TRIUMPH SPEED FOUR vs YAMAHA FZS600

The YAMAHA FZS600 passes its MOT first time more often than the TRIUMPH SPEED FOUR — 82.6% vs 81.4%, a 1.2-point lead.

MOT reliability, side by side

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

Metric	TRIUMPH SPEED FOUR	YAMAHA FZS600
First-time pass rate	81.4%	82.6%
Outright fail rate	11.3%	10.6%
Median miles at test	14,114	21,612
MOT tests analysed	8,421	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.

TRIUMPH SPEED FOUR 81.4% pass · 8,421 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.