Lambretta SX150 vs Honda PCX 125

The Lambretta SX150 passes its MOT first time more often than the Honda PCX 125: 89.7% vs 81.1%, a 8.6-point lead.

MOT reliability, side by side

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

Metric	Lambretta SX150	Honda PCX 125
First-time pass rate	89.7%	81.1%
Outright fail rate	4.8%	12.9%
Vs comparable bikes (age & mileage adjusted)	+7.7 pts	+8.2 pts
Engine size	150cc	125cc
Rank among all models	#1049 of 5428	#3358 of 5428
Median miles at test	2,549	16,405
MOT tests analysed	3,964	88,608
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	Lambretta SX150	Honda PCX 125
Brakes	1.8%	6.7%
Lights & signalling	2.5%	3.9%
Steering & suspension	1.7%	4.4%
Tyres & wheels	0.8%	5.3%
Structure & body	0.3%	0.7%
Fuel & exhaust	0.2%	0.0%

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	Lambretta SX150	Honda PCX 125
2014	90.6%	84.4%
2015	90.7%	83.5%
2016	89.2%	82.5%
2017	92.6%	80.5%
2018	95.2%	81.2%
2019	90.9%	79.9%
2020	93.3%	82.3%
2021	90.6%	80.3%

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	Lambretta SX150	Honda PCX 125
0k-10k miles	90.3%	88.4%
10k-20k miles	87.7%	79.3%
20k-30k miles	88.1%	78.0%
30k-40k miles	93.1%	77.0%
40k-50k miles	89.9%	74.8%
50k-60k miles	73.5%	75.8%

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

Lambretta SX150 vs Honda PCX 125 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Lambretta SX150 or the Honda PCX 125?

The Lambretta SX150 passes its MOT first time more often than the Honda PCX 125: 89.7% vs 81.1%, a 8.6-point lead. Adjusted for age, mileage and test class the two are level (+7.7 vs +8.2 points against comparable bikes), so the raw gap is mostly down to how old and how used each fleet is. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Lambretta SX150 fail its MOT on most?

Lights & signalling: 2.5% of Lambretta SX150 MOT tests failed on it, then brakes (1.8%).

What does the Honda PCX 125 fail its MOT on most?

Brakes: 6.7% of Honda PCX 125 MOT tests failed on it, then tyres & wheels (5.3%).

Which holds up better at high mileage, the Lambretta SX150 or the Honda PCX 125?

At 50k-60k miles the Honda PCX 125 passes first time more often: 73.5% for the Lambretta SX150 vs 75.8% for the Honda PCX 125.

LAMBRETTA SX150 89.7% pass · 3,964 tests HONDA PCX 125 81.1% pass · 88.6k tests

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