YAMAHA XT 660 X

659cc Petrol Class 2

#2768 of 5426 overall #156 of 409 YAMAHAs #1747 of 2787 other bikes

83.9%

first-time pass rate

8.5%

failed outright

11,041

median miles at test

12.4k

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2007–2025

The XT 660 X's first-time pass rate has fallen 2.5 points since 2007, 86.9% to 84.4%.

Pass rate by mileage

how the XT 660 X's first-time pass rate falls with the odometer · class average 84.9%

A low-mileage XT 660 X passes first time 87.8% of the time; by 50k that's 81.8%.

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 XT 660 X

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lighting and signalling	390	20	0.6×
brakes	318	16.3	0.5×
tyres and wheels	261	13.4	1.0×
lamps and reflectors	249	12.7	0.8×
steering and suspension	210	10.8	0.5×
drive system	147	7.5	1.1×
suspension	113	5.8	1.1×
reg plates and vin	100	5.1	1.1×
structure and attachments	88	4.5	0.8×
tyres	77	3.9	0.8×

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 XT 660 X 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 XT 660 X.

Pass rate by registration year

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

Best year to buy used: 2013 (92.2% pass). Weakest: 2004 (81.1%).

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 XT 660 X FAQ

answers computed from the data above · terms in the glossary

Is the YAMAHA XT 660 X reliable?

The YAMAHA XT 660 X is about average for its class: 83.9% of its 12,377 MOT tests (2005–2025) passed first time, against a class average of 84.9%. That ranks it #2768 of 5426 models.

What does a XT 660 X fail its MOT on most?

lighting and signalling — 20% of all defects recorded against failed XT 660 X tests.

What is the best year of XT 660 X to buy used?

By first-time pass rate, 2013-registered examples do best (92.2%) and 2004 worst (81.1%). Condition and history still trump the year.

How many miles will a XT 660 X last?

The median XT 660 X shows 11,041 miles at test, and examples around 50k miles still pass 81.8% of the time — mileage alone rarely kills one.