Gilera GP 800 vs Suzuki GSF600

The Gilera GP 800 passes its MOT first time more often than the Suzuki GSF600: 82.6% vs 77.3%, a 5.3-point lead.

MOT reliability, side by side

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

Metric	Gilera GP 800	Suzuki GSF600
First-time pass rate	82.6%	77.3%
Outright fail rate	12.2%	14.2%
Vs comparable bikes (age & mileage adjusted)	-2.0 pts	-6.1 pts
Engine size	839cc	599cc
Rank among all models	#3052 of 5428	#4013 of 5428
Median miles at test	18,404	21,080
MOT tests analysed	690	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	Gilera GP 800	Suzuki GSF600
Lights & signalling	5.2%	6.7%
Brakes	4.8%	6.1%
Steering & suspension	4.1%	3.6%
Tyres & wheels	3.2%	3.3%
Structure & body	1.0%	1.5%
Drive system	1.0%	1.4%
Fuel & exhaust	0.1%	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	Gilera GP 800	Suzuki GSF600
2015	82.7%	75.5%
2016	89.6%	76.1%
2017	77.6%	77.0%
2018	86.1%	77.7%
2019	71.0%	76.7%
2021	91.4%	76.8%
2022	70.6%	78.1%
2023	84.4%	78.2%

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	Gilera GP 800	Suzuki GSF600
0k-10k miles	88.4%	86.8%
10k-20k miles	82.6%	80.1%
20k-30k miles	82.0%	75.2%
30k-40k miles	75.3%	71.3%
40k-50k miles	81.4%	69.4%

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

Gilera GP 800 vs Suzuki GSF600 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Gilera GP 800 or the Suzuki GSF600?

The Gilera GP 800 passes its MOT first time more often than the Suzuki GSF600: 82.6% vs 77.3%, a 5.3-point lead. Adjusted for age, mileage and test class, the Gilera GP 800 still comes out ahead: -2.0 points vs comparable bikes for the Gilera GP 800, -6.1 for the Suzuki GSF600. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Gilera GP 800 fail its MOT on most?

Lights & signalling: 5.2% of Gilera GP 800 MOT tests failed on it, then brakes (4.8%).

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 Gilera GP 800 or the Suzuki GSF600?

At 40k-50k miles the Gilera GP 800 passes first time more often: 81.4% for the Gilera GP 800 vs 69.4% for the Suzuki GSF600.

GILERA GP 800 82.6% pass · 690 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.