By NastyNils·
Motorcycle comparison · Naked Bike
Kawasaki Z900 (MY2020) vs Suzuki GSX-S1000 (MY2025)
Kawasaki Z900 vs Suzuki GSX-S1000: no fairing, no excuses. Here's how to pick.
Roll on the gas out of a bend on the Kawasaki Z900 and the front goes light, but the chassis doesn't weave as the bike hooks up and drives. On the Suzuki GSX-S1000, the engine's tone turns hard once you wind it past the midrange. It's screaming right up to the limiter.
So which one do you buy?
The Z900 has the edge if…
Daily commuting & city riding
Nose ahead: Z900
On the way to work, the Z900 asks a little less of you. Close enough that the test ride should settle it.
Traveling with luggage
A touch ahead: Z900
Loaded for the road, the Z900 comes out a touch ahead. Don't read too much into a gap this narrow.
What makes each one tick
Z900
Some of the Z900's parts look plain parked at the curb, but that doesn't matter once the wheels roll. After extended use, nothing broke and nothing disappointed. Flick it through a radius and it responds immediately. Over a pothole in stop-and-go traffic, the dialed-in suspension keeps the front tire tracking where it's aimed. Motor and chassis tuning agree. The four spins eagerly up to its cutout.
Nils rode the Z900 in Austria and Switzerland in 2020 (NastyNils Testride).
GSX-S1000
On the quick left-right switches of Angeles Crest Highway, the GSX-S1000's aluminum frame stays flat and holds its line. After a handful of corners you're already committing to your line on instinct. The brake lever slows the bike the instant it's touched. Real stopping takes a firmer squeeze. The exhaust growls all the way up.
Nils rode the GSX-S1000 in Austria and Hungary in 2025 (NastyNils Testride).
The Voice of Experience
What actually separates them
- The GSX-S1000 makes more peak power: 152 hp (112 kW) vs 125 hp (92 kW).
- The GSX-S1000 makes more peak torque: 78 lb-ft (106 Nm) vs 73 lb-ft (99 Nm).
- The GSX-S1000 has the larger engine: 999 cc vs 948 cc.
Which one for the way you ride
Comfortable long-distance riding
Not built for this
For all-day comfort, both fall short. Keep the rides short and you'll get on fine with either.
A confidence-building first motorcycle
Not their thing
As first bikes, both are a stretch. Starting smaller isn't a step down.
For twisty roads, you won't find daylight between them. Let the test ride settle it.
Who each one is built for
What's good, and what you'll live with
Z900
Strengths
- Approachable Or Fast, Your Call
- Proven Over Months Of Testing
- Brakes Beat Their Spec Sheet
- Seat Fits A Wide Range
- Planted, Precise Chassis
Trade-offs
- Handlebar Too Thin
- Menus Fight Back
- Firm In Daily Traffic
- Snatchy Throttle Down Low
- No wind protection
GSX-S1000
Strengths
- Real Superbike Frame Underneath
- Top End Turns Savage
- Drivetrain Works As One Unit
- Planted Through Fast Transitions
- Thick Mid-Range In Any Gear
Trade-offs
- Brakes Need Real Effort
- Suspension Soft From The Crate
- Mode A Is Hair-Trigger
- Thin paint and finish
Known problems to check before you buy
Z900
- Base Model Suspension Struggles with Spirited Riding and Heavier Riders The standard suspension—KYB USD fork with no compression damping adjustment—dives excessively under hard braking. The rear shock sags during acceleration. It proves inadequate for heavier riders (200+ lb) and two-up riding. The setup is designed primarily for commuting and medium-speed riding. The 2022 SE with Öhlins S46 dampers and improved fork solves these issues.
- False Neutrals and Clunky Transmission The transmission occasionally misses shifts, especially during quick upshifts above ~6,000 rpm. Most frequent between 2nd-3rd and 3rd-4th gears. Design-related play in the shift linkage. Downshifts described as clunky. Issue carried over from previous model—engine and transmission are carry-over parts.
- Front ABS intervenes prematurely under hard braking The ABS calibration is conservative and tends to intervene early, particularly at the front wheel under hard braking or over bumpy and uneven surfaces. Riders feel pulsing at the brake lever and a lengthened stop before the tire has reached its real grip limit. The system has a single fixed calibration that does not change with the selected riding mode, and there is no rider-selectable ABS-off function, so the early intervention is present at all times.
- Snatchy/Jerky Throttle Response at Low RPM The Z900 exhibits jerky, on/off-like throttle response at low RPM and speeds, particularly in 1st and 2nd gear. The motorcycle lurches when holding a constant low speed. Improved compared to the 2017-2019 generation, but not resolved. The first degree of throttle turn has a sharp snatch that disrupts smooth application, and snatchy low-speed throttle manners persist. Caused by emissions-related ECU tuning, not a mechanical defect.
- Unstable Bluetooth Connection, App Crashes, Pairing Issues The Kawasaki Rideology app (for the TFT display) exhibits recurring Bluetooth connectivity issues on both iOS and Android. Pairing drops after restarting the motorcycle, particularly with Android/Samsung devices. In rare cases, the cockpit's Bluetooth chip fails entirely, requiring instrument cluster replacement. App update 2.8.2 added a requirement for internet connectivity during the Bluetooth handshake.
- Turn Signal Mount Rubber Inserts Become Brittle and Break The rubber inserts holding the stock turn signals in the body become brittle and break, causing the signals to hang loose on their wires. Vibration and UV radiation accelerate deterioration. OEM replacement turn signals also fail within 1–2 years. Affects multiple Kawasaki models of the same design, not just the Z900.
- Idle RPM Decreases Over Time, Causing Rough Running Idle RPM gradually decreases over time, resulting in rough idle, stumbling, and occasional stalling. Some owners report idle RPM dropping below 1,000. Cold-start idle can climb to 2,500 rpm. Possible solutions include idle RPM adjustment, ECU software update, and fuel quality verification.
- OEM Front Brake Pads Wearing Out Faster Than Expected The stock sintered brake pads wear out during normal use after approximately 8,000–10,000 miles until reaching the wear limit. Inner pads wear faster than outer pads.
- Surface Corrosion on Stock Steel Screws and Fasteners Stock steel screws and fasteners develop surface rust, especially in humid or coastal climates. Kawasaki uses standard steel fasteners instead of stainless steel or coated hardware.
GSX-S1000
- Sticky ignition key barrel The ignition lock can become difficult to turn, especially over time, requiring lubrication or eventual replacement.
- Starter motor occasionally fails to engage Some owners experience a clicking noise when pressing the starter button; the issue may be related to the starter relay or battery cable connections.
- Thin paint and corrosion-prone fasteners Owners report that the paint on the frame and engine covers chips easily, and some hardware shows rust after a few years.
What they share
- Engine
- Inline-four
- Cooling
- Liquid-cooled
- Gearbox
- 6-speed
- Front tire
- 120/70-17
Where the spec sheets split
| Z900 | GSX-S1000 | |
|---|---|---|
| Seat height | 31.5 in (800 mm) | 31.9 in (810 mm) |
| Wet weight | 467 lb (212 kg) | 472 lb (214 kg) |
| Z900 | GSX-S1000 | |
|---|---|---|
| Displacement | 948 cc | 999 cc |
| Power | 125 hp (92 kW) | 152 hp (112 kW) |
| Torque | 73 lb-ft (99 Nm) | 78 lb-ft (106 Nm) |
| Z900 | GSX-S1000 | |
|---|---|---|
| Fuel capacity | 4.5 US gal (17 L) | 5.0 US gal (19 L) |
| Z900 | GSX-S1000 | |
|---|---|---|
| Rear tire | 180/55-17 | 190/50-17 |
What comes fitted, what costs extra
| Z900 | GSX-S1000 | |
|---|---|---|
| Quickshifter | Not offered | Standard |
| USB Charging Port | Option | Not offered |
Head to head, area by area
Both bikes on the same scale, one area at a time.
