Sachs B805 vs Yamaha FZS600

The Sachs B805 passes its MOT first time more often than the Yamaha FZS600: 87.9% vs 82.6%, a 5.3-point lead.

MOT reliability, side by side

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

Metric	Sachs B805	Yamaha FZS600
First-time pass rate	87.9%	82.6%
Outright fail rate	4.5%	10.6%
Vs comparable bikes (age & mileage adjusted)	+1.2 pts	-0.8 pts
Engine size	805cc	599cc
Rank among all models	#1639 of 5428	#3052 of 5428
Median miles at test	5,437	21,612
MOT tests analysed	354	136,558
Most common failure	tyres and wheels	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.

Pass rate by test year

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

Test year	Sachs B805	Yamaha FZS600
2009	90.3%	81.2%
2010	80.0%	82.0%
2011	93.5%	81.1%

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	Sachs B805	Yamaha FZS600
0k-10k miles	88.4%	89.6%
10k-20k miles	92.5%	85.5%

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

SACHS B805 87.9% pass · 354 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.