Honda MSX 125 Grom [2017-2020]: A Pint-Sized Powerhouse That Defies Expectations
Introduction
The Honda MSX 125 Grom, sold globally as the Grom or MSX125, isn’t just a motorcycle—it’s a lifestyle. Introduced in 2014 and refined through its 2017-2020 iteration, this miniature marvel redefined urban motorcycling with its cheeky attitude, approachable design, and surprising capability. Whether you’re weaving through city traffic, customizing it into a pocket rocket, or simply using it as a gateway to two-wheeled freedom, the Grom has cemented itself as a cult classic. After spending a week with a 2019 model, it’s easy to see why this bike continues to charm riders across generations.
Design & Styling: Small Package, Big Personality
The Grom’s design is a masterclass in balancing playful aesthetics with functional minimalism. Its compact dimensions—1,760 mm (69.3 inches) long and a featherweight 103.9 kg (229 lbs)—make it look like a toy, but the execution is pure Honda: robust, clean, and detail-oriented. The steel mono-backbone frame gives it a muscular stance, while the inverted 31mm front fork and 12-inch cast aluminum wheels add a touch of sportbike aggression.
Color options evolved yearly, with highlights like Pearl White, Bright Yellow, and the head-turning Halloween Orange (2020). The 2019-2020 ABS models introduced subtle refinements, including sleeker LED headlights on certain trims and a redesigned LCD dash that’s surprisingly comprehensive for a bike this size. The seat height—ranging from 754 mm (29.7 inches) to 762 mm (30 inches)—is accessible for riders of all statures, though taller riders might feel a bit cramped during longer rides.
Engine & Performance: 125cc of Pure Joy
At the heart of the Grom lies a 124.9cc air-cooled single-cylinder engine, producing 9.7 HP @ 7,000 RPM and 10.9 Nm (8.0 lb-ft) of torque @ 5,500 RPM. On paper, these numbers seem modest, but the Grom’s magic lies in its delivery. The fuel-injected engine is eager, with a snappy throttle response that makes accelerating from 0-60 km/h (0-37 mph) an absolute hoot. The 4-speed transmission shifts smoothly, though the absence of a sixth gear limits highway viability—this is strictly a city/backroad warrior.
Fuel efficiency is staggering: 1.76 L/100 km (133.65 mpg) means you’ll visit gas stations less often than your favorite coffee shop. During my test ride, a full 5.5L (1.45-gallon) tank lasted nearly 300 km (186 miles) of mixed riding. The air-cooling system never missed a beat, even in stop-and-go traffic on a 30°C (86°F) afternoon.
Handling & Braking: Agile Like a Mountain Goat
The Grom’s 1,199 mm (47.2-inch) wheelbase and ultra-low weight make it feel like an extension of your body. Flicking it through tight corners or dodging potholes requires minimal effort, thanks to the 25° rake angle and 81mm (3.2-inch) trail. The suspension—118mm (4.6-inch) front travel and 70-104mm (2.8-4.1-inch) rear travel—soaks up bumps adequately, though rough roads can feel jarring.
Braking performance varies by model. Non-ABS versions use a 220mm front disc with a two-piston caliper and a 190mm rear disc, offering decent stopping power for the bike’s weight. ABS-equipped models (2018-2020) add an extra layer of safety, especially in wet conditions. The chunky 120/70-12 front and 130/70-12 rear tires provide surprising grip, encouraging playful leans.
Competition: How Does the Grom Stack Up?
The mini-moto segment exploded in the 2010s, and the Grom faces stiff rivals:
- Kawasaki Z125 Pro: Similar specs but with a slightly taller seat (780mm/30.7in) and a more angular design. The Z125’s 4-speed transmission feels less refined, and its aftermarket support lags behind Honda’s.
- Benelli TNT 135: Offers a larger 135cc engine (13 HP) and a 5-speed gearbox, but weighs 10kg (22 lbs) more. Build quality isn’t as bulletproof as the Grom’s.
- KTM 125 Duke: A pricier, premium option with 15 HP and full-size bike proportions. Better for highway use but loses the Grom’s whimsical charm.
The Grom’s trump card is its customization potential. From stunt cages to big-bore kits, it’s a blank canvas—something competitors still struggle to match.
Maintenance: Keeping Your Grom Happy
Ownership is refreshingly straightforward:
- Oil Changes: Every 3,000 km (1,864 miles) using 10W-30 oil (900ml without filter).
- Chain Care: Clean and lubricate every 500 km (310 miles). The 106-link chain and 15/34 sprocket combo wears evenly if maintained.
- Valve Adjustments: Check every 6,000 km (3,728 miles). Intake valves: 0.08mm (0.0031in), exhaust: 0.12mm (0.0047in).
- Tires: Stick to 2.0 Bar (29 psi) front/rear for optimal grip and longevity.
Common upgrades include LED turn signals, aftermarket exhausts, and suspension kits—all available at MOTOPARTS.store. The air-cooled engine’s simplicity means fewer failure points, but regular checks on the PGM-FI system and throttle response are wise.
Final Thoughts: Why the Grom Endures
The Honda Grom isn’t about speed or practicality—it’s about rediscovering the joy of riding. It’s the bike that makes seasoned motorcyclists grin like teenagers and turns commutes into adventures. While its 125cc engine won’t win drag races, its reliability, efficiency, and customization potential make it a timeless icon. Whether you’re a novice rider or a veteran looking for a weekend toy, the 2017-2020 Grom delivers endless smiles per gallon.
Ready to personalize your Grom? Explore MOTOPARTS.store’s curated selection of upgrades to make your mini-bike uniquely yours.
Specifications sheet
| Engine | |
|---|---|
| Stroke: | Four-stroke |
| Max power: | 7 kW | 9.0 hp |
| Max torque: | 11 Nm |
| Fuel system: | PGM-FI electronic fuel injection |
| Max power @: | 7000 rpm |
| Displacement: | 125 ccm |
| Max torque @: | 5500 rpm |
| Configuration: | Single |
| Cooling system: | Air |
| Compression ratio: | 9.3:1 |
| Number of cylinders: | 1 |
| Dimensions | |
|---|---|
| Wheelbase: | 1200 mm (47.2 in) |
| Dry weight: | 102 |
| Wet weight: | 104 |
| Seat height: | 754–765 mm (29.7–30.1 in) |
| Overall width: | 754 mm (29.7 in) |
| Overall height: | 1010 mm (39.8 in) |
| Overall length: | 1770 mm (69.7 in) |
| Ground clearance: | 165 mm (6.5 in) |
| Fuel tank capacity: | 5.5 L (1.45 US gal) |
| Drivetrain | |
|---|---|
| Final drive: | chain |
| Chain length: | 106 |
| Transmission: | 4-speed, wet multiplate clutch |
| Rear sprocket: | 34 |
| Front sprocket: | 15 |
| Electrical | |
|---|---|
| Battery: | 12V 3.5Ah |
| Headlights: | LED |
| Maintenance | |
|---|---|
| Rear tire: | 130/70-12 |
| Engine oil: | 10W30 |
| Front tire: | 120/70-12 |
| Brake fluid: | DOT 4 |
| Spark plugs: | NGK CPR6EA-9 |
| Spark plug gap: | 0.8–0.9 mm |
| Coolant capacity: | N/A (air-cooled) |
| Engine oil capacity: | 0.9 |
| Engine oil change interval: | Every 5000 km or 2 years |
| Valve clearance (intake, cold): | 0.08 mm |
| Valve clearance (exhaust, cold): | 0.12 mm |
| Recommended tire pressure (rear): | 2.0 bar (29 psi) |
| Recommended tire pressure (front): | 2.0 bar (29 psi) |
| Chassis and Suspension | |
|---|---|
| Frame: | Steel mono-backbone |
| Trail: | 81 mm (3.2 in) |
| Rear brakes: | Single 190 mm disc, 1-piston caliper (ABS on some models) |
| Front brakes: | Single 220 mm disc, 2-piston caliper (ABS on some models) |
| Rear suspension: | Mono shock with steel swingarm |
| Front suspension: | 31mm inverted USD fork |
| Rake (fork angle): | 25.0° |
| Rear wheel travel: | 70 mm (2.8 in) |
| Front wheel travel: | 118 mm (4.6 in) |
