GAS GAS TXT 125 [2016 - 2022]: A Trials Machine Built for Precision and Agility

Introduction

The GAS GAS TXT 125, produced between 2016 and 2022, represents a golden era for lightweight trials motorcycles. Designed in Spain—a country synonymous with trials mastery—this bike blends razor-sharp agility with the raw, unfiltered character of a two-stroke engine. Whether you’re navigating rocky outcrops, balancing on narrow logs, or tackling steep inclines, the TXT 125 feels less like a machine and more like an extension of the rider’s instincts. After spending a day throwing this bike around a technical trials course, one thing becomes clear: it’s a specialist tool crafted for riders who demand precision above all else.

At first glance, the TXT 125’s minimalist design hides its sophistication. The red/white/black color scheme (with occasional carbon fiber accents on limited editions) screams competition readiness, while its compact dimensions—2,010 mm (79.1 inches) in length and a featherlight 65–67 kg (143–148 lbs) dry weight—make it almost disappear beneath you. But the real magic happens when you kickstart that liquid-cooled 125cc engine and feel the immediacy of its power delivery.

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Engine Performance: Two-Stroke Thrills, Trials Refinement

The heart of the TXT 125 is its 124.8cc single-cylinder two-stroke engine, a configuration beloved in trials for its explosive low-end torque and simplicity. With a bore and stroke of 54.0 x 54.5 mm (2.1 x 2.1 inches), this engine prioritizes quick-revving responsiveness over top-speed bravado. The reed-valve induction system ensures crisp throttle response, while models equipped with the Keihin PWK 28 or Dell’Orto PHBL26BS carburetors deliver a satisfyingly raw connection between your wrist and the rear wheel.

Later models (2021–2022) experimented with fuel injection, offering smoother low-RPM control—a boon for beginners—but purists will argue the carbureted versions provide more "feel" for advanced riders. The HIDRIA double-spark CDI ignition system deserves praise for its reliability, ensuring consistent performance even in wet conditions.

Power delivery is linear but urgent, with a narrow powerband typical of trials-focused two-strokes. You’ll rarely rev this engine past mid-range; instead, it thrives on short, controlled bursts of acceleration to hop over obstacles or correct balance. The 6-speed gearbox is slick and precise, though you’ll spend most of your time in 1st or 2nd gear during technical sections.

One quirk? The 2.4–2.5-liter (0.63–0.66 US gal) fuel tank. It’s comically small by conventional standards but perfectly adequate for a discipline where rides rarely exceed 50 km (31 miles). Just remember to mix your fuel at 1:50 (2% oil) for older models or 2.5% for newer variants—this engine won’t tolerate neglect.

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Chassis and Suspension: Lightweight, Adjustable, and Resilient

The TXT 125’s chromoly steel tubular frame is a masterpiece of minimalist engineering. Weighing just 65–67 kg (143–148 lbs) dry, the bike feels almost weightless when lifted or pivoted mid-obstacle. The 1,320 mm (52-inch) wheelbase and low seat height of 630 mm (24.8 inches) create a centered, confidence-inspiring stance—critical when you’re teetering on the edge of a boulder.

Suspension components evolved slightly over the years. Early models (2016–2018) used TECH front forks with 39 mm aluminum legs, offering rebound, compression, and preload adjustment. Later iterations added Öhlins or Reiger rear shocks, which transformed the bike’s ability to absorb hard landings. With 167–180 mm (6.6–7.1 inches) of front travel and 164–174 mm (6.5–6.9 inches) at the rear, the TXT 125 floats over jagged terrain while remaining firm enough for precise control.

The BRAKTEC braking system is a highlight. The 4-piston front caliper grips a NG WAVE floating disc, delivering progressive bite without the abruptness that could send you over the bars. Rear brakes use a smaller 2-piston caliper, ideal for feathering speed during delicate maneuvers.

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Handling and Ergonomics: Where the TXT 125 Shines

Trials riding is about finesse, and the TXT 125’s ergonomics are tailored to that philosophy. The narrow aluminum handlebar (often wrapped in Renthal grips) allows sharp steering inputs, while the pegs are positioned for optimal weight distribution. Standing up feels natural, thanks to the bike’s 325 mm (12.8-inch) ground clearance and balanced chassis.

The 2.75-21 front and 4.00-18 rear tires (often Michelin or Dunlop trials-specific rubber) provide tenacious grip on everything from wet rocks to loose gravel. Combine this with the bike’s absurdly low weight, and you’ve got a machine that forgives mistakes and rewards bold lines.

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Competition: How Does It Stack Up?

The TXT 125’s fiercest rivals include the Beta Evo 125, Sherco ST 125, and Montesa Cota 4RT125. Here’s how GAS GAS holds up:

• Beta Evo 125: Slightly heavier at ~68 kg (150 lbs), but praised for its smoother power delivery. The Beta’s Sachs suspension lacks the adjustability of GAS GAS’s TECH/Öhlins setups.
• Sherco ST 125: Shares similar geometry but uses a Sherco-designed engine with a wider powerband. However, the Sherco’s parts network isn’t as robust as GAS GAS’s.
• Montesa Cota 4RT125: A four-stroke outlier. Quieter and fuel-injected, but heavier (72 kg/159 lbs) and less "flickable" than the TXT 125.

The GAS GAS distinguishes itself with its adjustable suspension, lighter weight, and aggressive pricing in the used market. It’s a favorite among riders who value customization and raw two-stroke character.

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Maintenance: Keeping Your TXT 125 in Peak Condition

Ownership rewards those who stay proactive:
1. Chain Care: The 520-size chain needs regular cleaning and lubrication—trials riding is brutal on drivetrains.
2. Air Filter: Clean after every muddy ride. Consider upgrading to a Twin Air filter for better airflow.
3. Brake Pads: BRAKTEC pads wear quickly under hard use. Keep spares handy.
4. Suspension: Rebuild forks/shocks annually if ridden competitively. MOTOPARTS.store offers Öhlins rebuild kits.
5. Premix Fuel: Stick to the manufacturer’s oil ratio. A mismix could seize the engine.

For upgrades, explore:
- High-performance clutch plates for smoother modulation.
- Carbon fiber skid plates to protect the frame.
- Adjustable handlebar risers for personalized ergonomics.

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Final Thoughts

The GAS GAS TXT 125 isn’t just a motorcycle—it’s a gateway to mastering one of motorsport’s most demanding disciplines. Its blend of lightweight construction, adjustable suspension, and visceral two-stroke power makes it a standout in the 125cc trials segment. Whether you’re a novice honing your skills or a veteran chasing podium finishes, this bike adapts to your ambition. And when it’s time for repairs or upgrades, MOTOPARTS.store has the expertise and inventory to keep your GAS GAS fighting fit.

Now, go find some rocks to conquer.

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Specifications sheet

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