Mutt Fat Sabbath 125: MOT pass rate by registration year

Which Fat Sabbath 125 years pass first time, and which fall short of the model's 69.7% average, from 591 DVSA tests.

2020

highest-passing year · 72.5%

2021

lowest-passing year · 65.7%

6.8pp

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: 2020 (72.5% of 207 tests). Lowest: 2021 (65.7% of 172). Years more than two points below the model average: 2021, 2022.

Registered	Tests	First-time pass	vs model (69.7%)
2019	123	72.4%	+2.7 pp
2020	207	72.5%	+2.8 pp
2021	172	65.7%	-4.0 pp
2022	88	67.0%	-2.7 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 · 2022–2025

Questions

Which Fat Sabbath 125 years have the lowest MOT pass rate?: 2021, 2022 registered examples pass first time less often than the Mutt Fat Sabbath 125 overall (69.7%); the 2021 cohort is lowest at 65.7% from 172 tests.
Which Fat Sabbath 125 year has the highest MOT pass rate?: 2020, at 72.5% of 207 first tests (2005–2025). Years more than two points above the model average: 2019, 2020.
How much does the Fat Sabbath 125 pass rate vary by year?: 6.8 percentage points between the highest (2020, 72.5%) and lowest (2021, 65.7%) 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: Mutt Fat Sabbath 125 reliability, failures and mileage · ranked #4760 of 5428 models· other Mutt models: Mongrel 125, QM 250-2X Mongrel 250, Hilts 125, Akita 125, Mastiff 125, Desert Racer 125