Vespa (douglas) PX vs Yamaha Nmax 125

The Vespa (douglas) PX passes its MOT first time more often than the Yamaha Nmax 125: 82.5% vs 82.2%, a 0.3-point lead.

MOT reliability, side by side

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

Metric	Vespa (douglas) PX	Yamaha Nmax 125
First-time pass rate	82.5%	82.2%
Outright fail rate	9.8%	11.4%
Vs comparable bikes (age & mileage adjusted)	+4.5 pts	+9.5 pts
Engine size	124cc	125cc
Rank among all models	#3073 of 5428	#3145 of 5428
Median miles at test	16,427	30,236
MOT tests analysed	1,533	33,779
Most common failure	lighting and signalling	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.

What fails, side by side

share of each bike's MOT tests that failed on the component · lower is better

Component	Vespa (douglas) PX	Yamaha Nmax 125
Lights & signalling	6.6%	4.2%
Steering & suspension	3.5%	5.0%
Brakes	2.2%	5.3%
Tyres & wheels	2.3%	3.7%
Structure & body	0.8%	0.6%
Fuel & exhaust	0.5%	0%

A test that fails on two components counts once in each. Component links go to the bikes most likely to fail on it.

Pass rate by test year

first-time MOT pass rate in each calendar year both bikes were tested

Test year	Vespa (douglas) PX	Yamaha Nmax 125
2017	93.4%	81.1%
2018	87.0%	86.3%
2019	87.5%	84.9%
2020	77.3%	88.4%
2021	80.4%	84.9%
2022	86.0%	83.5%
2023	89.5%	81.5%
2024	94.3%	79.8%

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	Vespa (douglas) PX	Yamaha Nmax 125
0k-10k miles	81.9%	90.9%
10k-20k miles	83.4%	84.2%
20k-30k miles	82.9%	81.9%
30k-40k miles	83.6%	79.2%
40k-50k miles	79.1%	79.8%

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

Vespa (douglas) PX vs Yamaha Nmax 125 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Vespa (douglas) PX or the Yamaha Nmax 125?

The Vespa (douglas) PX passes its MOT first time more often than the Yamaha Nmax 125: 82.5% vs 82.2%, a 0.3-point lead. Adjusted for age, mileage and test class, the Yamaha Nmax 125 still comes out ahead: +4.5 points vs comparable bikes for the Vespa (douglas) PX, +9.5 for the Yamaha Nmax 125. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Vespa (douglas) PX fail its MOT on most?

Lights & signalling: 6.6% of Vespa (douglas) PX MOT tests failed on it, then steering & suspension (3.5%).

What does the Yamaha Nmax 125 fail its MOT on most?

Brakes: 5.3% of Yamaha Nmax 125 MOT tests failed on it, then steering & suspension (5.0%).

Which holds up better at high mileage, the Vespa (douglas) PX or the Yamaha Nmax 125?

They are level: at 40k-50k miles the Vespa (douglas) PX passes 79.1% first time and the Yamaha Nmax 125 79.8%.

VESPA (DOUGLAS) PX 82.5% pass · 1,533 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.