Derbi Mulhacen 659 vs Yamaha FZS600

The Derbi Mulhacen 659 passes its MOT first time more often than the Yamaha FZS600 — 87.4% vs 82.6%, a 4.8-point lead.

MOT reliability, side by side

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

Metric	Derbi Mulhacen 659	Yamaha FZS600
First-time pass rate	87.4%	82.6%
Outright fail rate	7.3%	10.6%
Median miles at test	5,330	21,612
MOT tests analysed	206	136,558
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.

DERBI MULHACEN 659 87.4% pass · 206 tests YAMAHA FZS600 82.6% pass · 137k tests

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