Kawasaki Z900A4 vs Aprilia Tuono

The Kawasaki Z900A4 passes its MOT first time more often than the Aprilia Tuono: 92.0% vs 88.4%, a 3.6-point lead.

MOT reliability, side by side

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

Metric	Kawasaki Z900A4	Aprilia Tuono
First-time pass rate	92.0%	88.4%
Outright fail rate	4.5%	5.5%
Vs comparable bikes (age & mileage adjusted)	+7.0 pts	+2.3 pts
Engine size	903cc	998cc
Rank among all models	#470 of 5428	#1478 of 5428
Median miles at test	31,460	11,489
MOT tests analysed	311	34,724
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	Aprilia Tuono
0k-10k miles	93.0%	90.7%
10k-20k miles	94.1%	87.2%
20k-30k miles	100.0%	86.2%
30k-40k miles	89.1%	84.6%
40k-50k miles	92.5%	82.1%

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

KAWASAKI Z900A4 92.0% pass · 311 tests APRILIA TUONO 88.4% pass · 34.7k tests

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