SANBEN WY 125 T-21

125cc Petrol Class 1

63.9%

first-time pass rate

24.7%

failed outright

6,418

median miles at test

166

MOT tests, 2005–2025

What fails on a WY 125 T-21

failure defects by component group · advisories excluded

Component group	Defects	% of defects
lighting and signalling	48	35.6
steering and suspension	45	33.3
brakes	22	16.3
tyres and wheels	7	5.2
fuel and exhaust	5	3.7
body and structure	3	2.2
driving controls	2	1.5
lamps and reflectors	1	0.7
Items Not Tested	1	0.7
steering	1	0.7

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the WY 125 T-21 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 WY 125 T-21.

Pass rate by registration year

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

Best year to buy used: 2006 (69.6% pass). Weakest: 2009 (64.1%).

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.