MZ MASTIFF

660cc Petrol Class 2

#3318 of 5426 overall #14 of 20 MZs #2114 of 2787 other bikes

81.3%

first-time pass rate

11.1%

failed outright

12,562

median miles at test

888

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2006–2022

The MASTIFF's first-time pass rate has risen 12.7 points since 2006, 87.3% to 100.0%.

Pass rate by mileage

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

A low-mileage MASTIFF passes first time 80.5% of the time; by 30k that's 84.2%.

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 MASTIFF

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lighting and signalling	87	39.4	1.3×
brakes	35	15.8	0.7×
steering and suspension	21	9.5	0.7×
tyres and wheels	20	9	1.1×
lamps and reflectors	14	6.3	0.5×
reg plates and vin	14	6.3	2.2×
fuel and exhaust	10	4.5	1.3×
body and structure	8	3.6	1.9×
drive system	8	3.6	0.9×
driving controls	4	1.8	1.9×

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 MASTIFF beats 2 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 MASTIFF.

Pass rate by registration year

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

Best year to buy used: 2004 (89.4% pass). Weakest: 1999 (75.0%).

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.

MZ MASTIFF FAQ

answers computed from the data above · terms in the glossary

Is the MZ MASTIFF reliable?

The MZ MASTIFF is less reliable than average for its class: 81.3% of its 888 MOT tests (2005–2025) passed first time, against a class average of 84.9%. That ranks it #3318 of 5426 models.

What does a MASTIFF fail its MOT on most?

lighting and signalling — 39% of all defects recorded against failed MASTIFF tests.

What is the best year of MASTIFF to buy used?

By first-time pass rate, 2004-registered examples do best (89.4%) and 1999 worst (75.0%). Condition and history still trump the year.

How many miles will a MASTIFF last?

The median MASTIFF shows 12,562 miles at test, and examples around 30k miles still pass 84.2% of the time — mileage alone rarely kills one.