Mash XY vs Kawasaki ER5

The Mash XY passes its MOT first time more often than the Kawasaki ER5: 86.4% vs 77.4%, a 9.0-point lead.

MOT reliability, side by side

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

Metric	Mash XY	Kawasaki ER5
First-time pass rate	86.4%	77.4%
Outright fail rate	6.0%	14.2%
Vs comparable bikes (age & mileage adjusted)	-2.9 pts	-6.2 pts
Engine size	397cc	498cc
Rank among all models	#2091 of 5428	#3999 of 5428
Median miles at test	4,544	21,259
MOT tests analysed	653	53,115
Most common failure	lamps and reflectors	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.

What fails, side by side

share of each bike's MOT tests that failed on the component · lower is better

Component	Mash XY	Kawasaki ER5
Lights & signalling	2.1%	5.1%
Brakes	0.3%	6.0%
Steering & suspension	0.6%	5.4%
Tyres & wheels	2.3%	3.6%
Structure & body	1.5%	1.3%
Drive system	0.2%	2.3%
Fuel & exhaust	0%	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

first-time MOT pass rate in each calendar year both bikes were tested

Test year	Mash XY	Kawasaki ER5
2018	70.3%	78.3%
2019	86.6%	77.1%
2020	87.8%	79.4%
2021	83.8%	78.2%
2022	90.4%	77.7%
2023	88.3%	78.2%
2024	83.3%	77.8%
2025	91.7%	79.6%

Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.

Pass rate by mileage

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

Mileage	Mash XY	Kawasaki ER5
0k-10k miles	85.6%	87.5%
10k-20k miles	90.5%	79.5%

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

Mash XY vs Kawasaki ER5 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Mash XY or the Kawasaki ER5?

The Mash XY passes its MOT first time more often than the Kawasaki ER5: 86.4% vs 77.4%, a 9.0-point lead. Adjusted for age, mileage and test class, the Mash XY still comes out ahead: -2.9 points vs comparable bikes for the Mash XY, -6.2 for the Kawasaki ER5. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Mash XY fail its MOT on most?

Tyres & wheels: 2.3% of Mash XY MOT tests failed on it, then lights & signalling (2.1%).

What does the Kawasaki ER5 fail its MOT on most?

Brakes: 6.0% of Kawasaki ER5 MOT tests failed on it, then steering & suspension (5.4%).

MASH XY 86.4% pass · 653 tests KAWASAKI ER5 77.4% pass · 53.1k tests

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