SUZUKI GSF600 vs YAMAHA XT660R

The YAMAHA XT660R passes its MOT first time more often than the SUZUKI GSF600 — 86.9% vs 77.3%, a 9.6-point lead.

MOT reliability, side by side

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

Metric	SUZUKI GSF600	YAMAHA XT660R
First-time pass rate	77.3%	86.9%
Outright fail rate	14.2%	7.0%
Median miles at test	21,080	11,293
MOT tests analysed	143,023	7,787
Most common failure	brakes	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.

SUZUKI GSF600 77.3% pass · 143k tests YAMAHA XT660R 86.9% pass · 7,787 tests

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