Vespa (douglas) PK125 vs Piaggio Vespa

The Vespa (douglas) PK125 and Piaggio Vespa have an identical 80.7% first-time MOT pass rate.

MOT reliability, side by side

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

Metric	Vespa (douglas) PK125	Piaggio Vespa
First-time pass rate	80.7%	80.7%
Outright fail rate	14.3%	12.2%
Vs comparable bikes (age & mileage adjusted)	+2.0 pts	+5.9 pts
Engine size	121cc	124cc
Median miles at test	12,543	10,023
MOT tests analysed	161	287,482
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.

Pass rate by mileage

first-time MOT pass rate by miles on the clock at test

Mileage	Vespa (douglas) PK125	Piaggio Vespa
0k-10k miles	83.3%	85.0%
10k-20k miles	74.0%	77.0%

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

VESPA (DOUGLAS) PK125 80.7% pass · 161 tests PIAGGIO VESPA 80.7% pass · 287k tests

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