Yamaha WR450F vs Kawasaki ER5

The Yamaha WR450F passes its MOT first time more often than the Kawasaki ER5 — 78.0% vs 77.4%, a 0.6-point lead.

MOT reliability, side by side

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

Metric	Yamaha WR450F	Kawasaki ER5
First-time pass rate	78.0%	77.4%
Outright fail rate	13.0%	14.2%
Median miles at test	3,085	21,259
MOT tests analysed	9,518	53,115
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.

YAMAHA WR450F 78.0% pass · 9,518 tests KAWASAKI ER5 77.4% pass · 53.1k tests

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