Royal Enfield 350 vs Suzuki DR-Z400S

The Royal Enfield 350 passes its MOT first time more often than the Suzuki DR-Z400S: 91.6% vs 80.4%, a 11.2-point lead.

MOT reliability, side by side

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

Metric	Royal Enfield 350	Suzuki DR-Z400S
First-time pass rate	91.6%	80.4%
Outright fail rate	4.0%	11.1%
Vs comparable bikes (age & mileage adjusted)	+1.0 pts	-6.5 pts
Engine size	349cc	398cc
Rank among all models	#546 of 5428	#3493 of 5428
Median miles at test	7,788	6,940
MOT tests analysed	428	26,773
Most common failure	lighting and signalling	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	Royal Enfield 350	Suzuki DR-Z400S
2007	91.7%	83.1%
2008	97.0%	80.5%
2009	97.3%	78.2%
2010	93.5%	78.9%
2011	82.1%	78.3%
2012	94.4%	79.8%
2014	81.8%	78.5%
2015	84.4%	79.9%

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	Royal Enfield 350	Suzuki DR-Z400S
0k-10k miles	91.8%	81.7%
10k-20k miles	85.3%	78.4%
20k-30k miles	97.8%	79.2%

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

ROYAL ENFIELD 350 91.6% pass · 428 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.