AJP PR3 125 (2016-2021): A Pocket-Sized Off-Road Warrior Tested

Introduction

The AJP PR3 125 represents Portugal’s passionate answer to the lightweight enduro and supermoto segments. Produced from 2016 to 2021, this nimble machine caters to riders seeking an accessible yet capable off-road companion or a flickable urban supermoto. With its punchy 125cc engine, adjustable suspension, and rugged composite frame, the PR3 125 punches above its weight class. After spending a day wrestling it through muddy trails and testing its supermoto variant on twisty asphalt, here’s why this underdog deserves your attention.

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Riding Experience: Where the PR3 125 Shines

Engine Performance: Small Bore, Big Personality

At the heart of the PR3 125 lies an air-cooled, single-cylinder four-stroke engine displacing 124cc. While its 12.5 HP (9.1 kW) peak power at 12,600 RPM and 8.5 Nm (6.3 lb-ft) torque at 8,000 RPM won’t intimidate liter bikes, it’s precisely tuned for technical terrain. The carbureted 30mm fuel system delivers crisp throttle response, though it demands patience in cold starts.

On trails, the engine’s high-revving character encourages aggressive clutch work. The 5-speed gearbox shifts smoothly, with a ratios favoring low-speed control (1st gear crawls at walking pace) and a 5th gear that hums comfortably at 80 km/h (50 mph). For supermoto variants, the slightly retuned 12.6 HP at 8,500 RPM offers better mid-range pull for street riding.

Chassis and Suspension: Precision in the Dirt

Weighing just 104 kg (229 lbs) wet, the PR3 125 feels like lifting a mountain bike. The composite aluminum/steel frame balances rigidity and flex, absorbing impacts without numbing feedback.

• Front Suspension: AJP’s fully adjustable 38mm fork serves up 240mm (9.4") of travel. Dialed in for intermediate terrain, it soaks up rocks and roots without bottoming out.
• Rear Suspension: The Ollé progressive system (or ZF Sachs on Pro models) offers 280mm (11") of travel. Preload and rebound adjustments let riders tailor it for everything from motocross jumps to endurance trails.

Ground clearance of 310mm (12.2") lets you straddle logs effortlessly, while the 840mm (33.1") seat height accommodates taller riders without intimidating beginners.

Braking and Tires

• Enduro Models: 2.75-19 front and 3.25-17 (or 100/100-17) knobby tires claw through mud. The 220mm front disc with a 2-piston caliper provides ample stopping power, though the rear brake lacks initial bite.
• Supermoto Variants: 100/80-17 front and 130/70-17 street tires offer surprising grip. The upgraded 2-piston rear caliper on later models enhances corner stability.

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Design and Build Quality: Rugged Simplicity

The PR3 125’s no-frills design prioritizes function. The angular bodywork in white/red/grey schemes (or black/red for Pro models) hides a durable steel subframe. Wire-spoked wheels withstand hard impacts, though the 17"/19" combo on enduro models feels dated compared to modern 18"/21" setups.

The cockpit is minimalist: a digital speedometer, basic indicator lights, and a handlebar bend that suits standing riding. While the seat’s foam is firm for all-day comfort, it’s a trade-off for better control during aggressive maneuvers.

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Competition: How the PR3 125 Stacks Up

Off-Road Rivals

1. Yamaha WR125R: With fuel injection and 15 HP, the Yamaha outpowers the AJP but weighs 18 kg (40 lbs) more. The PR3’s suspension adjustability gives it an edge in technical sections.
2. Honda CRF125F: A lower-spec trail bike with non-adjustable suspension. The AJP appeals to serious riders willing to tweak their setup.
3. Beta RR 125 2T: The Beta’s 2-stroke engine delivers more explosive power but demands frequent rebuilds. The AJP’s 4-stroke reliability wins for endurance rides.

Supermoto Contenders

1. KTM 125 Duke: Street-focused with premium components, but lacks the AJP’s off-road DNA.
2. Aprilia SX 125: A 2-stroke rocketship, yet high maintenance costs deter budget-conscious riders.

Verdict: The PR3 125 carves a niche with its balance of affordability, adjustability, and dual-sport versatility. It’s a parts-bin special done right.

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Maintenance: Keeping Your PR3 125 in Fighting Shape

Key Considerations

1. Air-Cooled Simplicity: No radiators to damage, but monitor oil temps during sustained high-RPM runs. Use JASO MA2-certified 10W-40 oil.
2. Carburetor Care: Clean the 30mm carb every 3,000 km (1,864 miles). Consider upgrading to a JD Jet Kit for altitude adjustments.
3. Chain & Sprockets: The O-ring chain lasts 8,000–10,000 km (4,970–6,214 miles) with regular lubrication. Swap to a steel rear sprocket for longevity.
4. Brake Upgrades: MOTOPARTS.store offers sintered pads for improved bite and braided lines to reduce lever fade.
5. Suspension Service: Rebuild forks every 100 hours of hard off-road use. The Ollé shock benefits from periodic nitrogen recharges.

Recommended MOTOPARTS.store Upgrades

• Air Filter: Twin Air foam filter for better airflow and dust trapping.
• Handguards: Acerbis X-Factor guards to protect levers in crashes.
• Exhaust: FMF Power Core 4 slip-on (supermoto models) for weight savings and a throatier note.

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Final Impressions

The AJP PR3 125 isn’t about brute force—it’s a masterclass in balance. Beginners appreciate its forgiving nature, while experts exploit its tunable suspension and featherweight agility. Whether you’re threading through single-track trails or scraping pegs on backroads, this Portuguese underdog delivers grins per euro like few others. And when it’s time to tweak, MOTOPARTS.store has the upgrades to make it truly yours.

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Specifications sheet

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