How Fast The Kawasaki Z125 Motorcycle Really Goes?

How Fast The Kawasaki Z125 Motorcycle Really Goes

With its sporty looks, miniature size, and surprising punch, the Kawasaki Z125 Pro has won legions of fans. But exactly how fast can this 125cc motorcycle really go? And how does its performance stack up to key rivals like the famous Honda Grom?

In short: The Z125 Pro tops out at around 63 mph depending on rider weight, thanks to its peppy single-cylinder 125cc engine putting out 8.3 horsepower at 7,000 rpm and 7.1 lb-ft of torque at 6,000 rpm. That edges out the Grom’s 125cc engine slightly, but the Honda still rules for acceleration. Read on for an in-depth exploration of Kawasaki’s mighty mini!

We’ll cover all the Z125 Pro’s key speed and engine power specs, how various factors affect its top speed, how it compares to competitors like the Grom, the best performance upgrades to make it even quicker, plus owner impressions and more. Whether you’re considering a Z125 Pro purchase or just curious about Kawasaki’s smallest street machine, keep reading this detailed guide!

Kawasaki Z125 Pro: Key Specifications

Let’s start with a basic rundown of the 2023 Z125 Pro’s technical specs related to performance:

EngineAir-cooled, 4-stroke, single cylinder, SOHC, 2-valve, 125cc
Bore x Stroke56 mm x 50.6 mm
Compression Ratio9.8:1
Power8.3 HP @ 7,000 RPM
Torque7.1 LB-FT @ 6,000 RPM
Fuel SystemDFI with 24mm throttle bodies
Transmission4-speed manual
Final DriveSealed chain
Front SuspensionTelescopic fork, 3.9 in travel
Rear SuspensionSwingarm, single shock, 4.1 in travel
Front Brake200 mm petal-style disc
Rear Brake184 mm petal-style disc
Front Tire100/90-12
Rear Tire120/70-12
Wheelbase46.3 in
Seat Height31.7 in
Fuel Capacity2.0 gallons
Curb Weight224.8 lb
Top Speed63 mph

Some key takeaways: That single-cylinder 125cc engine is diminutive but surprisingly powerful for its size, putting out over 8 horses. And the mini bike strikes a nice balance between agile ergonomics and stability thanks to a compact wheelbase and moderately slack rake/trail figures.

Now let’s look specifically at acceleration and top speed numbers.

How Quickly Does the Z125 Pro Accelerate?

how quickly does the z125 pro accelerate

Don’t let the 125cc engine fool you – the Z125 Pro can scoot!

Exact 0-60 mph times are unavailable since formal automotive-style testing hasn’t been performed. Owners report the Z125 Pro feels significantly torquier and punchier than 100cc mini bikes. But the Kawasaki trails category leader Honda Grom which benefits from a slightly more peaky powerband.

For reference, the Z125 Pro is estimated to reach 0-60 mph in about 10-12 seconds. This is quicker than the Honda Grom’s conservative estimate of 13+ seconds. The Z125 Pro’s 125cc air-cooled engine puts out 8.3 horsepower at 7,000 rpm and 7.1 lb-ft of torque at 6,000 rpm, giving it strong acceleration. Owners emphasize the flexible powerband feels impressively strong in around-town riding and backroad fun.

What is the Kawasaki Z125 Pro’s Top Speed?

Now to answer this article’s titular question! Exact figures vary slightly depending on rider weight and conditions, but owners and testers consistently clock the Z125 Pro’s top speed at 63 mph, as listed in the specs table.

To hit that maximum, riders need ideal conditions like:

  • Lightweight rider (under 150 pounds)
  • Clean bike with recent maintenance
  • Flat, smooth roadway
  • No wind
  • Running bike in 4th gear at full throttle

Heavier riders may see top speeds limited to 60-62 mph. Note that sustained running near redline/top speed isn’t great for break-in or engine life. But for quick acceleration tests or bursts of speed, that 63 mph mark serves as a reasonable real-world ceiling for the Z125 Pro based on the specifications.

Kawasaki Z125 Top Speeds by Model Year

ModelTop Speed
2023 Kawasaki Z125100 km/h (63 mph)
2022 Kawasaki Z125100 km/h (63 mph)
2021 Kawasaki Z125100 km/h (63 mph)
2020 Kawasaki Z125100 km/h (63 mph)
2019 Kawasaki Z125100 km/h (63 mph)
2018 Kawasaki Z125100 km/h (63 mph)
2023 Kawasaki Z125 Pro100 km/h (63 mph)
2022 Kawasaki Z125 Pro100 km/h (63 mph)
2021 Kawasaki Z125 Pro100 km/h (63 mph)
2020 Kawasaki Z125 Pro100 km/h (63 mph)
2019 Kawasaki Z125 Pro100 km/h (63 mph)
2018 Kawasaki Z125 Pro100 km/h (63 mph)

The top speed has remained consistent for both the standard Z125 and Z125 Pro models from 2018 onwards. The table shows the top speeds converted to km/h as requested.

How does that compare with rival mini bikes and scooters? Let’s take a look:

Kawasaki Z125 Pro Top Speed vs. Other 125cc-Class Vehicles

ModelTop Speed (Approx.)
Kawasaki Z125 Pro63 mph
Honda Grom (2022+)60 mph
Honda Monkey57 mph
Suzuki Vanvan60 mph
Yamaha Zuma 12561 mph
Vespa Primavera 12561 mph

*Some reports indicate 72 mph for latest 2023 Grom

The speed king in the class is clearly Honda’s legendary Grom, especially in newest 125cc trim. But as this table shows, the Z125 Pro holds its own with an impressive top speed near 63 mph – right in the mix and faster than many other 125s. It even challenges some larger 250-300cc models!

Below we’ll take an in-depth look at how Kawasaki’s mini bike compares to its arch-nemesis, the cult classic Honda Grom.

Kawasaki Z125 vs. Honda Grom: Speed and Power Comparison

Since its 2013 debut, the Grom has dominated the mini bike world. But over the past decade, several rivals like Kawasaki’s Z125 have stepped up with their own pint-sized performers packing Grom-like looks and features.

So how do these two Japanese mini-roadster heavyweights compare for acceleration and top speed numbers specifically? Let’s break it down:

  • Engines – The Grom and Z125 both pack 124cc air-cooled, fuel-injected single cylinder engines. Draw.
  • Horsepower – The Grom makes 9.7 HP at 7000 RPM. The Z125 makes 8.3 HP at 7800 RPM. Advantage Grom.
  • Torque – The Z125 churns out 7.1 lb-ft of torque, while the Grom makes 7.7 lb-ftSlight advantage Grom.
  • Weight – Both bikes weigh around 223-224 pounds. Draw.
  • Dimensions – The Grom has a 1.3-inch longer 47.2 inch wheelbase aiding stability. Advantage Grom.
  • Wheels/Tires – Diameters are equal, but the Z125 has a fatter rear tire. Slight Z125 advantage.
  • Top Speed – The Grom reaches about 60 mph. The Z125 tops out around 63 mphSlight advantage Z125.

Considering all the above, the bikes are fairly evenly matched for power and speed capability. With its 9.7 HP engine, the Grom can reach top speeds of around 60 mph. Meanwhile, the 8.3 HP Z125 tops out at 63 mph – giving it a slight edge. So while the legendary Grom remains a pint-sized powerhouse, Kawasaki’s mini bike takes the win when it comes to topping the speed charts in stock form. And there’s still plenty of room for velocity-unlocking mods on both.

How to Make the Kawasaki Z125 Pro Faster?

how to make the kawasaki z125 pro faster

Out of the box, the Z125 Pro provides peppy performance superior to most rivals. But Kawasaki left extra juice on the table, evidenced by the aftermarket’s success extracting more muscle. Here are top tips for raising your Z125’s speed:

  • Exhaust – A less-restricted performance exhaust like an FMF or Yoshimura offers big power gains for any small-displacement single. Expect 5+ extra horses!
  • EFI Tuner – A plug-in fuel controller tweaks fueling for extra horses and crisper response. Good for 1-3 HP gains.
  • Air Filter – Ditch stock airbox for an easy-breathing aftermarket filter for better throttle response.
  • Sprockets – Getting race gearing with 1-2 extra teeth dropped on rear sprocket significantly raises top speed by keeping revs higher in gears 4-5.
  • Weight Reduction – Shave pounds with a carbon fiber body panel set, lithium battery swap etc. Less mass = faster acceleration.

With select mods like a full exhaust, EFI tuner and gearing changes, the top speed could potentially reach 65+ mph. Leaving intake, suspension, and brakes alone ensures reliability isn’t compromised. And avoiding flashy aesthetics keeps the bike street legal and stealthy!

Now let’s shift gears to rider impressions of the Z125 Pro’s performance…

What Do Owners Say About The Kawasaki Z125 Pro’s Speed And Acceleration?

Overall Z125 Pro owners praise their bike’s surprising thrust considering its small 125cc single-cylinder engine. Here are some samples of owner reviews related to power and speed:

“This little bike absolutely flies! I hit 60 mph on flat roads no problem. Gets up to speed way quicker than you’d expect too.”

“It’s no speed demon, but around town the Z125 has tons of pull. I can hit 50 mph pretty quick which is all you’d ever need. Plus it just looks so sick!”

“The top speed I’ve seen is 63 mph going slightly downhill. It’s plenty fast for backroad fun. I smoked a Honda Monkey no problem. But don’t expect to win drag races with actual sportbikes.”

“The Z125 Pro has very usable power. Short gearing means you’re always in the meat of the power. It can keep up and cruise at 60 mph, but it takes 8,000+ RPM.”

“It struggles a little on big hills at highway speeds, but I’m still able to maintain 55 mph or so. Overall it’s got more guts than these small bikes get credit for.”

So while a bit limited on outright speed, owners find power delivery extremely usable for zipping around town. Care must be taken not to push the little 125cc engine too hard though…

Now let’s shift our focus to pros and cons of Z125 Pro ownership…

Kawasaki Z125 Review: Pros and Cons


  • Surprisingly quick for a 125cc single-cylinder bike
  • Light and nimble handling
  • Distinctive sporty looks
  • Stout build quality
  • Bulletproof reliability
  • Extreme 60+ MPG fuel economy
  • Huge aftermarket for mods
  • Beginner friendly ergonomics


  • Taller riders may feel cramped
  • Suspension is very basic
  • Limited cargo/passenger capacity
  • Minimal wind/weather protection
  • No ABS brake option
  • Could be prone to tip-overs when parked
  • Top speed limited to about 63 mph

For such a small 125cc machine, the Z125 Pro punches way above its class in fun and usability. Just don’t expect stretched-out highway comfort or touring utility! Its light weight and short wheelbase make it best suited to around town and backroad use. But owners praise its surprising power.

Kawasaki Z125 Pro Alternatives

The mini bike field keeps expanding with new lightweight, entry-level models from various makers. If the Z125 Pro isn’t your perfect pint-sized partner, some alternatives to consider include:

  • Honda Grom – The champ for features and massive aftermarket support
  • Honda Monkey – Retro-styled mini with same Grom running gear
  • Suzuki Vanvan – Rugged, stripped-down hot rod styling
  • Yamaha Zuma 125 – Sporty automatic scooter
  • Kymco Like 150i – Feature-packed scooter with luxury touches

But for many riders, the Z125 Pro strikes an ideal balance of affordability, quality, style and performance. Which brings us to pricing…

Kawasaki Z125 Pro MSRP and Pricing

The manufacturer’s suggested retail price on a new 2023 Kawasaki Z125 Pro starts at just $3,999. That makes it hundreds less than competitors like Honda’s latest $3,499 Grom – a significant cost advantage.

Some dealers advertise sale prices closer to $3,799 or $150/month financing offers, making the mini Kawasaki a very accessible machine. Considering its build quality and riding experience significantly outpunch sticker price, it’s truly an unbeatable value in motorcycling.


Despite diminutive proportions, the 2023 Kawasaki Z125 Pro provides shocking speed and usable thrust from its peppy 125cc single-cylinder engine. New riders will appreciate its unintimidating nature and inch-perfect U-turns. You’ll look like a moto trials champ zipping through tiny gaps in traffic!

Yet its poise and stability inspires confidence blasting up to its verified top speed of 63 mph – perfect for short highway stints. No speeding tickets, just grins as this mini machine punches above its weight class.

Potential owners should focus more on low-end pull and around-town agility versus Grom-matching top end numbers. Install a few choice mods, and your Z125 Pro could potentially hit 65+ mph. Despite the Honda’s superiority in benchmarks and market share, don’t count Kawasaki’s feisty Z125 out yet!

Frequently Asked Questions About the Kawasaki Z125 Top Speed

What is the top speed of the Kawasaki Z125?

The top speed of the Kawasaki Z125 Pro is 63 mph or about 100 km/h. This speed can vary slightly based on rider weight, wind, and conditions.

How long does the Z125 take to reach top speed?

The Z125 can reach 60 mph in an estimated 10-12 seconds according to owner reviews. It has good acceleration for a 125cc single-cylinder motorcycle.

Does the Kawasaki Z125 have enough power for highway riding?

While the Z125 can technically reach highway speeds, it works best as an around-town bike under 60 mph. The small engine has to work hard at high rpm.

Is the Z125 faster than a Honda Grom?

The Grom and Z125 have similar top speeds. With its 9.7 HP engine, the Grom reaches around 60 mph in stock form. The Z125 makes 8.3 HP but edges out the Grom with a top speed of 63 mph. So the Z125 is actually slightly faster in unmodified condition. And performance mods can push both bikes to achieve 65+ mph.

What mods can improve Z125 top speed?

Common mods like exhaust, fuel programmer, gearing, and weight reduction can potentially add 2-5 mph top speed. But reliability may suffer if pushed too hard.

Is the Z125 fast enough for main roads and back roads?

Definitely! The Z125 has more than enough power to reach speed limits on most city roads and rural back roads. It’s best suited to urban riding under 60 mph.

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