Bsa C11 vs Yamaha WR250F

The Bsa C11 passes its MOT first time more often than the Yamaha WR250F: 86.9% vs 78.0%, a 8.9-point lead.

MOT reliability, side by side

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

Metric	Bsa C11	Yamaha WR250F
First-time pass rate	86.9%	78.0%
Outright fail rate	7.2%	12.8%
Engine size	250cc	249cc
Rank among all models	#1937 of 5428	#3913 of 5428
Median miles at test	9,950	3,018
MOT tests analysed	458	10,465
Most common failure	steering and suspension	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.

Pass rate by test year

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

Test year	Bsa C11	Yamaha WR250F
2006	93.2%	76.7%
2007	78.9%	73.3%
2008	91.2%	78.2%
2009	89.3%	73.9%
2010	87.9%	75.3%
2011	78.2%	76.7%
2012	91.1%	76.5%

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

Pass rate by mileage

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

Mileage	Bsa C11	Yamaha WR250F
0k-10k miles	84.8%	78.1%
10k-20k miles	86.2%	77.3%
20k-30k miles	89.5%	67.9%

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

BSA C11 86.9% pass · 458 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.