MUTT MASTIFF 125

125cc Petrol Class 1

#4868 of 5426 overall #6 of 6 MUTTs #449 of 734 commuter bikes

67.8%

first-time pass rate

22.9%

failed outright

3,153

median miles at test

214

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2023–2025

The MASTIFF 125's first-time pass rate has fallen 13.6 points since 2023, 82.4% to 68.8%.

What fails on a MASTIFF 125

failure defects by component group · advisories excluded

Component group	Defects	% of defects
lamps and reflectors	68	49.6
brakes	26	19
structure and attachments	22	16.1
suspension	7	5.1
steering	6	4.4
audible warning (Horn)	5	3.6
wheels	1	0.7
tyres	1	0.7
Identification of the vehicle	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 MASTIFF 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 MASTIFF 125.

Pass rate by registration year

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

Best year to buy used: 2020 (74.7% pass). Weakest: 2021 (62.1%).

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.