Beta Alp 4.0 vs Suzuki DR-Z400S

The Suzuki DR-Z400S passes its MOT first time more often than the Beta Alp 4.0: 80.4% vs 80.1%, a 0.3-point lead.

MOT reliability, side by side

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

Metric	Beta Alp 4.0	Suzuki DR-Z400S
First-time pass rate	80.1%	80.4%
Outright fail rate	6.5%	11.1%
Vs comparable bikes (age & mileage adjusted)	-7.4 pts	-6.5 pts
Engine size	350cc	398cc
Rank among all models	#3557 of 5428	#3493 of 5428
Median miles at test	6,550	6,940
MOT tests analysed	336	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 mileage

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

Mileage	Beta Alp 4.0	Suzuki DR-Z400S
0k-10k miles	78.3%	81.7%
10k-20k miles	82.2%	78.4%

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

BETA ALP 4.0 80.1% pass · 336 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.