KTM 690 LC4 Supermoto vs Yamaha FZS600

The Yamaha FZS600 passes its MOT first time more often than the KTM 690 LC4 Supermoto: 82.6% vs 82.4%, a 0.2-point lead.

MOT reliability, side by side

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

Metric	KTM 690 LC4 Supermoto	Yamaha FZS600
First-time pass rate	82.4%	82.6%
Outright fail rate	8.2%	10.6%
Vs comparable bikes (age & mileage adjusted)	-4.8 pts	-0.8 pts
Engine size	654cc	599cc
Rank among all models	#3108 of 5428	#3052 of 5428
Median miles at test	8,559	21,612
MOT tests analysed	1,672	136,558
Most common failure	lamps and reflectors	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	KTM 690 LC4 Supermoto	Yamaha FZS600
Lights & signalling	5.3%	3.4%
Brakes	1.1%	4.5%
Tyres & wheels	1.7%	2.9%
Steering & suspension	0.9%	2.7%
Structure & body	1.0%	1.1%
Fuel & exhaust	0.4%	1.1%
Drive system	0.2%	0.9%

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	KTM 690 LC4 Supermoto	Yamaha FZS600
2018	86.9%	81.3%
2019	78.3%	83.0%
2020	78.1%	83.6%
2021	80.0%	82.8%
2022	84.0%	83.6%
2023	81.7%	84.2%
2024	82.7%	83.3%
2025	81.3%	84.0%

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	KTM 690 LC4 Supermoto	Yamaha FZS600
0k-10k miles	83.1%	89.6%
10k-20k miles	81.9%	85.5%
20k-30k miles	81.3%	81.4%

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

KTM 690 LC4 Supermoto vs Yamaha FZS600 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the KTM 690 LC4 Supermoto or the Yamaha FZS600?

The Yamaha FZS600 passes its MOT first time more often than the KTM 690 LC4 Supermoto: 82.6% vs 82.4%, a 0.2-point lead. Adjusted for age, mileage and test class, the Yamaha FZS600 still comes out ahead: -4.8 points vs comparable bikes for the KTM 690 LC4 Supermoto, -0.8 for the Yamaha FZS600. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the KTM 690 LC4 Supermoto fail its MOT on most?

Lights & signalling: 5.3% of KTM 690 LC4 Supermoto MOT tests failed on it, then tyres & wheels (1.7%).

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 KTM 690 LC4 Supermoto or the Yamaha FZS600?

They are level: at 20k-30k miles the KTM 690 LC4 Supermoto passes 81.3% first time and the Yamaha FZS600 81.4%.

KTM 690 LC4 SUPERMOTO 82.4% pass · 1,672 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.