GAS GAS EC 125 Racing (2010-2016): A Two-Stroke Enduro Legend Revisited

Introduction

The GAS GAS EC 125 Racing, produced between 2010 and 2016, remains a cult favorite among hardcore enduro enthusiasts. As part of the Spanish brand’s off-road lineage, this two-stroke machine carved its niche with a blend of agility, raw power, and race-ready components. While modern bikes increasingly favor four-stroke engines, the EC 125 Racing’s shrill two-stroke scream and minimalist design evoke a purist’s thrill that’s hard to replicate. After spending time with this machine on rocky trails and forest tracks, it’s clear why it still commands respect in the used-bike market.

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Engine Performance: Two-Stroke Simplicity Meets Precision

At the heart of the EC 125 Racing lies a 124 cc liquid-cooled single-cylinder two-stroke engine, paired with a Keihin PWK 38 mm carburetor. The setup delivers a classic two-stroke powerband—forgiving at low RPMs but explosive once the revs climb past the midrange.

• Power Delivery: The engine’s character is unapologetically old-school. Below 6,000 RPM, it chugs along amiably, making it manageable for technical climbs. But twist the throttle past halfway, and the VForce 3 reed valve snaps to attention, unleashing a surge of power that catapults the bike forward. This "light switch" burst isn’t for beginners, but seasoned riders will relish the adrenaline rush.
• Gearbox: The 6-speed transmission is crisp and well-spaced. First gear is short enough for crawling over boulders, while sixth gear lets the bike stretch its legs on fire roads (though it’s still happiest at 80-85 km/h / 50-53 mph). Clutch action via the hydraulic wet multiplate clutch is featherlight, a boon during long off-road sections.
• Fuel Mix: The 1:50 oil-to-fuel ratio means frequent mixing, but it’s a small price for the engine’s simplicity. Just avoid ethanol-blended fuels to protect the carburetor.

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Handling and Suspension: Where the EC 125 Racing Truly Shines

Weighing in at 94–96 kg (207–212 lbs) dry, the GAS GAS feels almost telepathic in tight terrain. The chromoly perimeter frame strikes a balance between stiffness and flex, offering precise feedback without the arm-jarring rigidity of some competitors.

• Front Suspension: The Marzocchi Shiver 45 mm inverted fork (with adjustable compression/rebound on later models) soaks up roots and rocks effortlessly. Even at full lean into rutted corners, the front end stays planted.
• Rear Suspension: Early models used a Reiger shock, while 2011+ bikes switched to Öhlins. Both units provide 298–310 mm (11.7–12.2 in) of travel, tuned for progressive resistance. The rear tracks beautifully over whoops, though heavier riders might want to stiffen the preload.
• Brakes: The dual Galfer wave discs up front (with 2-piston calipers) offer strong initial bite, while the rear 220 mm disc provides ample modulation for slides. Brake feel is more "analog" than modern setups—reliant on rider skill rather than ABS aids.

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Ergonomics: Built for Aggressive Riding

The EC 125 Racing’s 950 mm (37.4 in) seat height and narrow chassis let riders shift weight effortlessly. Standing up on the pegs feels natural, thanks to a 1480 mm (58.3 in) wheelbase that splits the difference between stability and flickability.

• Riding Position: The bars are positioned for attack-mode riding—leaning slightly forward but not cramped. Footpegs are set high to avoid snagging on debris, which might bother taller riders during long sits.
• Fuel Capacity: At 9.5 liters (2.5 gallons), range is limited to ~100 km (62 miles) under hard riding. Pack extra fuel for all-day adventures.

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Competition: How It Stacks Up

The EC 125 Racing faced fierce rivals in the 125cc enduro segment. Here’s how it compared:

1. KTM 125 EXC (2010–2016):
   KTM’s flagship two-stroke had a sharper powerband and lighter feel (92 kg dry). However, the GAS GAS countered with plusher suspension and a more durable chromoly frame. KTM’s parts network was broader, but GAS GAS appealed to riders valuing stability over outright speed.

2. Husqvarna WR 125:
   Similar weight and engine specs, but the Husky’s Kayaba suspension was softer, favoring technical trails over high-speed runs. The EC 125’s Marzocchi/Öhlins combo struck a better balance for mixed terrain.

3. Yamaha WR125X:
   Yamaha’s four-stroke entry was quieter and more fuel-efficient but lacked the explosive power-to-weight ratio of the GAS GAS. A better commuter, but not a true enduro rival.

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Maintenance: Keeping the Two-Stroke Spirit Alive

The EC 125 Racing rewards diligent owners. Key considerations:

• Top-End Rebuilds: Two-strokes demand frequent piston replacements—every 50–80 hours for aggressive riders. MOTOPARTS.store offers aftermarket forged pistons for extended durability.
• Carburetor Tuning: The Keihin PWK 38 mm carb is reliable but sensitive to altitude changes. Keep jets clean and consider a JD Jet Kit for smoother throttle response.
• Suspension Service: Rebuild forks/shocks annually if ridden hard. Upgrade to synthetic oil for consistent damping in extreme temps.
• Exhaust Upgrades: A DEP or FMF expansion pipe boosts midrange torque, complementing the VForce reed valve.

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Conclusion: A Timeless Off-Road Weapon

The GAS GAS EC 125 Racing isn’t a bike for everyone. It demands skill to master and patience to maintain. But for riders who crave the raw, unfiltered thrill of a two-stroke—paired with top-shelf suspension and race-bred geometry—it’s a masterpiece. Whether you’re resurrecting a neglected 2010 model or upgrading a 2016 gem, MOTOPARTS.store has the expertise and parts to keep your EC 125 shredding trails for years to come.

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Specifications sheet

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