YAMAHA DT

124cc Petrol Class 1

#4673 of 5426 overall #358 of 409 YAMAHAs #349 of 734 commuter bikes

70.8%

first-time pass rate

19.5%

failed outright

16,174

median miles at test

1,442

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2005–2019

The DT's first-time pass rate has risen 17.7 points since 2005, 63.6% to 81.3%.

Pass rate by mileage

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

A low-mileage DT passes first time 78.7% of the time; by 40k that's 70.3%.

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 DT

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lighting and signalling	388	39.2	3.0×
steering and suspension	183	18.5	2.6×
brakes	134	13.5	1.6×
tyres and wheels	85	8.6	2.0×
drive system	64	6.5	4.2×
lamps and reflectors	38	3.8	0.9×
fuel and exhaust	30	3	2.5×
body and structure	29	2.9	2.9×
reg plates and vin	21	2.1	2.2×
structure and attachments	17	1.7	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 DT beats 0 of its 4 closest rivals (YAMAHA YBR 125, HONDA CG125, HONDA CBF125).

YAMAHA YBR 125 71.0% pass · 125k tests HONDA CG125 72.2% pass · 89.3k tests HONDA CBF125 73.3% pass · 84.4k tests GILERA RUNNER 70.8% pass · 69.9k 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 DT.

Pass rate by registration year

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

Best year to buy used: 1978 (91.7% pass). Weakest: 1990 (58.4%).

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 DT FAQ

answers computed from the data above · terms in the glossary

Is the YAMAHA DT reliable?

The YAMAHA DT is less reliable than average for its class: 70.8% of its 1,442 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4673 of 5426 models.

What does a DT fail its MOT on most?

lighting and signalling — 39% of all defects recorded against failed DT tests.

What is the best year of DT to buy used?

By first-time pass rate, 1978-registered examples do best (91.7%) and 1990 worst (58.4%). Condition and history still trump the year.

How many miles will a DT last?

The median DT shows 16,174 miles at test, and examples around 40k miles still pass 70.3% of the time — mileage alone rarely kills one.