Moto Morini 3 1/2 vs Yamaha RD350

The Yamaha RD350 passes its MOT first time more often than the Moto Morini 3 1/2: 86.3% vs 81.3%, a 5.0-point lead.

MOT reliability, side by side

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

Metric	Moto Morini 3 1/2	Yamaha RD350
First-time pass rate	81.3%	86.3%
Outright fail rate	9.9%	6.6%
Vs comparable bikes (age & mileage adjusted)	-4.5 pts	+2.4 pts
Engine size	344cc	347cc
Median miles at test	27,836	23,256
MOT tests analysed	182	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.

"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	Moto Morini 3 1/2	Yamaha RD350
10k-20k miles	89.8%	87.5%
20k-30k miles	84.2%	85.5%

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

MOTO MORINI 3 1/2 81.3% pass · 182 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.