MZ Scorpion vs Yamaha FZS600

The Yamaha FZS600 passes its MOT first time more often than the MZ Scorpion: 82.6% vs 81.7%, a 0.9-point lead.

MOT reliability, side by side

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

Metric	MZ Scorpion	Yamaha FZS600
First-time pass rate	81.7%	82.6%
Outright fail rate	14.2%	10.6%
Vs comparable bikes (age & mileage adjusted)	-1.1 pts	-0.8 pts
Engine size	660cc	599cc
Median miles at test	24,888	21,612
MOT tests analysed	169	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.

"Vs comparable bikes" is the first-time pass rate minus the rate expected for each bike's own mix of age, mileage and test class, in percentage points: positive means better than comparable bikes. How this works.

Pass rate by mileage

first-time MOT pass rate by miles on the clock at test

Mileage	MZ Scorpion	Yamaha FZS600
10k-20k miles	80.6%	85.5%
20k-30k miles	67.5%	81.4%
30k-40k miles	89.7%	78.7%

Bands with fewer than 30 tests for either bike are left out.

MZ SCORPION 81.7% pass · 169 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.