Royal Enfield Constellation vs Suzuki GSF600

The Royal Enfield Constellation passes its MOT first time more often than the Suzuki GSF600: 89.8% vs 77.3%, a 12.5-point lead.

MOT reliability, side by side

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

Metric	Royal Enfield Constellation	Suzuki GSF600
First-time pass rate	89.8%	77.3%
Outright fail rate	3.1%	14.2%
Engine size	700cc	599cc
Rank among all models	#1025 of 5428	#4013 of 5428
Median miles at test	19,251	21,080
MOT tests analysed	413	143,023
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.

Pass rate by test year

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

Test year	Royal Enfield Constellation	Suzuki GSF600
2006	94.7%	81.8%
2007	90.0%	80.0%
2008	92.7%	78.4%
2009	82.5%	75.8%
2010	89.4%	75.8%
2011	91.7%	76.1%
2012	84.6%	75.9%

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	Royal Enfield Constellation	Suzuki GSF600
0k-10k miles	87.9%	86.8%
10k-20k miles	89.1%	80.1%
20k-30k miles	90.1%	75.2%
40k-50k miles	91.5%	69.4%

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

ROYAL ENFIELD CONSTELLATION 89.8% pass · 413 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.