Suzuki AN650 vs Yamaha FZS600

The Suzuki AN650 passes its MOT first time more often than the Yamaha FZS600: 83.2% vs 82.6%, a 0.6-point lead.

MOT reliability, side by side

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

Metric	Suzuki AN650	Yamaha FZS600
First-time pass rate	83.2%	82.6%
Outright fail rate	13.0%	10.6%
Vs comparable bikes (age & mileage adjusted)	-1.5 pts	-0.8 pts
Engine size	638cc	599cc
Rank among all models	#2911 of 5428	#3052 of 5428
Median miles at test	17,081	21,612
MOT tests analysed	6,559	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	Suzuki AN650	Yamaha FZS600
Brakes	8.4%	4.5%
Tyres & wheels	3.5%	2.9%
Lights & signalling	2.5%	3.4%
Steering & suspension	2.7%	2.7%
Structure & body	0.2%	1.1%
Fuel & exhaust	0.1%	1.1%
Drive system	0%	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	Suzuki AN650	Yamaha FZS600
2018	81.6%	81.3%
2019	85.2%	83.0%
2020	81.7%	83.6%
2021	83.4%	82.8%
2022	85.0%	83.6%
2023	86.8%	84.2%
2024	85.0%	83.3%
2025	80.9%	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	Suzuki AN650	Yamaha FZS600
0k-10k miles	90.3%	89.6%
10k-20k miles	83.9%	85.5%
20k-30k miles	78.9%	81.4%
30k-40k miles	77.2%	78.7%
40k-50k miles	78.1%	76.8%
50k-60k miles	82.2%	74.7%

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

Suzuki AN650 vs Yamaha FZS600 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Suzuki AN650 or the Yamaha FZS600?

The Suzuki AN650 passes its MOT first time more often than the Yamaha FZS600: 83.2% vs 82.6%, a 0.6-point lead. Adjusted for age, mileage and test class the two are level (-1.5 vs -0.8 points against comparable bikes), so the raw gap is mostly down to how old and how used each fleet is. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Suzuki AN650 fail its MOT on most?

Brakes: 8.4% of Suzuki AN650 MOT tests failed on it, then tyres & wheels (3.5%).

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 Suzuki AN650 or the Yamaha FZS600?

At 50k-60k miles the Suzuki AN650 passes first time more often: 82.2% for the Suzuki AN650 vs 74.7% for the Yamaha FZS600.

SUZUKI AN650 83.2% pass · 6,559 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.