BIKERELIABILITY Reg check
League table/ MZ/ETZ150
Model report · 2005–2025

MZ ETZ150

143cc Petrol Class 1
90.8%
first-time pass rate
4.6%
failed outright
19,827
median miles at test
130
MOT tests, 2005–2025
+14.3pp
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 ETZ150

failure defects by component group · advisories excluded
Component group Share of defects Defects % of defects
lighting and signalling
4 36.4
brakes
3 27.3
body and structure
1 9.1
lamps and reflectors
1 9.1
steering and suspension
1 9.1
tyres and wheels
1 9.1

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 ETZ150 beats 1 of its 1 closest rivals (BSA BANTAM).

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 ETZ150.

Compare with any bike

rival not listed above? pick any model to see it head-to-head with the ETZ150

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