YAMAHA YN100

101cc Petrol Class 1

#4715 of 5426 overall #361 of 409 YAMAHAs #372 of 734 commuter bikes

70.2%

first-time pass rate

21.0%

failed outright

7,689

median miles at test

5,341

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2005–2025

The YN100's first-time pass rate has risen 8.5 points since 2005, 71.5% to 80.0%.

Pass rate by mileage

how the YN100's first-time pass rate falls with the odometer · class average 73.4%

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

failure defects by component group · advisories excluded

Component group	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

same type, similar capacity, high test volume

On first-time pass rate the YN100 beats 0 of its 4 closest rivals (YAMAHA YBR 125, HONDA C90, HONDA CG125).

YAMAHA YBR 125 71.0% pass · 125k tests HONDA C90 79.3% pass · 92.8k tests HONDA CG125 72.2% pass · 89.3k tests HONDA CBF125 73.3% pass · 84.4k tests

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.

Pass rate by registration year

how each model-year cohort fares · registration year from first use date

Best year to buy used: 2005 (79.5% pass). Weakest: 2001 (68.1%).

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

answers computed from the data above · terms in the glossary

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 #4715 of 5426 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 — mileage alone rarely kills one.