Mash XY 400-2 vs Suzuki DR-Z400S

The Suzuki DR-Z400S passes its MOT first time more often than the Mash XY 400-2: 80.4% vs 79.8%, a 0.6-point lead.

MOT reliability, side by side

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

Metric	Mash XY 400-2	Suzuki DR-Z400S
First-time pass rate	79.8%	80.4%
Outright fail rate	7.2%	11.1%
Vs comparable bikes (age & mileage adjusted)	-10.3 pts	-6.5 pts
Engine size	397cc	398cc
Rank among all models	#3628 of 5428	#3493 of 5428
Median miles at test	2,907	6,940
MOT tests analysed	208	26,773
Most common failure	lamps and reflectors	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.

Pass rate by test year

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

Test year	Mash XY 400-2	Suzuki DR-Z400S
2021	69.2%	83.4%
2022	81.4%	81.8%
2023	80.0%	84.9%
2024	82.1%	84.3%
2025	90.6%	83.7%

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

MASH XY 400-2 79.8% pass · 208 tests SUZUKI DR-Z400S 80.4% pass · 26.8k tests

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