YAMAHA DT 125 RE

124cc Petrol Class 1

#4806 of 5426 overall #375 of 409 YAMAHAs #418 of 734 commuter bikes

68.8%

first-time pass rate

19.8%

failed outright

9,617

median miles at test

510

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2008–2016

The DT 125 RE's first-time pass rate has fallen 10.1 points since 2008, 84.4% to 74.3%.

Pass rate by mileage

how the DT 125 RE's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage DT 125 RE passes first time 72.5% of the time; by 20k that's 65.9%.

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 DT 125 RE

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lighting and signalling	70	22.2	1.8×
tyres and wheels	68	21.6	4.2×
brakes	51	16.2	1.7×
steering and suspension	34	10.8	1.7×
drive system	31	9.8	5.4×
lamps and reflectors	26	8.3	1.9×
structure and attachments	12	3.8	2.3×
reg plates and vin	11	3.5	3.4×
wheels	6	1.9	16.3×
fuel and exhaust	6	1.9	1.3×

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 125 RE 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 125 RE.

Pass rate by registration year

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

Best year to buy used: 2004 (70.8% pass). Weakest: 2006 (65.6%).

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 125 RE FAQ

answers computed from the data above · terms in the glossary

Is the YAMAHA DT 125 RE reliable?

The YAMAHA DT 125 RE is less reliable than average for its class: 68.8% of its 510 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4806 of 5426 models.

What does a DT 125 RE fail its MOT on most?

lighting and signalling — 22% of all defects recorded against failed DT 125 RE tests.

What is the best year of DT 125 RE to buy used?

By first-time pass rate, 2004-registered examples do best (70.8%) and 2006 worst (65.6%). Condition and history still trump the year.

How many miles will a DT 125 RE last?

The median DT 125 RE shows 9,617 miles at test, and examples around 20k miles still pass 65.9% of the time — mileage alone rarely kills one.