Suzuki RV 125 (1977-1981) Review: The Uncomplicated Charm of a Two-Stroke Legend

Introduction

The Suzuki RV 125 represents an era when motorcycles were defined by simplicity, reliability, and pure mechanical joy. Produced between 1977 and 1981, this air-cooled two-stroke machine carved its niche as a lightweight commuter that prioritized function over frills. While modern riders might overlook its modest specs, the RV 125 offers a riding experience that feels refreshingly raw in today's world of digital dashboards and ride-by-wire throttles. Let's explore why this unassuming Japanese workhorse remains a cult favorite among vintage enthusiasts and practical riders alike.

Design & Styling

The RV 125's design philosophy screams "no-nonsense." Its pressed-steel frame houses a compact 123cc engine, while the flat bench seat and high-rise handlebars create an upright riding position perfect for urban commuting. The chrome fenders and minimalist bodywork (available in classic Suzuki blues and reds) give it a timeless appeal that still turns heads at café meetups.

Weighing just 110 kg (243 lbs), the bike feels almost bicycle-light when pushing it off the stand. The 18-inch spoked wheels with narrow tires (2.50-18 front/rear) contribute to its flickable nature, though the 0.8 bar (11.6 psi) tire pressure recommendation requires careful monitoring for optimal grip.

Engine & Performance

At its heart lies a single-cylinder two-stroke engine displacing 123cc. The 8 PS (5.9 kW) output might seem laughable by modern standards, but the power delivery tells a different story. With peak torque arriving low in the rev range, the RV 125 pulls eagerly from standstill to its 90 km/h (56 mph) top speed. The engine's distinctive two-stroke buzz—a mix of metallic chatter and exhaust bark—becomes addictive, especially when wringing out the 5-speed gearbox through winding roads.

Fuel economy stands out as a strong suit. The 5.5-liter (1.45-gallon) tank delivers about 250 km (155 miles) of range, translating to an impressive 2.2 L/100km (107 mpg). However, the two-stroke design requires meticulous oil mixing (no separate lubrication system), and that NGK B7HS spark plug needs frequent checking given the 0.6 mm electrode gap specification.

On the Road Experience

Throwing a leg over the RV 125 immediately reveals its purpose. The seat height sits at a accessible 780 mm (30.7 inches), welcoming riders of all sizes. Fire up the engine with a confident kick, and you're greeted by that signature two-stroke smoke cloud—a ritual that never gets old.

In city traffic, the bike shines. The 15/51 sprocket combination provides snappy acceleration off the line, easily keeping pace with urban traffic up to 60 km/h (37 mph). The mechanical drum brakes require deliberate input, teaching riders the lost art of anticipation. Out on open roads, the engine settles into a happy cruise at 70 km/h (43 mph), though sustained high-speed runs reveal the limitations of the rudimentary suspension—those 125 ml of SAE 10W-30 fork oil per leg only go so far in absorbing bumps.

Competition

In its heyday, the RV 125 faced fierce competition:

1. Honda CB125 S (1976-1983):
   The four-stroke CB125 offered smoother power delivery and quieter operation but weighed 15 kg (33 lbs) more. While Honda's build quality was superior, the Suzuki's simpler two-stroke design meant easier home maintenance.

2. Yamaha DT125 (1974-1984):
   Yamaha's enduro-focused DT125 shared the same displacement but featured longer-travel suspension and knobby tires. The RV 125's road-oriented setup made it better for daily commuting, while the DT appealed to weekend trail riders.

3. Kawasaki KH125 (1976-1979):
   Kawasaki's rival had a slight power advantage (12.5 PS vs 8 PS) but suffered from complex rotary valve maintenance. The Suzuki's straightforward piston-port design proved more reliable for casual riders.

Maintenance & Ownership

The RV 125 thrives on neglect but rewards attentive care. Key considerations:

• Two-Stroke Simplicity: With no valves to adjust (just piston port timing), basic maintenance revolves around the 550 ml (18.6 oz) gearbox oil changes and air filter cleaning. Always use JASO-FB certified two-stroke oil at a 25:1 mix ratio.

• Ignition Care: The dual NGK spark plugs (B7HS standard/BR7HIX iridium alternative) require regular gapping. Upgrade to a modern electronic ignition for more consistent starts.

• Chain Discipline: The 108-link drive chain needs frequent adjustment given the 15/51 sprocket combo. Consider upgrading to an O-ring chain for longer service intervals.

• Brake Attention: Mechanical drum brakes demand cable lubrication and shoe inspection every 3,000 km (1,864 miles). MOTOPARTS.store offers sintered brake shoes for improved stopping power.

• Vintage Parts: While major components remain available, items like the 108-link chain and 15T front sprocket should be kept in stock by serious owners.

Conclusion

The Suzuki RV 125 isn't about spec sheet bragging rights—it's about rediscovering motorcycling's elemental joys. That light clutch pull, the mechanical feedback through handlebars, and the satisfaction of mastering two-stroke maintenance create a connection modern bikes often lack. While not without flaws (we're looking at you, vibration-heavy highway rides), its charm lies in doing so much with so little.

For MOTOPARTS.store customers, this bike represents a perfect platform for upgrades. Consider our premium two-stroke oils for cleaner combustion, retro-style mirrors to complete the vintage look, or a quality chain kit to smooth out power delivery. Whether you're keeping one stock or modifying it into a café racer, the RV 125 remains a blank canvas for riding passion.

Specifications sheet