SUZUKI GZ 125 K8

124cc Petrol Class 1

#4851 of 5426 overall #657 of 680 SUZUKIs #441 of 734 commuter bikes

68.0%

first-time pass rate

21.5%

failed outright

8,488

median miles at test

1,028

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2011–2023

The GZ 125 K8's first-time pass rate has fallen 12.0 points since 2011, 76.3% to 64.3%.

Pass rate by mileage

how the GZ 125 K8's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage GZ 125 K8 passes first time 72.9% of the time; by 20k that's 53.6%.

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 GZ 125 K8

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
brakes	136	24.4	2.3×
lighting and signalling	99	17.7	1.9×
steering and suspension	76	13.6	1.9×
drive system	70	12.5	6.3×
lamps and reflectors	44	7.9	2.0×
tyres and wheels	41	7.3	1.9×
structure and attachments	36	6.5	3.3×
suspension	24	4.3	2.4×
tyres	22	3.9	2.7×
steering	10	1.8	2.1×

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 GZ 125 K8 beats 0 of its 4 closest rivals (YAMAHA YBR 125, HONDA CG125, HONDA CBF125).

YAMAHA YBR 125 71.0% pass · 125k tests HONDA CG125 72.2% pass · 89.3k tests HONDA CBF125 73.3% pass · 84.4k tests GILERA RUNNER 70.8% pass · 69.9k 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 GZ 125 K8.

Pass rate by registration year

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

Best year to buy used: 2007 (73.9% pass). Weakest: 2009 (62.8%).

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.

SUZUKI GZ 125 K8 FAQ

answers computed from the data above · terms in the glossary

Is the SUZUKI GZ 125 K8 reliable?

The SUZUKI GZ 125 K8 is less reliable than average for its class: 68.0% of its 1,028 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4851 of 5426 models.

What does a GZ 125 K8 fail its MOT on most?

brakes — 24% of all defects recorded against failed GZ 125 K8 tests.

What is the best year of GZ 125 K8 to buy used?

By first-time pass rate, 2007-registered examples do best (73.9%) and 2009 worst (62.8%). Condition and history still trump the year.

How many miles will a GZ 125 K8 last?

The median GZ 125 K8 shows 8,488 miles at test, and examples around 20k miles still pass 53.6% of the time — mileage alone rarely kills one.