Betamotor Alp 4T vs Yamaha WR250F

The Betamotor Alp 4T passes its MOT first time more often than the Yamaha WR250F: 80.8% vs 78.0%, a 2.8-point lead.

MOT reliability, side by side

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

Metric	Betamotor Alp 4T	Yamaha WR250F
First-time pass rate	80.8%	78.0%
Outright fail rate	7.4%	12.8%
Vs comparable bikes (age & mileage adjusted)	+1.1 pts	-10.7 pts
Engine size	199cc	249cc
Rank among all models	#3418 of 5428	#3913 of 5428
Median miles at test	3,449	3,018
MOT tests analysed	825	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	Betamotor Alp 4T	Yamaha WR250F
Lights & signalling	4.6%	8.2%
Steering & suspension	2.3%	5.1%
Brakes	2.1%	2.2%
Tyres & wheels	1.2%	3.0%
Structure & body	0.5%	0.5%
Drive system	0.1%	0.7%
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	Betamotor Alp 4T	Yamaha WR250F
2018	82.2%	79.2%
2019	79.6%	77.2%
2020	72.5%	82.5%
2021	79.4%	80.4%
2022	82.8%	76.2%
2023	80.3%	82.1%
2024	80.0%	80.2%
2025	82.8%	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	Betamotor Alp 4T	Yamaha WR250F
0k-10k miles	80.9%	78.1%
10k-20k miles	91.5%	77.3%

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

Betamotor Alp 4T vs Yamaha WR250F FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Betamotor Alp 4T or the Yamaha WR250F?

The Betamotor Alp 4T passes its MOT first time more often than the Yamaha WR250F: 80.8% vs 78.0%, a 2.8-point lead. Adjusted for age, mileage and test class, the Betamotor Alp 4T still comes out ahead: +1.1 points vs comparable bikes for the Betamotor Alp 4T, -10.7 for the Yamaha WR250F. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Betamotor Alp 4T fail its MOT on most?

Lights & signalling: 4.6% of Betamotor Alp 4T MOT tests failed on it, then steering & suspension (2.3%).

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%).

BETAMOTOR ALP 4T 80.8% pass · 825 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.