BIKERELIABILITY Reg check
Model report · 2005–2025

YAMASAKI YM125-3

124cc Petrol Class 1
57.7%
first-time pass rate
28.8%
failed outright
5,513
median miles at test
104
MOT tests, 2005–2025
-17.1pp
vs expected · age & mileage

The pass rate is the MOT first-time pass: a roadworthiness check of the items an MOT covers (brakes, lights, tyres, steering, structure, emissions), not a full mechanical inspection of engine or gearbox internals. It is a reliability signal, not a complete measure of mechanical reliability. What this measures.

“vs expected” adjusts for age, mileage and test class, so a cherished classic and a hard-used commuter are compared fairly. How this works.

What fails on a YM125-3

failure defects by component group · advisories excluded
Component group Share of defects Defects % of defects
lighting and signalling
30 28
steering and suspension
30 28
brakes
16 15
tyres and wheels
10 9.3
body and structure
6 5.6
lamps and reflectors
5 4.7
fuel and exhaust
4 3.7
structure and attachments
3 2.8
drive system
2 1.9
steering
1 0.9

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 YM125-3 beats 0 of its 4 closest rivals (YAMAHA YBR 125, HONDA CG125, HONDA CBF125).

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 YM125-3.

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