Zontes ZT 125-5A Monster vs Honda CB125F

The Honda CB125F passes its MOT first time more often than the Zontes ZT 125-5A Monster: 81.2% vs 57.6%, a 23.6-point lead.

MOT reliability, side by side

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

Metric	Zontes ZT 125-5A Monster	Honda CB125F
First-time pass rate	57.6%	81.2%
Outright fail rate	32.6%	11.1%
Vs comparable bikes (age & mileage adjusted)	-14.3 pts	+4.9 pts
Engine size	125cc	125cc
Rank among all models	#5288 of 5428	#3336 of 5428
Median miles at test	9,587	8,847
MOT tests analysed	264	30,606
Most common failure	lighting and signalling	structure and attachments

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 mileage

first-time MOT pass rate by miles on the clock at test

Mileage	Zontes ZT 125-5A Monster	Honda CB125F
0k-10k miles	62.2%	86.2%
10k-20k miles	54.6%	75.7%

Bands with fewer than 30 tests for either bike are left out.

ZONTES ZT 125-5A MONSTER 57.6% pass · 264 tests HONDA CB125F 81.2% pass · 30.6k tests

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