Yamaha CW 50 NG Org: MOT pass rate by registration year

Which CW 50 NG Org years pass first time, and which fall short of the model's 72.5% average, from 597 DVSA tests.

2006

highest-passing year · 75.9%

2005

lowest-passing year · 65.8%

10.1pp

spread across 4 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: 2006 (75.9% of 199 tests). Lowest: 2005 (65.8% of 117). Years more than two points below the model average: 2005, 2007.

Registered	Tests	First-time pass	vs model (72.5%)
2004	98	74.5%	+2.0 pp
2005	117	65.8%	-6.7 pp
2006	199	75.9%	+3.4 pp
2007	138	69.6%	-2.9 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 · 2008–2015

Questions

Which CW 50 NG Org years have the lowest MOT pass rate?: 2005, 2007 registered examples pass first time less often than the Yamaha CW 50 NG Org overall (72.5%); the 2005 cohort is lowest at 65.8% from 117 tests.
Which CW 50 NG Org year has the highest MOT pass rate?: 2006, at 75.9% of 199 first tests (2005–2025).
How much does the CW 50 NG Org pass rate vary by year?: 10.1 percentage points between the highest (2006, 75.9%) and lowest (2005, 65.8%) 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: Yamaha CW 50 NG Org reliability, failures and mileage · ranked #4542 of 5428 models· other Yamaha models: YZF-R1, YZF-R6, FZS600, YBR 125, XJR1300, FZ6