Data as of: DVSA MOT results to 2025
Suzuki GSF650S vs Kawasaki ZX-6R
The Suzuki GSF650S passes its MOT first time more often than the Kawasaki ZX-6R: 85.5% vs 78.1%, a 7.4-point lead.
MOT reliability, side by side
| Metric | Suzuki GSF650S | Kawasaki ZX-6R |
|---|---|---|
| First-time pass rate | 85.5% | 78.1% |
| Outright fail rate | 8.6% | 14.0% |
| Vs comparable bikes (age & mileage adjusted) | -0.3 pts | -5.8 pts |
| Engine size | 656cc | 599cc |
| Rank among all models | #2363 of 5428 | #3895 of 5428 |
| Median miles at test | 13,302 | 19,446 |
| MOT tests analysed | 9,579 | 173,956 |
| Most common failure | brakes | lighting and signalling |
First-time outcomes on normal tests, 2005–2025. "Most common failure" is the component group with the most recorded defects on failed tests. Read pass rates against test counts: a smaller sample is noisier. Source: DVSA anonymised MOT results.
"Vs comparable bikes" is the first-time pass rate minus the rate expected for each bike's own mix of age, mileage and test class, in percentage points: positive means better than comparable bikes. How this works.
What fails, side by side
| Component | Suzuki GSF650S | Kawasaki ZX-6R |
|---|---|---|
| Lights & signalling | 3.0% | 6.1% |
| Brakes | 3.2% | 5.2% |
| Tyres & wheels | 2.9% | 3.6% |
| Steering & suspension | 1.7% | 4.6% |
| Drive system | 1.0% | 1.0% |
| Structure & body | 0.6% | 1.2% |
| Fuel & exhaust | 0.6% | 0.8% |
A test that fails on two components counts once in each. Component links go to the bikes most likely to fail on it.
Pass rate by test year
| Test year | Suzuki GSF650S | Kawasaki ZX-6R |
|---|---|---|
| 2013 | 86.1% | 75.5% |
| 2014 | 84.0% | 76.4% |
| 2015 | 85.2% | 76.7% |
| 2016 | 83.9% | 77.7% |
| 2017 | 83.2% | 77.1% |
| 2018 | 85.0% | 78.5% |
| 2019 | 86.2% | 78.5% |
| 2020 | 85.0% | 78.1% |
Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.
Pass rate by mileage
| Mileage | Suzuki GSF650S | Kawasaki ZX-6R |
|---|---|---|
| 0k-10k miles | 90.9% | 86.1% |
| 10k-20k miles | 85.8% | 80.6% |
| 20k-30k miles | 81.3% | 75.4% |
| 30k-40k miles | 77.8% | 71.8% |
| 40k-50k miles | 75.0% | 69.5% |
| 50k-60k miles | 66.7% | 69.0% |
Bands with fewer than 30 tests for either bike are left out.
Suzuki GSF650S vs Kawasaki ZX-6R FAQ
Which is more reliable, the Suzuki GSF650S or the Kawasaki ZX-6R?
The Suzuki GSF650S passes its MOT first time more often than the Kawasaki ZX-6R: 85.5% vs 78.1%, a 7.4-point lead. Adjusted for age, mileage and test class, the Suzuki GSF650S still comes out ahead: -0.3 points vs comparable bikes for the Suzuki GSF650S, -5.8 for the Kawasaki ZX-6R. An MOT checks roadworthiness items, not engine or gearbox internals.
What does the Suzuki GSF650S fail its MOT on most?
Brakes: 3.2% of Suzuki GSF650S MOT tests failed on it, then lights & signalling (3.0%).
What does the Kawasaki ZX-6R fail its MOT on most?
Lights & signalling: 6.1% of Kawasaki ZX-6R MOT tests failed on it, then brakes (5.2%).
Which holds up better at high mileage, the Suzuki GSF650S or the Kawasaki ZX-6R?
At 50k-60k miles the Kawasaki ZX-6R passes first time more often: 66.7% for the Suzuki GSF650S vs 69.0% for the Kawasaki ZX-6R.
See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.