MZ ETZ300 vs Yamaha WR250F

The MZ ETZ300 passes its MOT first time more often than the Yamaha WR250F: 85.9% vs 78.0%, a 7.9-point lead.

MOT reliability, side by side

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

Metric	MZ ETZ300	Yamaha WR250F
First-time pass rate	85.9%	78.0%
Outright fail rate	5.3%	12.8%
Vs comparable bikes (age & mileage adjusted)	+3.0 pts	-10.7 pts
Engine size	291cc	249cc
Rank among all models	#2232 of 5428	#3913 of 5428
Median miles at test	26,569	3,018
MOT tests analysed	304	10,465
Most common failure	lighting and signalling	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 mileage

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

Mileage	MZ ETZ300	Yamaha WR250F
0k-10k miles	91.9%	78.1%
10k-20k miles	89.8%	77.3%
20k-30k miles	86.7%	67.9%

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

MZ ETZ300 85.9% pass · 304 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.