Hyosung GT650 vs Yamaha FZS600

The Yamaha FZS600 passes its MOT first time more often than the Hyosung GT650: 82.6% vs 71.9%, a 10.7-point lead.

MOT reliability, side by side

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

Metric	Hyosung GT650	Yamaha FZS600
First-time pass rate	71.9%	82.6%
Outright fail rate	18.3%	10.6%
Vs comparable bikes (age & mileage adjusted)	-15.1 pts	-0.8 pts
Engine size	647cc	599cc
Rank among all models	#4591 of 5428	#3052 of 5428
Median miles at test	7,984	21,612
MOT tests analysed	739	136,558
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	Hyosung GT650	Yamaha FZS600
Brakes	8.9%	4.5%
Lights & signalling	9.5%	3.4%
Steering & suspension	5.1%	2.7%
Tyres & wheels	4.1%	2.9%
Drive system	1.8%	0.9%
Structure & body	1.1%	1.1%
Fuel & exhaust	0.4%	1.1%

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	Hyosung GT650	Yamaha FZS600
2013	65.3%	81.3%
2014	72.4%	81.2%
2015	81.7%	81.1%
2016	75.0%	82.2%
2017	64.0%	82.0%
2018	75.0%	81.3%
2021	73.5%	82.8%
2023	66.7%	84.2%

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	Hyosung GT650	Yamaha FZS600
0k-10k miles	74.6%	89.6%
10k-20k miles	66.7%	85.5%
20k-30k miles	76.5%	81.4%

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

Hyosung GT650 vs Yamaha FZS600 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Hyosung GT650 or the Yamaha FZS600?

The Yamaha FZS600 passes its MOT first time more often than the Hyosung GT650: 82.6% vs 71.9%, a 10.7-point lead. Adjusted for age, mileage and test class, the Yamaha FZS600 still comes out ahead: -15.1 points vs comparable bikes for the Hyosung GT650, -0.8 for the Yamaha FZS600. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Hyosung GT650 fail its MOT on most?

Lights & signalling: 9.5% of Hyosung GT650 MOT tests failed on it, then brakes (8.9%).

What does the Yamaha FZS600 fail its MOT on most?

Brakes: 4.5% of Yamaha FZS600 MOT tests failed on it, then lights & signalling (3.4%).

Which holds up better at high mileage, the Hyosung GT650 or the Yamaha FZS600?

At 20k-30k miles the Yamaha FZS600 passes first time more often: 76.5% for the Hyosung GT650 vs 81.4% for the Yamaha FZS600.

HYOSUNG GT650 71.9% pass · 739 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.