Data as of: DVSA MOT results to 2025
The pass rate is the MOT first-time pass: a roadworthiness check of the items an MOT covers (brakes, lights, tyres, steering, structure, emissions), not a full mechanical inspection of engine or gearbox internals. It is a reliability signal, not a complete measure of mechanical reliability. What this measures.
“vs expected” adjusts for age, mileage and test class, so a cherished classic and a hard-used commuter are compared fairly. How this works.
Pass rate over time
The YH 50's first-time pass rate has fallen 7.3 points since 2005, 84.0% to 76.7%.
Pass rate by mileage
A low-mileage YH 50 passes first time 76.8% of the time; by 20k that's 70.1%.
First-time pass rate by odometer reading at test, 10,000-mile bands for this model. Mileage is the strongest reliability signal. See the full curve.
What fails on a YH 50
| Component group | Share of defects | Defects | % of defects | vs all bikes |
|---|---|---|---|---|
| lighting and signalling |
|
408 | 34.2 | 2.4× |
| steering and suspension |
|
315 | 26.4 | 2.9× |
| brakes |
|
182 | 15.3 | 1.3× |
| tyres and wheels |
|
95 | 8 | 1.5× |
| fuel and exhaust |
|
79 | 6.6 | 3.7× |
| body and structure |
|
40 | 3.4 | 3.0× |
| lamps and reflectors |
|
29 | 2.4 | 0.4× |
| suspension |
|
21 | 1.8 | 0.9× |
| reg plates and vin |
|
14 | 1.2 | 0.8× |
| tyres |
|
9 | 0.8 | 0.4× |
Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects. "vs all bikes" is how often this model's tests record a defect in the group, as a multiple of the all-bike rate.
How rivals compare
On first-time pass rate the YH 50 beats 4 of its 4 closest rivals (PEUGEOT SPEEDFIGHT, PIAGGIO ZIP, PIAGGIO NRG).
Rivals share this bike's type and sit within ±30% of its engine capacity, ≥ 5,000 tests. Card colour = better/worse first-time pass rate than the YH 50.
Compare with any bike
More YAMAHA models
Pass rate by registration year
Highest pass rate: 2007 (84.3%). Lowest: 2001 (69.1%). Every YH 50 year compared →
First-time pass rate by the year each bike was first registered (cohorts with ≥ 50 tests). Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.
YAMAHA YH 50 FAQ
Is the YAMAHA YH 50 reliable?
The YAMAHA YH 50 is about average for its class: 73.9% of its 2,505 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4407 of 5428 models.
What does a YH 50 fail its MOT on most?
lighting and signalling: 34% of all defects recorded against failed YH 50 tests.
What is the best year of YH 50 to buy used?
By first-time pass rate, 2007-registered examples do best (84.3%) and 2001 worst (69.1%). Condition and history still trump the year.
How many miles will a YH 50 last?
The median YH 50 shows 7,324 miles at test, and examples around 20k miles still pass 70.1% of the time, so mileage alone rarely decides the result.
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