Data as of: DVSA MOT results to 2025
YAMAHA YN100
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 YN100's first-time pass rate has risen 8.5 points since 2005, 71.5% to 80.0%.
Pass rate by mileage
A low-mileage YN100 passes first time 73.2% of the time; by 20k that's 63.9%.
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 YN100
| Component group | Share of defects | Defects | % of defects | vs all bikes |
|---|---|---|---|---|
| lighting and signalling |
|
1,074 | 35.8 | 3.0× |
| brakes |
|
716 | 23.9 | 2.2× |
| steering and suspension |
|
463 | 15.4 | 2.2× |
| tyres and wheels |
|
293 | 9.8 | 2.2× |
| fuel and exhaust |
|
197 | 6.6 | 4.2× |
| lamps and reflectors |
|
110 | 3.7 | 0.7× |
| body and structure |
|
70 | 2.3 | 2.5× |
| reg plates and vin |
|
29 | 1 | 0.8× |
| tyres |
|
25 | 0.8 | 0.5× |
| Items Not Tested |
|
22 | 0.7 | 4.1× |
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 YN100 beats 0 of its 4 closest rivals (YAMAHA YBR 125, HONDA C90, HONDA CG125).
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 YN100.
Compare with any bike
More YAMAHA models
Pass rate by registration year
Highest pass rate: 2005 (79.5%). Lowest: 2001 (68.1%). Every YN100 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 YN100 FAQ
Is the YAMAHA YN100 reliable?
The YAMAHA YN100 is less reliable than average for its class: 70.2% of its 5,341 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4717 of 5428 models.
What does a YN100 fail its MOT on most?
lighting and signalling: 36% of all defects recorded against failed YN100 tests.
What is the best year of YN100 to buy used?
By first-time pass rate, 2005-registered examples do best (79.5%) and 2001 worst (68.1%). Condition and history still trump the year.
How many miles will a YN100 last?
The median YN100 shows 7,689 miles at test, and examples around 20k miles still pass 63.9% of the time, so mileage alone rarely decides the result.
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