Beta Alp 4.0 vs Yamaha RD350

The Yamaha RD350 passes its MOT first time more often than the Beta Alp 4.0 — 86.3% vs 80.1%, a 6.2-point lead.

MOT reliability, side by side

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

Metric	Beta Alp 4.0	Yamaha RD350
First-time pass rate	80.1%	86.3%
Outright fail rate	6.5%	6.6%
Median miles at test	6,550	23,256
MOT tests analysed	336	19,574
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.

BETA ALP 4.0 80.1% pass · 336 tests YAMAHA RD350 86.3% pass · 19.6k tests

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