Yamaha XT660Z: MOT pass rate by registration year

Which XT660Z years pass first time, and which fall short of the model's 82.8% average, from 657 DVSA tests.

2008

highest-passing year · 86.0%

2009

lowest-passing year · 82.9%

3.1pp

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: 2008 (86.0% of 129 tests). Lowest: 2009 (82.9% of 251).

Registered	Tests	First-time pass	vs model (82.8%)
2008	129	86.0%	+3.2 pp
2009	251	82.9%	+0.1 pp
2010	93	83.9%	+1.1 pp
2011	53	84.9%	+2.1 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 · 2012–2025

Questions

Which XT660Z years have the lowest MOT pass rate?: none: no registration year of the Yamaha XT660Z falls more than two points under the model's 82.8% overall pass rate.
Which XT660Z year has the highest MOT pass rate?: 2008, at 86.0% of 129 first tests (2005–2025). Years more than two points above the model average: 2008, 2011.
How much does the XT660Z pass rate vary by year?: 3.1 percentage points between the highest (2008, 86.0%) and lowest (2009, 82.9%) 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 XT660Z reliability, failures and mileage · ranked #3007 of 5428 models· other Yamaha models: YZF-R1, YZF-R6, FZS600, YBR 125, XJR1300, FZ6