Piaggio PK50: MOT pass rate by registration year

Which PK50 years pass first time, and which fall short of the model's 77.8% average, from 607 DVSA tests.

1985

highest-passing year · 84.7%

1990

lowest-passing year · 80.8%

3.9pp

spread across 3 years

Pass rate by registration year

first-time pass rate · cohorts with 50 or more tests · registration year from first use date

Highest pass rate: 1985 (84.7% of 72 tests). Lowest: 1990 (80.8% of 78).

Registered	Tests	First-time pass	vs model (77.8%)
1985	72	84.7%	+6.9 pp
1988	59	81.4%	+3.6 pp
1990	78	80.8%	+3.0 pp

Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years. A first-time MOT pass is a roadworthiness check, not a full mechanical inspection.

Pass rate over time

first-time pass rate by test year · 2006–2017

Questions

Which PK50 years have the lowest MOT pass rate?: none: no registration year of the Piaggio PK50 falls more than two points under the model's 77.8% overall pass rate.
Which PK50 year has the highest MOT pass rate?: 1985, at 84.7% of 72 first tests (2005–2025). Years more than two points above the model average: 1985, 1988, 1990.
How much does the PK50 pass rate vary by year?: 3.9 percentage points between the highest (1985, 84.7%) and lowest (1990, 80.8%) cohorts with at least 50 tests. Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.

Full report: Piaggio PK50 reliability, failures and mileage · ranked #3940 of 5428 models· other Piaggio models: Vespa, Zip, NRG, PX 125 (vespa), PX 200 E, ET2