before the first service interval. Buy one new or from a meticulous owner, keep a Korean-parts supplier bookmarked, and it's genuinely rewarding; buy a neglected one and you'll be pushing it home before Christmas.

Pros

+Genuine sportsbike proportions and presence
+Smooth, rev-happy DOHC engine
+Improved suspension over Gen 1
+Comfortable highway cruising at 100 km/h

Cons

Lean carb tune needs immediate rejetting
Electrical gremlins, especially voltage regulator
Parts sourcing slow outside Korea
Best for: Style-conscious learners wanting real performance Skip if: You hate chasing electrical faults
2013–2018 Gen 3

Fuel injection option introduced on some markets, updated graphics, revised exhaust, modernised dash.

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Used Buyer Review

5.5/10
Best for
Style-conscious new riders on tight budgets

"Decent learner bike if you find a genuinely pampered example."

$800-$2,500 used

The Hyosung GT125 is one of those bikes that looks the part without quite playing it. Styled after the bigger GT650, it'll turn heads in a car park and fool nobody on the road. Build quality is the elephant in the room here — early Korean manufacturing wasn't exactly Honda-grade, and these bikes reflect that. Expect electrical gremlins, weeping fork seals, and carb issues if it's been sitting. The V-twin note is genuinely charming for a 125, and the riding position is sporty without being punishing on a new rider's wrists. Mechanically they're not complicated, parts availability has improved over the years, and a well-maintained example can be surprisingly reliable. The key word is maintained. Check service history obsessively. These bikes punish neglect harder than most. Compression test before buying, check the cooling system hasn't been ignored, and wiggle every connector you can find. Buy a rough one cheap and you'll spend more fixing it than you saved.

Pros
Cons
Skip if: You want Japanese reliability without the fuss

Top 10 Accessories

Curated picks for the Hyosung Gt125 — owned, ridden, recommended.

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Common Problems

🔥 2 CRITICAL
⚠️Carburetor clogging and poor idle MODERATE

Cold start behavior, idle stability, throttle response

Fix cost: $30-$80
🔥Rectifier/regulator failure kills battery SERIOUS

Battery voltage at idle, dim lights, repeated dead battery

Fix cost: $40-$120
⚠️Fork seal leaks and worn suspension MODERATE

Oil residue on fork legs, soft or bouncy front end

Fix cost: $60-$150
🔥Cam chain tensioner noise and wear SERIOUS

Rattling on startup, timing chain noise at idle

Fix cost: $50-$200

Pre-Purchase Checklist

Start cold, listen for rattles
Check fork legs for oil residue
Test battery charge at idle
Inspect coolant for oil contamination

Decent budget bike, needs attentive maintenance

Full Specifications

Engine Power 14 hp @ 10,000 rpm
Torque 11 Nm @ 8,500 rpm
Top Speed 110 km/h
Weight 149 kg (wet/curb weight)
Fuel Consumption 3.5 L/100km or ~28.5 km/L (typical real-world average)
Type Sport
Fairing Full/Partial Fairing

Rivals & Alternatives

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Compare Hyosung Gt125 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 Hyosung Gt125? +

Carburetor clogging and poor idle: Cold start behavior, idle stability, throttle response (moderate) | Rectifier/regulator failure kills battery: Battery voltage at idle, dim lights, repeated dead battery (serious) | Fork seal leaks and worn suspension: Oil residue on fork legs, soft or bouncy front end (moderate)

Is the Hyosung Gt125 a good motorcycle? +

Decent learner bike if you find a genuinely pampered example. Rating: 5.5/10. Best for: Style-conscious new riders on tight budgets. Avoid if: You want Japanese reliability without the fuss.

What is the horsepower of the Hyosung Gt125? +

The Hyosung Gt125 produces 14 hp @ 10,000 rpm, with 11 Nm @ 8,500 rpm of torque. Top speed: 110 km/h.

Is the Hyosung Gt125 good for beginners? +

Yes — the Hyosung Gt125 is a reasonable choice for new riders (14 hp is manageable), weighing 149 kg. Style-conscious new riders on tight budgets

Is the Hyosung Gt125 reliable? +

Owners report 2 critical issues to watch for on the Hyosung Gt125, notably: Rectifier/regulator failure kills battery (Battery voltage at idle, dim lights, repeated dead battery). Buy with a pre-purchase inspection.

Is the Hyosung Gt125 good for daily use? +

Style-conscious new riders on tight budgets Fuel: 3.5 L/100km or ~28.5 km/L (typical real-world average).

How fast is the Hyosung Gt125? +

The Hyosung Gt125 reaches a top speed of 110 km/h, producing 14 hp at 149 kg curb weight. Real-world performance depends on rider weight, gearing, and road conditions.

What gear should I buy for a Hyosung Gt125? +

Motoryk has curated a Top 10 gear list specifically for the Hyosung Gt125, covering engine oil, tires, chain, battery, and brake pads — see motoryk.com/bikes/hyosung/gt125/top10. Each pick is matched to this bike's spec.