Zero Motorcycles Sr/s ZF14.4 vs Suzuki GSF600

The Zero Motorcycles Sr/s ZF14.4 passes its MOT first time more often than the Suzuki GSF600: 89.2% vs 77.3%, a 11.9-point lead.

MOT reliability, side by side

first-time pass rate, outright fail rate and tests analysed · 2005–2025

Metric	Zero Motorcycles Sr/s ZF14.4	Suzuki GSF600
First-time pass rate	89.2%	77.3%
Outright fail rate	8.1%	14.2%
Vs comparable bikes (age & mileage adjusted)	+0.8 pts	-6.1 pts
Engine size	n/a	599cc
Median miles at test	6,015	21,080
MOT tests analysed	111	143,023
Most common failure	brakes	brakes

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.

ZERO MOTORCYCLES SR/S ZF14.4 89.2% pass · 111 tests SUZUKI GSF600 77.3% pass · 143k tests

See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.