Jawa 350/639: MOT pass rate by registration year

Which 350/639 years pass first time, and which fall short of the model's 85.2% average, from 769 DVSA tests.

1993

highest-passing year · 89.4%

1991

lowest-passing year · 82.4%

7.0pp

spread across 5 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: 1993 (89.4% of 141 tests). Lowest: 1991 (82.4% of 170). Years more than two points below the model average: 1991, 1992.

Registered	Tests	First-time pass	vs model (85.2%)
1990	167	87.4%	+2.2 pp
1991	170	82.4%	-2.8 pp
1992	132	82.6%	-2.6 pp
1993	141	89.4%	+4.2 pp
1994	80	86.3%	+1.1 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 · 2006–2021

Questions

Which 350/639 years have the lowest MOT pass rate?: 1991, 1992 registered examples pass first time less often than the Jawa 350/639 overall (85.2%); the 1991 cohort is lowest at 82.4% from 170 tests.
Which 350/639 year has the highest MOT pass rate?: 1993, at 89.4% of 141 first tests (2005–2025). Years more than two points above the model average: 1990, 1993.
How much does the 350/639 pass rate vary by year?: 7.0 percentage points between the highest (1993, 89.4%) and lowest (1991, 82.4%) 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: Jawa 350/639 reliability, failures and mileage · ranked #2445 of 5428 models· other Jawa models: 210, 350/640, 350, 350 D/L, 350 S/C, 350 Classic