BIKERELIABILITY Reg check
Registration-year report · 2005–2025

Data as of: DVSA MOT results to 2025

Yamaha XS850: MOT pass rate by registration year

Which XS850 years pass first time, and which fall short of the model's 81.2% average, from 751 DVSA tests.

1981
highest-passing year · 87.6%
1984
lowest-passing year · 76.2%
11.4pp
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: 1981 (87.6% of 153 tests). Lowest: 1984 (76.2% of 63). Years more than two points below the model average: 1984.

74%82%90%1980: 81.9% pass (381 tests)1981: 87.6% pass (153 tests)1984: 76.2% pass (63 tests)198019811984
RegisteredTestsFirst-time passvs model (81.2%)
1980 381 81.9% +0.7 pp
1981 153 87.6% +6.4 pp
1984 63 76.2% -5.0 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 · 2006–2017
66%80%94%2006: 83.6% pass (61 tests)2007: 71.0% pass (69 tests)2008: 81.7% pass (60 tests)2009: 75.9% pass (58 tests)2010: 77.9% pass (68 tests)2011: 80.0% pass (60 tests)2012: 85.7% pass (42 tests)2013: 83.0% pass (47 tests)2014: 85.4% pass (48 tests)2015: 84.8% pass (46 tests)2016: 73.2% pass (41 tests)2017: 89.2% pass (37 tests)20062017

Questions

Which XS850 years have the lowest MOT pass rate?
1984 registered examples pass first time less often than the Yamaha XS850 overall (81.2%); the 1984 cohort is lowest at 76.2% from 63 tests.
Which XS850 year has the highest MOT pass rate?
1981, at 87.6% of 153 first tests (2005–2025).
How much does the XS850 pass rate vary by year?
11.4 percentage points between the highest (1981, 87.6%) and lowest (1984, 76.2%) 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 XS850 reliability, failures and mileage · ranked #3336 of 5428 models· other Yamaha models: YZF-R1, YZF-R6, FZS600, YBR 125, XJR1300, FZ6