ZENNCO YB 125

125cc Petrol Class 1

43.0%

first-time pass rate

46.6%

failed outright

6,123

median miles at test

193

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2011–2013

The YB 125's first-time pass rate has fallen 10.3 points since 2011, 47.8% to 37.5%.

What fails on a YB 125

failure defects by component group · advisories excluded

Component group	Defects	% of defects
lighting and signalling	119	32.9
steering and suspension	102	28.2
brakes	35	9.7
drive system	31	8.6
tyres and wheels	22	6.1
body and structure	17	4.7
fuel and exhaust	14	3.9
lamps and reflectors	9	2.5
reg plates and vin	8	2.2
driving controls	5	1.4

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 YB 125 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 YB 125.

Pass rate by registration year

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

Best year to buy used: 2008 (43.4% pass). Weakest: 2008 (43.4%).

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.