GAS GAS TXT 300 [2015 - 2022]: A Trials Machine Forged in Precision

Introduction

The GAS GAS TXT 300 isn’t just a motorcycle—it’s a scalpel. Designed for the unforgiving world of trial riding, this Spanish-built machine balances raw two-stroke aggression with surgical precision. From 2015 to 2022, the TXT 300 evolved subtly, refining its formula without losing the visceral charm that makes it a favorite among riders who live for technical terrain. After spending a day wrestling this bike through rocky ravines and muddy creek beds, one thing is clear: the TXT 300 isn’t here to coddle you. It’s here to turn every obstacle into a playground.

Engine: Two-Stroke Soul, Modern Refinement

At the heart of the TXT 300 lies its 294.1 cc liquid-cooled two-stroke engine. The bore and stroke (79.0 mm x 60.0 mm / 3.1” x 2.4”) deliver a characteristically punchy low-end grunt, while the reed valve intake ensures crisp throttle response. Earlier models (2015–2020) use a Keihin PWK 28 carburetor, which offers a raw, analog feel—twist the throttle, and the bike snarls to life with an urgency that’s borderline addictive. By 2021, fuel injection arrived, smoothing out the power delivery without dulling the edge.

The difference? Carbureted models demand a rider’s intuition—a slight blip to clear hesitation—while the injected variants feel almost telepathic, pulling cleanly from idle. Both versions thrive on a 2.5% oil-premix diet, emitting that sweet, smoky aroma two-stroke aficionados crave. The 6-speed gearbox is faultlessly precise, though you’ll rarely venture beyond 3rd gear in trials use. Clutch action, via BRAKTEC’s hydraulic diaphragm system, is featherlight, allowing minute modulation during slow-speed pivots or sudden leaps over logs.

Chassis and Handling: Lightweight Agility Meets Adjustability

Weighing between 66.5–69.4 kg (146.6–153 lbs) dry, the TXT 300 feels like an extension of your body. The chromoly tubular frame is stiff yet forgiving, absorbing sharp impacts while communicating every pebble through the seat. Wheelbase remains consistent at 1,320 mm (52”), paired with a low seat height of 630–650 mm (24.8–25.6”)—ideal for quick foot dabs and repositioning mid-climb.

Suspension setups vary across years:
- Front: TECH forks (39 mm aluminum legs) dominate later models, adjustable for rebound, compression, and preload. Earlier editions occasionally feature Marzocchi 40 mm units, slightly plusher on initial stroke.
- Rear: Reiger or Öhlins shocks handle linkage-driven duties, with 150–185 mm (5.9–7.3”) of travel. Dial in more preload for aggressive rock gardens, or soften it for slippery ascents.

BRAKTEC brakes are a revelation. The front 4-piston monoblock caliper bites a NG WAVE floating disc with surgeon-like control, while the rear 2-piston setup includes an autostand system—genius for stabilizing the bike on inclines. Michelin Trial X11 tires (2.75-21” front, 4.00-18” rear) cling to surfaces like gecko feet, even when coated in slime.

Competition: How Does It Stack Up?

The trials segment is fiercely competitive, but the TXT 300 holds its own against:

1. Beta Evo 300
   Beta’s counterbalanced engine is smoother, but heavier at ~72 kg (158.7 lbs). The GAS GAS feels nimbler during abrupt direction changes, though Beta’s Sachs suspension is more plush over repeated hits.

2. Sherco ST 300
   Sherco’s chassis geometry favors stability, making it less flickable than the TXT 300. However, Sherco’s fuel injection (introduced earlier) feels marginally more refined in altitude changes.

3. Montesa Cota 300RR
   Montesa’s four-stroke is whisper-quiet and maintenance-light, but lacks the two-stroke’s explosive hit. Purists will prefer the GAS GAS’s character, even if it demands more mechanical sympathy.

The TXT 300’s ace? Adjustability. Few rivals offer this level of suspension and clutch tunability straight off the showroom floor.

Maintenance: Keeping the Beast Alive

Two-strokes live hard, and the TXT 300 is no exception. Key considerations:
- Top-End Rebuilds: Plan for piston replacements every 80–100 hours. Opt for forged pistons (available at MOTOPARTS.store) for longevity.
- Carburetor TLC: Clean the Keihin PWK 28 jetting monthly if ridden in muddy conditions. Injected models? Still check throttle body seals.
- Suspension Linkage: Grease bearings every 20 hours—trials riding is brutal on pivot points.
- Chain & Sprockets: The 520 chain lasts surprisingly long, but swap sprockets if hook engagement feels vague.

Pro tip: Upgrade to a billet clutch cover (we stock them) if rock strikes are frequent in your terrain.

Conclusion: A Rider’s Tool, Not a Garage Queen

The GAS GAS TXT 300 doesn’t care about comfort or curb appeal. It’s a machine built to conquer the impossible, one controlled explosion at a time. Whether you’re a weekend warrior or a seasoned competitor, this bike rewards skill and punishes complacency—exactly as a trials machine should. And when it’s time to rebuild, modify, or upgrade, MOTOPARTS.store has the parts to keep your TXT 300 biting at the edges of its limits.

Now go scratch that itch. The rocks are waiting.

Specifications sheet