PIAGGIO PK50S

50cc Petrol Class 1

#3940 of 5426 overall #88 of 136 PIAGGIOs #96 of 455 moped bikes

77.8%

first-time pass rate

13.9%

failed outright

12,326

median miles at test

252

MOT tests, 2005–2025

Pass rate by mileage

how the PK50S's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage PK50S passes first time 75.2% of the time; by 20k that's 90.0%.

First-time pass rate by odometer reading at test, 10,000-mile bands for this model. Mileage is the strongest reliability signal. See the full curve.

What fails on a PK50S

failure defects by component group · advisories excluded

Component group	Defects	% of defects
lighting and signalling	48	47.5
brakes	19	18.8
steering and suspension	17	16.8
reg plates and vin	4	4
body and structure	3	3
tyres and wheels	2	2
Items Not Tested	2	2
driving controls	2	2
steering	2	2
structure and attachments	2	2

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the PK50S beats 4 of its 4 closest rivals (PEUGEOT SPEEDFIGHT, PIAGGIO ZIP, PIAGGIO NRG).

PEUGEOT SPEEDFIGHT 65.2% pass · 83.7k tests PIAGGIO ZIP 71.3% pass · 79.0k tests PIAGGIO NRG 65.5% pass · 40.5k tests PEUGEOT VIVACITY 70.4% pass · 29.7k tests

Rivals share this bike's type and sit within ±30% of its engine capacity, ≥ 5,000 tests. Card colour = better/worse first-time pass rate than the PK50S.

Pass rate by registration year

how each model-year cohort fares · registration year from first use date

Best year to buy used: 1984 (89.1% pass). Weakest: 1983 (76.5%).

First-time pass rate by the year each bike was first registered (cohorts with ≥ 50 tests). Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.