Gas Gas TXT 125 [1999-2010]: A Trials Machine That Rewrites the Rules

Introduction

The Gas Gas TXT 125 isn’t just a motorcycle—it’s a declaration of intent. Designed for the vertical ascents, rock gardens, and technical ballet of trials riding, this Spanish-born machine carved its niche as a lightweight, precision-focused tool for riders who demand absolute control. Over its 11-year production run, the TXT 125 evolved subtly but retained its core identity: a two-stroke powerhouse wrapped in minimalist engineering. Having recently thrown a leg over a well-preserved 2008 model, I can confirm this bike’s reputation isn’t just nostalgia—it’s earned.

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Engine Performance: Two-Stroke Finesse

At the heart of the TXT 125 lies a 124.8 cc liquid-cooled two-stroke engine, a configuration that’s become increasingly rare in today’s emissions-conscious world. The moment you kickstart the bike (yes, it’s kick-only—no electric leg here), the sharp bark from the exhaust signals readiness. Throttle response is immediate but manageable, thanks to the Dell’Orto PHBHL 26 BS carburetor. This isn’t a wild motocross engine; it’s tuned for low-end torque and mid-range punch, perfect for crawling over obstacles or lofting the front wheel onto a boulder.

The six-speed gearbox is a standout. Shifts click with rifle-bolt precision, and the hydraulic clutch (a Gas Gas-patented design on later models) offers buttery modulation. You’ll appreciate this when balancing on a narrow ledge—the clutch isn’t just a lever; it’s your third hand.

Metric/Imperial Note:
- Displacement: 124.8 cc (7.62 cubic inches)
- Power: While exact figures vary, expect ~24-26 HP—enough to challenge experts but forgiving for learners.

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Chassis & Handling: Where Featherweight Meets Brutal Strength

Weighing between 63-69 kg (139-152 lbs) depending on the year, the TXT 125 feels almost disrespectfully light. Lift it off the stand, and it’s like hoisting a mountain bike. The chromium-molybdenum frame—elliptical in profile on later models—combines rigidity with just enough flex to absorb impacts without unsettling the rider.

Suspension Setup:
- Front: Marzocchi 38-40 mm adjustable telescopic forks (depending on model year) soak up everything from sharp rocks to failed splatters.
- Rear: A Sachs shock with progressive linkage keeps the rear wheel tracking precisely, even during awkward pivots.

Braking: Single AJP discs front and rear (2-piston rear, 4-piston front) offer stoic performance. They’re not for hauling down from highway speeds, but for trials? Perfect. Modulate with one finger, and the bike obeys.

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Ergonomics: Built for the Dance

Trials bikes aren’t about comfort—they’re about control. The TXT 125’s 665 mm (26.2-inch) seat height (on most models) positions you high enough for leg-saving dab maneuvers but low enough to plant boots on uneven terrain. The narrow fuel tank (3-5 liters / 0.79-1.32 gallons) and absent bodywork let you grip the bike with your knees like a vice.

Standing up, the bars fall naturally to hand, and the pegs—positioned for optimal weight distribution—feel like extensions of your feet. After an hour of practicing log hops, you’ll forget you’re riding a motorcycle; it becomes a prosthetic for creative movement.

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Competition: How the TXT 125 Stacks Up

The trials world in the 2000s was dominated by three key rivals:

1. Beta Rev 3 125:
2. Lighter at ~63 kg (139 lbs) but with a snappier powerband that demands finesse.
3. Sachs suspension vs. Gas Gas’ Marzocchi/Sachs combo—subjective, but Gas Gas edges on mid-stroke support.

4. Beta’s cable clutch feels agricultural next to Gas Gas’ hydraulic system.

5. Sherco 125:

6. Similar weight class but with a mellower low-end. Better for beginners, less thrilling for experts.

7. Sherco’s frame geometry favors stability over quick direction changes.

8. Montesa Cota 125:

9. Honda’s four-stroke engine (post-2005) offers smoother power but lacks the two-stroke’s explosive hit.
10. Heavier at ~72 kg (159 lbs)—a dealbreaker in tight sections.

Verdict: The TXT 125 strikes a middle ground—approachable for novices yet capable enough to keep experts engaged. Its hydraulic clutch and Marzocchi/Sachs suspension package give it a premium edge in its era.

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Maintenance: Keeping the Spanish Stallion Alive

1. Two-Stroke Care:
- Oil Mix: Use a high-quality synthetic at 2.5% (50:1). Stihl HP Ultra or Motorex Cross Power 2T are excellent.
- Carb Tuning: The Dell’Orto 26 mm carb is reliable but sensitive to altitude changes. Keep spare jets if riding in mountainous areas.

2. Clutch Health:
- Later models’ hydraulic systems rarely bleed but check fluid levels annually.
- Replace friction discs every 80-100 hours for buttery engagement.

3. Suspension Refresh:
- Fork seals last ~2 seasons with moderate use. Upgrade to SKF seals for longevity.
- Sachs shock rebuilds are straightforward—replace bladder every 150 hours.

4. Critical Upgrades from MOTOPARTS.store:
- Tubliss Tire System: Run lower pressures without pinch flats.
- Brake Pads: Swap OEM for sintered metal pads in muddy conditions.
- Handguards: Acerbis Rally Pro guards protect levers in rocky drops.

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The Verdict: Timeless Trials DNA

The Gas Gas TXT 125 isn’t just a relic—it’s a living lesson in how specialization breeds excellence. While modern trials bikes have leaned into fuel injection and carbon fiber, the TXT 125’s simplicity is its strength. It’s a bike that rewards skill, punishes haste, and forgives the occasional tumble. Whether you’re restoring a 1999 original or upgrading a 2010 model with modern touches, this machine remains a canvas for riders who believe motorcycles should be danced with, not just ridden.

Explore our curated selection of Gas Gas TXT 125 upgrades and OEM replacements at MOTOPARTS.store—where every component is a step toward mastery.

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Specifikacijų lentelė

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