Harley-Davidson Flstc Heritage STC 1690 17: MOT pass rate by registration year

Which Flstc Heritage STC 1690 17 years pass first time, and which fall short of the model's 92.7% average, from 579 DVSA tests.

2016

highest-passing year · 94.2%

2018

lowest-passing year · 90.8%

3.4pp

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: 2016 (94.2% of 52 tests). Lowest: 2018 (90.8% of 87).

Registered	Tests	First-time pass	vs model (92.7%)
2016	52	94.2%	+1.5 pp
2017	438	92.9%	+0.2 pp
2018	87	90.8%	-1.9 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 · 2020–2025

Questions

Which Flstc Heritage STC 1690 17 years have the lowest MOT pass rate?: none: no registration year of the Harley-Davidson Flstc Heritage STC 1690 17 falls more than two points under the model's 92.7% overall pass rate.
Which Flstc Heritage STC 1690 17 year has the highest MOT pass rate?: 2016, at 94.2% of 52 first tests (2005–2025).
How much does the Flstc Heritage STC 1690 17 pass rate vary by year?: 3.4 percentage points between the highest (2016, 94.2%) and lowest (2018, 90.8%) 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: Harley-Davidson Flstc Heritage STC 1690 17 reliability, failures and mileage · ranked #344 of 5428 models· other Harley-Davidson models: XLH 883, Flstf, Flstc, XL, XL1200C, XL883