Jawa 350/639 vs Suzuki DR-Z400S

The Jawa 350/639 passes its MOT first time more often than the Suzuki DR-Z400S — 85.2% vs 80.4%, a 4.8-point lead.

MOT reliability, side by side

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

Metric	Jawa 350/639	Suzuki DR-Z400S
First-time pass rate	85.2%	80.4%
Outright fail rate	7.8%	11.1%
Median miles at test	11,178	6,940
MOT tests analysed	769	26,773
Most common failure	lighting and signalling	lighting and signalling

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.

JAWA 350/639 85.2% pass · 769 tests SUZUKI DR-Z400S 80.4% pass · 26.8k tests

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