Zontes T310 vs Yamaha RD350

The Zontes T310 passes its MOT first time more often than the Yamaha RD350: 89.0% vs 86.3%, a 2.7-point lead.

MOT reliability, side by side

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

Metric	Zontes T310	Yamaha RD350
First-time pass rate	89.0%	86.3%
Outright fail rate	10.3%	6.6%
Vs comparable bikes (age & mileage adjusted)	-0.6 pts	+2.4 pts
Engine size	312cc	347cc
Median miles at test	3,896	23,256
MOT tests analysed	136	19,574
Most common failure	brakes	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	Zontes T310	Yamaha RD350
2023	88.6%	92.2%
2024	87.0%	94.8%
2025	88.6%	93.5%

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

ZONTES T310 89.0% pass · 136 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.