Yamaha TZR 50 (1992-2016): A Two-Stroke Sport Moped Legacy

Introduction

For over two decades, the Yamaha TZR 50 carved its niche as the ultimate "gateway drug" to sportbike culture. Designed for riders aged 16-18 in European markets, this liquid-cooled two-stroke became a rite of passage for generations of motorcyclists. With its aggressive full-fairing design, clip-on handlebars, and a powerband that demanded mechanical sympathy, the TZR 50 wasn’t just transportation—it was a crash course in performance riding. Let’s dissect why this pocket rocket remains a cult favorite and how it holds up against modern competitors.

---

Design & Ergonomics

The TZR 50’s styling shamelessly aped its larger TZR250 sibling, complete with twin-headlight fairings and a stepped seat. From the 1992 debut to the 2016 finale, Yamaha offered color schemes like "Yamaha Blue/White," "Red/White/Black," and special editions like the 2012 WGP 50th Anniversary model with golden rims.

The 815mm (32.1") seat height caters to shorter riders, while the 1341mm (52.8") wheelbase strikes a balance between flickability and stability. Despite the sporty pretensions, the cockpit is surprisingly livable—the digital speedometer (added in later models) and analog tachometer are legible, though the PHBN 16 carburetor’s choke lever placement could baffle new riders.

---

Engine & Performance

The Heart of a Giant Killer

At its core lay a 49-50cc liquid-cooled two-stroke single, producing between 1.7-2.7 HP (1.3-2 kW) at 5,500-6,500 RPM. Torque figures hovered around 2.6-3 Nm (1.9-2.2 lb-ft), but the real story was in the power delivery.

Key Specs:
- Bore x Stroke: 40.3 x 39mm (1.6" x 1.5")
- Compression Ratio: 11.5:1
- Carburetor: Dell’Orto PHBN 16 (later models)
- Lubrication: Separate oil injection (Autolube/“Separate Lubrication”)

Riding the TZR 50 is a masterclass in momentum conservation. Below 5,000 RPM, it’s docile—perfect for urban crawling. But twist the throttle past 6,000 RPM, and the exhaust note sharpens as the powervalve opens, unleashing a narrow but addictive surge. The 5- or 6-speed gearbox (depending on year) requires constant rowing to stay “on the pipe,” making it feel faster than its 85-90 km/h (53-56 mph) top speed.

---

Handling & Braking

Yamaha nailed the geometry:
- Front Suspension: 130mm (5.1") travel telescopic forks
- Rear Suspension: Swingarm with 31mm (1.2") travel shock
- Tires: 100/80-17 front, 130/70-17 rear (commonly Michelin Pilot Street)

The 113-114kg (249-251 lb) dry weight vanishes mid-corner. On twisty backroads, the TZR 50 channels its RS125 ancestry—flickable, precise, and forgiving. However, the short suspension travel punishes poor surfaces.

Braking comes via 220mm (8.7") discs front/rear. Bite is adequate for the performance, though aftermarket sintered pads from MOTOPARTS.store can reduce lever effort.

---

Competition

In the 50cc sport moped arena, the TZR 50 faced:

1. Aprilia RS50
2. Similar two-stroke engine
3. More radical styling but fragile electrics

4. Lower parts availability today

5. Derbi GPR 50

6. 6-speed gearbox
7. Slightly sharper chassis

8. Prone to crankshaft issues

9. Honda NSR50

10. Rare four-stroke alternative
11. Bulletproof reliability but lethargic performance

Why Choose the TZR 50?
- Yamaha’s legendary reliability
- Liquid cooling reduced seizure risks
- Vast aftermarket support (e.g., Malossi kits)

---

Maintenance

Owning a TZR 50 is a mechanical apprenticeship. Key considerations:

1. Two-Stroke Upkeep

• Oil: Use JASO FC-certified injector oil. MOTOPARTS.store recommends Motul 710 for tuned engines.
• Premix: If bypassing Autolube, mix at 50:1 (2% oil).
• Spark Plugs: NGK BR9ES (standard) or BR9EIX (iridium). Gap at 0.8mm (0.031").

2. Carburetor Care

The PHBN 16 carb suffers from clogged jets if stored with ethanol fuel. Clean annually and consider a MOTOPARTS.store jet kit for altitude adjustments.

3. Cooling System

• Coolant: Replace every 2 years (700ml capacity).
• Thermostat: Check operation yearly to prevent overheating.

4. Transmission

• Chain: 132-link DID 428H chain. Adjust slack to 25-35mm (1-1.4").
• Sprockets: Stock 11/47 teeth. Swap to 12T front for better acceleration.

5. Brakes

• Fluid: DOT 4 every 2 years.
• Discs: Warping is common—upgrade to wave rotors.

MOTOPARTS.store Pro Tips:

• Install a temp gauge to monitor coolant health.
• Upgrade to a Mikuni VM18 carb for smoother response.

---

Conclusion

The Yamaha TZR 50 isn’t just a moped—it’s a microcosm of motorcycling’s visceral joys. From its stratospheric redline to the way it shrinks alpine passes into playgrounds, this bike taught a generation to ride with mechanical empathy. While modern 125cc four-strokes offer practicality, none replicate the TZR’s razor’s-edge thrill.

For owners, MOTOPARTS.store carries everything from OEM gaskets to race-spec expansion chambers. Keep the two-stroke dream alive—your future R6 will thank you.

---

Specifications sheet

---