YAMAHA XT660Z

660cc Petrol Class 2

#3006 of 5426 overall #176 of 409 YAMAHAs #1903 of 2787 other bikes

82.8%

first-time pass rate

7.9%

failed outright

16,267

median miles at test

657

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2012–2025

The XT660Z's first-time pass rate has fallen 11.1 points since 2012, 91.7% to 80.6%.

Pass rate by mileage

how the XT660Z's first-time pass rate falls with the odometer · class average 84.9%

A low-mileage XT660Z passes first time 83.3% of the time; by 40k that's 72.1%.

First-time pass rate by odometer reading at test, 10,000-mile bands for this model. Mileage is the strongest reliability signal. See the full curve.

What fails on a XT660Z

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
brakes	19	18.4	0.5×
lamps and reflectors	19	18.4	1.6×
lighting and signalling	15	14.6	0.3×
steering and suspension	12	11.7	0.5×
drive system	10	9.7	1.9×
structure and attachments	8	7.8	1.3×
suspension	6	5.8	1.2×
tyres	6	5.8	1.3×
steering	4	3.9	1.1×
tyres and wheels	4	3.9	0.3×

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects. "vs all bikes" is how often this model's tests record a defect in the group, as a multiple of the all-bike rate.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the XT660Z beats 3 of its 4 closest rivals (KAWASAKI ZX-6R, SUZUKI GSF600, YAMAHA FZS600).

KAWASAKI ZX-6R 78.1% pass · 174k tests SUZUKI GSF600 77.3% pass · 143k tests YAMAHA FZS600 82.6% pass · 137k tests HONDA VFR800 FI 86.7% pass · 89.4k tests

Rivals share this bike's type and sit within ±30% of its engine capacity, ≥ 5,000 tests. Card colour = better/worse first-time pass rate than the XT660Z.

Pass rate by registration year

how each model-year cohort fares · registration year from first use date

Best year to buy used: 2008 (86.0% pass). Weakest: 2009 (82.9%).

First-time pass rate by the year each bike was first registered (cohorts with ≥ 50 tests). Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.

YAMAHA XT660Z FAQ

answers computed from the data above · terms in the glossary

Is the YAMAHA XT660Z reliable?

The YAMAHA XT660Z is less reliable than average for its class: 82.8% of its 657 MOT tests (2005–2025) passed first time, against a class average of 84.9%. That ranks it #3006 of 5426 models.

What does a XT660Z fail its MOT on most?

brakes — 18% of all defects recorded against failed XT660Z tests.

What is the best year of XT660Z to buy used?

By first-time pass rate, 2008-registered examples do best (86.0%) and 2009 worst (82.9%). Condition and history still trump the year.

How many miles will a XT660Z last?

The median XT660Z shows 16,267 miles at test, and examples around 40k miles still pass 72.1% of the time — mileage alone rarely kills one.