Lexmoto Chieftain TD 125 T-15 vs Yamaha Nmax 125

The Yamaha Nmax 125 passes its MOT first time more often than the Lexmoto Chieftain TD 125 T-15: 82.2% vs 74.1%, a 8.1-point lead.

MOT reliability, side by side

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

Metric	Lexmoto Chieftain TD 125 T-15	Yamaha Nmax 125
First-time pass rate	74.1%	82.2%
Outright fail rate	22.6%	11.4%
Vs comparable bikes (age & mileage adjusted)	-1.7 pts	+9.5 pts
Engine size	125cc	125cc
Rank among all models	#4387 of 5428	#3145 of 5428
Median miles at test	5,757	30,236
MOT tests analysed	460	33,779
Most common failure	brakes	brakes

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	Lexmoto Chieftain TD 125 T-15	Yamaha Nmax 125
2021	77.8%	84.9%
2022	77.6%	83.5%
2023	74.6%	81.5%
2024	72.7%	79.8%
2025	70.5%	80.8%

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	Lexmoto Chieftain TD 125 T-15	Yamaha Nmax 125
0k-10k miles	75.1%	90.9%
10k-20k miles	69.0%	84.2%

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

LEXMOTO CHIEFTAIN TD 125 T-15 74.1% pass · 460 tests YAMAHA NMAX 125 82.2% pass · 33.8k tests

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