Beta Alp 4T-200 vs Yamaha WR250F

The Beta Alp 4T-200 passes its MOT first time more often than the Yamaha WR250F: 81.5% vs 78.0%, a 3.5-point lead.

MOT reliability, side by side

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

Metric	Beta Alp 4T-200	Yamaha WR250F
First-time pass rate	81.5%	78.0%
Outright fail rate	9.5%	12.8%
Vs comparable bikes (age & mileage adjusted)	+2.8 pts	-10.7 pts
Engine size	199cc	249cc
Rank among all models	#3270 of 5428	#3913 of 5428
Median miles at test	3,872	3,018
MOT tests analysed	1,144	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.

What fails, side by side

share of each bike's MOT tests that failed on the component · lower is better

Component	Beta Alp 4T-200	Yamaha WR250F
Lights & signalling	5.6%	8.2%
Steering & suspension	4.4%	5.1%
Brakes	2.8%	2.2%
Tyres & wheels	1.3%	3.0%
Drive system	0.6%	0.7%
Structure & body	0.6%	0.5%
Fuel & exhaust	0.1%	0.4%

A test that fails on two components counts once in each. Component links go to the bikes most likely to fail on it.

Pass rate by test year

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

Test year	Beta Alp 4T-200	Yamaha WR250F
2018	76.4%	79.2%
2019	72.7%	77.2%
2020	80.0%	82.5%
2021	80.0%	80.4%
2022	84.6%	76.2%
2023	83.0%	82.1%
2024	86.4%	80.2%
2025	78.9%	81.6%

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	Beta Alp 4T-200	Yamaha WR250F
0k-10k miles	82.0%	78.1%
10k-20k miles	82.5%	77.3%

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

Beta Alp 4T-200 vs Yamaha WR250F FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Beta Alp 4T-200 or the Yamaha WR250F?

The Beta Alp 4T-200 passes its MOT first time more often than the Yamaha WR250F: 81.5% vs 78.0%, a 3.5-point lead. Adjusted for age, mileage and test class, the Beta Alp 4T-200 still comes out ahead: +2.8 points vs comparable bikes for the Beta Alp 4T-200, -10.7 for the Yamaha WR250F. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Beta Alp 4T-200 fail its MOT on most?

Lights & signalling: 5.6% of Beta Alp 4T-200 MOT tests failed on it, then steering & suspension (4.4%).

What does the Yamaha WR250F fail its MOT on most?

Lights & signalling: 8.2% of Yamaha WR250F MOT tests failed on it, then steering & suspension (5.1%).

BETA ALP 4T-200 81.5% pass · 1,144 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.