Ducati M821 vs Suzuki GSF600

The Ducati M821 passes its MOT first time more often than the Suzuki GSF600: 88.5% vs 77.3%, a 11.2-point lead.

MOT reliability, side by side

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

Metric	Ducati M821	Suzuki GSF600
First-time pass rate	88.5%	77.3%
Outright fail rate	5.7%	14.2%
Vs comparable bikes (age & mileage adjusted)	-0.7 pts	-6.1 pts
Engine size	821cc	599cc
Rank among all models	#1449 of 5428	#4013 of 5428
Median miles at test	5,224	21,080
MOT tests analysed	1,907	143,023
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.

"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.

What fails, side by side

share of each bike's MOT tests that failed on the component · lower is better

Component	Ducati M821	Suzuki GSF600
Brakes	3.5%	6.1%
Lights & signalling	1.8%	6.7%
Steering & suspension	0.6%	3.6%
Tyres & wheels	0.4%	3.3%
Structure & body	0.7%	1.5%
Drive system	0%	1.4%
Fuel & exhaust	0%	1.2%

A test that fails on two components counts once in each. Component links go to the bikes most likely to fail on it.

Pass rate by test year

first-time MOT pass rate in each calendar year both bikes were tested

Test year	Ducati M821	Suzuki GSF600
2020	90.5%	77.8%
2021	88.3%	76.8%
2022	88.4%	78.1%
2023	89.3%	78.2%
2024	88.0%	78.9%
2025	87.7%	79.6%

Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.

Pass rate by mileage

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

Mileage	Ducati M821	Suzuki GSF600
0k-10k miles	89.4%	86.8%
10k-20k miles	82.4%	80.1%
20k-30k miles	87.5%	75.2%

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

Ducati M821 vs Suzuki GSF600 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Ducati M821 or the Suzuki GSF600?

The Ducati M821 passes its MOT first time more often than the Suzuki GSF600: 88.5% vs 77.3%, a 11.2-point lead. Adjusted for age, mileage and test class, the Ducati M821 still comes out ahead: -0.7 points vs comparable bikes for the Ducati M821, -6.1 for the Suzuki GSF600. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Ducati M821 fail its MOT on most?

Brakes: 3.5% of Ducati M821 MOT tests failed on it, then lights & signalling (1.8%).

What does the Suzuki GSF600 fail its MOT on most?

Lights & signalling: 6.7% of Suzuki GSF600 MOT tests failed on it, then brakes (6.1%).

Which holds up better at high mileage, the Ducati M821 or the Suzuki GSF600?

At 20k-30k miles the Ducati M821 passes first time more often: 87.5% for the Ducati M821 vs 75.2% for the Suzuki GSF600.

DUCATI M821 88.5% pass · 1,907 tests SUZUKI GSF600 77.3% pass · 143k tests

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