Mutt QM 250-2X Mongrel 250 vs Yamaha WR250F

The Mutt QM 250-2X Mongrel 250 passes its MOT first time more often than the Yamaha WR250F: 84.5% vs 78.0%, a 6.5-point lead.

MOT reliability, side by side

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

Metric	Mutt QM 250-2X Mongrel 250	Yamaha WR250F
First-time pass rate	84.5%	78.0%
Outright fail rate	7.1%	12.8%
Vs comparable bikes (age & mileage adjusted)	-4.4 pts	-10.7 pts
Engine size	249cc	249cc
Rank among all models	#2613 of 5428	#3913 of 5428
Median miles at test	2,840	3,018
MOT tests analysed	453	10,465
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 QM 250-2X Mongrel 250	Yamaha WR250F
2021	81.0%	80.4%
2022	86.8%	76.2%
2023	84.2%	82.1%
2024	85.0%	80.2%
2025	83.7%	81.6%

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

MUTT QM 250-2X MONGREL 250 84.5% pass · 453 tests YAMAHA WR250F 78.0% pass · 10.5k tests

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