Gas Gas EC 125 (2008–2011): A Two-Stroke Enduro Legend Revisited

Introduction

The Gas Gas EC 125, produced between 2008 and 2011, remains a cult favorite among hardcore enduro enthusiasts. As part of the Spanish brand’s off-road lineage, this lightweight two-strike warrior was designed to dominate technical trails, scramble up rocky inclines, and carve through forest single-tracks with the agility of a mountain goat. While modern four-strokes have taken over much of the enduro world, the EC 125’s raw power delivery, minimalist design, and race-bred DNA keep it relevant for riders who crave that classic two-stroke thrill. After spending a day wrestling this machine through muddy ravines and loose hill climbs, it’s clear why this generation of the EC 125 still has a devoted following.

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Design & Ergonomics: Built for the Dirt

The Gas Gas EC 125’s no-nonsense design prioritizes function over flair. The Deltabox frame, constructed from chromium-molybdenum steel tubing, strikes a balance between rigidity and flex, providing a solid backbone for aggressive riding. Paired with an aluminum swingarm, the chassis feels remarkably light at 95 kg (209 lbs) dry, making it easy to flick sideways or loft the front wheel over obstacles.

The riding position is pure enduro: upright bars, a narrow seat (940 mm / 37” tall), and pegs set slightly rearward for optimal standing control. Even at 5’8”, I found the seat height manageable thanks to the bike’s slim profile—a blessing when dabbing a foot on uneven terrain. The Six-Days editions (2009–2011) add race-ready touches like gripper seat covers and bold graphics, but even base models ooze purpose.

Suspension components are where the EC 125 shines. The 45mm Marzocchi upside-down forks (295 mm / 11.6” travel) and Öhlins rear shock (320 mm / 12.6” travel) are plush yet progressive, swallowing square-edged roots without bottoming out. Adjustability is limited compared to modern setups, but the stock tuning works brilliantly for riders weighing 65–85 kg (143–187 lbs).

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Engine & Performance: Two-Stroke Fury

At the heart of the EC 125 lies a 124cc liquid-cooled two-stroke engine that’s both a blessing and a beast. With 36.8 hp peaking at 10,000 rpm and a meaty 25 Nm (18.6 lb-ft) of torque, this mill thrives in the mid-to-top rev range. The Keihin PWK 38mm carburetor delivers crisp throttle response, though it demands patience to jet correctly for altitude or temperature changes.

Starting is old-school: a firm kick through the lever (no electric start here) rewards you with a raspy exhaust note that’s music to any two-stroke lover’s ears. On tight trails, the powerband hits like a switch—soft off the bottom, then a violent surge from 6,000 rpm upward. It’s exhilarating but requires clutch finesse in technical sections. For slower riders, a flywheel weight or reed valve upgrade (available at MOTOPARTS.store) can tame the hit.

The six-speed gearbox is bulletproof, with a wide-ratio spread that tackles everything from crawling rock gardens to open fire roads. Sixth gear feels tall enough for short highway stints, though the EC 125’s natural habitat is unquestionably off-road.

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On-Road vs. Off-Road Manners

Let’s be clear: this isn’t a dual-sport. The EC 125’s 21” front and 18” rear wheels (shod with knobby tires) wobble nervously on pavement, and the lack of a cush drive makes street riding jarring. But point it toward a wooded trail, and the transformation is magical.

The bike’s 340 mm (13.4”) ground clearance lets you skate over logs and ruts without hesitation, while the 1475 mm (58.1”) wheelbase ensures stability at speed. Standing up through whoops, the EC 125 feels planted yet nimble, with the front tire tracking predictably even in loose dirt. The hydraulic clutch (standard on later models) offers buttery modulation—critical when feathering through slick roots or rocky ascents.

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Handling & Suspension: Precision Meets Toughness

Gas Gas nailed the geometry here. The Marzocchi forks provide excellent damping control, resisting dive under hard braking and staying composed during aggressive cornering. Out back, the Öhlins shock (upgraded on Six-Days models) keeps the rear wheel hooked up even when hammering through braking bumps.

At 95 kg (209 lbs), the EC 125 dances beneath you. Flicking it into tight switchbacks requires minimal effort, and the Nissin brakes (260mm front/220mm rear) offer strong, progressive stopping power. The Six-Days editions’ Galfer wave rotors add extra bite in muddy conditions—a worthwhile upgrade for serious racers.

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Competition: How Does It Stack Up?

In the 125cc enduro class, the EC 125 faced stiff rivals:

1. KTM 125 EXC (2008–2011):
   KTM’s offering matched the Gas Gas in power but weighed 4 kg (8.8 lbs) more. The Austrian bike had a broader powerband, thanks to its V-force reed system, but the EC 125’s suspension felt plusher on harsh terrain.

2. Husqvarna WR 125:
   Husky’s counterbalanced engine reduced vibrations, and its six-speed gearbox was smoother. However, the WR 125’s chassis wasn’t as agile, feeling bulkier in tight woods.

3. Yamaha YZ125 (MX version):
   The YZ125’s motocross DNA gave it a sharper hit and lighter feel, but it lacked the EC 125’s enduro-specific perks (lights, wider gear ratios, kickstand).

Verdict: The Gas Gas EC 125 carved its niche with superior suspension, a lighter frame, and a rabid two-stroke character. It’s less polished than the KTM but more rewarding for skilled riders.

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Maintenance: Keeping the Beast Alive

Two-strokes demand diligence, and the EC 125 is no exception. Key tips:

• Top-End Rebuilds: Plan for piston replacements every 40–50 hours of hard riding. MOTOPARTS.store stocks OEM-style kits or high-compression aftermarket pistons for racers.
• Carb Tuning: The Keihin PWK thrives with regular cleaning. Consider a JD Jet Kit for simplified tuning.
• Air Filter Care: Foam filters clog quickly in dust. Swap in a twin-air filter and grease the rim to prevent debris ingress.
• Suspension Service: Rebuild forks and shock annually. Upgrade to synthetic oil for consistent damping.
• Chain & Sprockets: The O-ring chain lasts longer, but a lightweight DID chain (available in our store) reduces rotational mass for snappier acceleration.

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Conclusion: A Timeless Trail Weapon

The Gas Gas EC 125 (2008–2011) isn’t for the faint of heart. It’s a raw, unapologetic two-stroke that rewards skill and punishes laziness. Yet, for those willing to master its quirks, few bikes deliver such visceral excitement off-road. Whether you’re resurrecting a tired example or optimizing a Six-Days gem, MOTOPARTS.store has the upgrades to keep this Spanish legend shredding trails for years to come.

Ready to revive your Gas Gas EC 125? Explore our curated selection of performance parts, tools, and accessories tailored for enduro warriors.

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Specifications sheet

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