Piaggio PX vs Lambretta LI150

The Lambretta LI150 passes its MOT first time more often than the Piaggio PX: 88.8% vs 82.8%, a 6.0-point lead.

MOT reliability, side by side

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

Metric	Piaggio PX	Lambretta LI150
First-time pass rate	82.8%	88.8%
Outright fail rate	11.2%	5.9%
Vs comparable bikes (age & mileage adjusted)	+8.1 pts	+6.4 pts
Engine size	196cc	150cc
Rank among all models	#3007 of 5428	#1332 of 5428
Median miles at test	11,384	2,944
MOT tests analysed	2,167	19,294
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.

What fails, side by side

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

Component	Piaggio PX	Lambretta LI150
Lights & signalling	6.9%	3.3%
Brakes	3.0%	2.1%
Steering & suspension	2.8%	1.8%
Tyres & wheels	2.4%	0.9%
Structure & body	1.1%	0.2%
Fuel & exhaust	0.4%	0.3%

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	Piaggio PX	Lambretta LI150
2018	80.6%	90.2%
2019	84.5%	92.6%
2020	81.2%	93.0%
2021	86.3%	94.3%
2022	88.4%	90.0%
2023	84.0%	90.8%
2024	96.4%	95.9%
2025	82.8%	97.1%

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	Piaggio PX	Lambretta LI150
0k-10k miles	84.6%	88.8%
10k-20k miles	82.8%	89.8%
20k-30k miles	78.3%	87.0%
30k-40k miles	82.7%	88.2%
40k-50k miles	78.2%	88.8%

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

Piaggio PX vs Lambretta LI150 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Piaggio PX or the Lambretta LI150?

The Lambretta LI150 passes its MOT first time more often than the Piaggio PX: 88.8% vs 82.8%, a 6.0-point lead. Adjusted for age, mileage and test class, the Piaggio PX still comes out ahead: +8.1 points vs comparable bikes for the Piaggio PX, +6.4 for the Lambretta LI150. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Piaggio PX fail its MOT on most?

Lights & signalling: 6.9% of Piaggio PX MOT tests failed on it, then brakes (3.0%).

What does the Lambretta LI150 fail its MOT on most?

Lights & signalling: 3.3% of Lambretta LI150 MOT tests failed on it, then brakes (2.1%).

Which holds up better at high mileage, the Piaggio PX or the Lambretta LI150?

At 40k-50k miles the Lambretta LI150 passes first time more often: 78.2% for the Piaggio PX vs 88.8% for the Lambretta LI150.

PIAGGIO PX 82.8% pass · 2,167 tests LAMBRETTA LI150 88.8% pass · 19.3k tests

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