Kawasaki Z900A4 vs Triumph Speed Triple

The Kawasaki Z900A4 passes its MOT first time more often than the Triumph Speed Triple: 92.0% vs 85.6%, a 6.4-point lead.

MOT reliability, side by side

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

Metric	Kawasaki Z900A4	Triumph Speed Triple
First-time pass rate	92.0%	85.6%
Outright fail rate	4.5%	7.3%
Vs comparable bikes (age & mileage adjusted)	+7.0 pts	-0.2 pts
Engine size	903cc	1,050cc
Rank among all models	#470 of 5428	#2333 of 5428
Median miles at test	31,460	12,419
MOT tests analysed	311	74,618
Most common failure	lighting and signalling	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.

Pass rate by mileage

first-time MOT pass rate by miles on the clock at test

Mileage	Kawasaki Z900A4	Triumph Speed Triple
0k-10k miles	93.0%	88.2%
10k-20k miles	94.1%	85.5%
20k-30k miles	100.0%	82.8%
30k-40k miles	89.1%	80.4%
40k-50k miles	92.5%	80.3%

Bands with fewer than 30 tests for either bike are left out.

KAWASAKI Z900A4 92.0% pass · 311 tests TRIUMPH SPEED TRIPLE 85.6% pass · 74.6k tests

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