Velocette MSS: MOT pass rate by registration year

Which MSS years pass first time, and which fall short of the model's 95.2% average, from 1,232 DVSA tests.

1955

highest-passing year · 98.1%

1960

lowest-passing year · 93.5%

4.6pp

spread across 7 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: 1955 (98.1% of 160 tests). Lowest: 1960 (93.5% of 138).

Registered	Tests	First-time pass	vs model (95.2%)
1954	178	94.9%	-0.3 pp
1955	160	98.1%	+2.9 pp
1956	101	96.0%	+0.8 pp
1957	67	94.0%	-1.2 pp
1959	62	95.2%	+0.0 pp
1960	138	93.5%	-1.7 pp
1962	50	98.0%	+2.8 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 · 2005–2016

Questions

Which MSS years have the lowest MOT pass rate?: none: no registration year of the Velocette MSS falls more than two points under the model's 95.2% overall pass rate.
Which MSS year has the highest MOT pass rate?: 1955, at 98.1% of 160 first tests (2005–2025). Years more than two points above the model average: 1955, 1962.
How much does the MSS pass rate vary by year?: 4.6 percentage points between the highest (1955, 98.1%) and lowest (1960, 93.5%) 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: Velocette MSS reliability, failures and mileage · ranked #62 of 5428 models· other Velocette models: Venom, Viper, Le, Mac, Thruxton, KSS