Yamaha WR450F vs Suzuki AN400

The Suzuki AN400 passes its MOT first time more often than the Yamaha WR450F: 86.2% vs 78.0%, a 8.2-point lead.

MOT reliability, side by side

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

Metric	Yamaha WR450F	Suzuki AN400
First-time pass rate	78.0%	86.2%
Outright fail rate	13.0%	9.8%
Vs comparable bikes (age & mileage adjusted)	-10.6 pts	+1.3 pts
Engine size	449cc	385cc
Rank among all models	#3913 of 5428	#2148 of 5428
Median miles at test	3,085	15,861
MOT tests analysed	9,518	27,056
Most common failure	lighting and signalling	brakes

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	Yamaha WR450F	Suzuki AN400
Lights & signalling	8.5%	2.6%
Steering & suspension	5.0%	2.3%
Brakes	2.2%	4.4%
Tyres & wheels	3.0%	3.2%
Fuel & exhaust	0.7%	0.4%
Structure & body	0.6%	0.3%
Drive system	0.8%	0%

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	Yamaha WR450F	Suzuki AN400
2018	82.0%	85.7%
2019	78.0%	84.4%
2020	84.0%	84.5%
2021	83.0%	85.1%
2022	79.0%	83.0%
2023	81.5%	83.0%
2024	83.4%	83.1%
2025	81.6%	86.9%

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	Yamaha WR450F	Suzuki AN400
0k-10k miles	78.2%	91.7%
10k-20k miles	78.8%	86.7%

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

Yamaha WR450F vs Suzuki AN400 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Yamaha WR450F or the Suzuki AN400?

The Suzuki AN400 passes its MOT first time more often than the Yamaha WR450F: 86.2% vs 78.0%, a 8.2-point lead. Adjusted for age, mileage and test class, the Suzuki AN400 still comes out ahead: -10.6 points vs comparable bikes for the Yamaha WR450F, +1.3 for the Suzuki AN400. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Yamaha WR450F fail its MOT on most?

Lights & signalling: 8.5% of Yamaha WR450F MOT tests failed on it, then steering & suspension (5.0%).

What does the Suzuki AN400 fail its MOT on most?

Brakes: 4.4% of Suzuki AN400 MOT tests failed on it, then tyres & wheels (3.2%).

YAMAHA WR450F 78.0% pass · 9,518 tests SUZUKI AN400 86.2% pass · 27.1k tests

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