Mutt Mastiff 125 vs Honda CG125

The Honda CG125 passes its MOT first time more often than the Mutt Mastiff 125: 72.2% vs 67.8%, a 4.4-point lead.

MOT reliability, side by side

first-time pass rate, outright fail rate and tests analysed · 2005–2025

Metric	Mutt Mastiff 125	Honda CG125
First-time pass rate	67.8%	72.2%
Outright fail rate	22.9%	16.8%
Vs comparable bikes (age & mileage adjusted)	-10.1 pts	+0.7 pts
Engine size	125cc	124cc
Rank among all models	#4870 of 5428	#4568 of 5428
Median miles at test	3,153	17,460
MOT tests analysed	214	89,345
Most common failure	lamps and reflectors	lighting and signalling

First-time outcomes on normal tests, 2005–2025. "Most common failure" is the component group with the most recorded defects on failed tests. Read pass rates against test counts: a smaller sample is noisier. Source: DVSA anonymised MOT results.

"Vs comparable bikes" is the first-time pass rate minus the rate expected for each bike's own mix of age, mileage and test class, in percentage points: positive means better than comparable bikes. How this works.

Pass rate by test year

first-time MOT pass rate in each calendar year both bikes were tested

Test year	Mutt Mastiff 125	Honda CG125
2023	82.4%	74.4%
2024	58.8%	73.0%
2025	68.8%	76.4%

Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.

MUTT MASTIFF 125 67.8% pass · 214 tests HONDA CG125 72.2% pass · 89.3k tests

See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.