YAMAHA YB100

97cc Petrol Class 1

#4478 of 5426 overall #344 of 409 YAMAHAs #284 of 734 commuter bikes

73.2%

first-time pass rate

16.8%

failed outright

16,520

median miles at test

2,487

MOT tests, 2005–2025

Pass rate over time

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

The YB100's first-time pass rate has risen 9.5 points since 2005, 74.7% to 84.2%.

Pass rate by mileage

how the YB100's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage YB100 passes first time 78.5% of the time; by 40k that's 78.6%.

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 YB100

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lighting and signalling	699	47.6	2.9×
steering and suspension	278	18.9	2.2×
tyres and wheels	138	9.4	2.2×
brakes	125	8.5	0.9×
fuel and exhaust	57	3.9	2.7×
drive system	56	3.8	2.3×
lamps and reflectors	47	3.2	0.5×
body and structure	33	2.2	2.4×
driving controls	18	1.2	3.1×
reg plates and vin	17	1.2	1.1×

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 YB100 beats 2 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 YB100.

Pass rate by registration year

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

Best year to buy used: 1976 (88.1% pass). Weakest: 1993 (61.3%).

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 YB100 FAQ

answers computed from the data above · terms in the glossary

Is the YAMAHA YB100 reliable?

The YAMAHA YB100 is about average for its class: 73.2% of its 2,487 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4478 of 5426 models.

What does a YB100 fail its MOT on most?

lighting and signalling — 48% of all defects recorded against failed YB100 tests.

What is the best year of YB100 to buy used?

By first-time pass rate, 1976-registered examples do best (88.1%) and 1993 worst (61.3%). Condition and history still trump the year.

How many miles will a YB100 last?

The median YB100 shows 16,520 miles at test, and examples around 40k miles still pass 78.6% of the time — mileage alone rarely kills one.