BIKERELIABILITY Reg check
League table/ KAWASAKI/ZX636
Model report · 2005–2025

KAWASAKI ZX636

636cc Petrol Class 2
#3977 of 5428 overall #470 of 592 KAWASAKIs #2520 of 2788 other bikes
77.5%
first-time pass rate
12.5%
failed outright
13,196
median miles at test
1,596
MOT tests, 2005–2025
-8.2pp
vs expected · age & mileage

The pass rate is the MOT first-time pass: a roadworthiness check of the items an MOT covers (brakes, lights, tyres, steering, structure, emissions), not a full mechanical inspection of engine or gearbox internals. It is a reliability signal, not a complete measure of mechanical reliability. What this measures.

“vs expected” adjusts for age, mileage and test class, so a cherished classic and a hard-used commuter are compared fairly. How this works.

Pass rate over time

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

The ZX636's first-time pass rate has fallen 6.6 points since 2007, 85.7% to 79.1%.

59%75%91%2007: 85.7% pass (35 tests)2008: 78.7% pass (94 tests)2009: 80.1% pass (151 tests)2010: 82.8% pass (128 tests)2011: 77.0% pass (126 tests)2012: 69.3% pass (114 tests)2013: 64.3% pass (115 tests)2014: 82.6% pass (92 tests)2015: 72.4% pass (98 tests)2016: 84.8% pass (92 tests)2017: 72.5% pass (80 tests)2018: 80.6% pass (67 tests)2019: 73.4% pass (64 tests)2020: 76.6% pass (47 tests)2021: 82.8% pass (58 tests)2022: 74.6% pass (67 tests)2023: 84.6% pass (52 tests)2024: 77.8% pass (45 tests)2025: 79.1% pass (43 tests)20072025

Pass rate by mileage

how the ZX636's first-time pass rate falls with the odometer · class average 84.9%

A low-mileage ZX636 passes first time 83.2% of the time; by 40k that's 75.0%.

65%76%86%0k: 83.2% pass (552 tests)10k: 76.1% pass (611 tests)20k: 74.6% pass (295 tests)30k: 67.9% pass (81 tests)40k: 75.0% pass (32 tests)0k20k40k

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 ZX636

failure defects by component group · advisories excluded
Component group Share of defects Defects % of defects vs all bikes
lighting and signalling
127 31.4 1.2×
brakes
67 16.5 0.6×
steering and suspension
49 12.1 0.8×
tyres and wheels
49 12.1 1.4×
lamps and reflectors
45 11.1 1.2×
reg plates and vin
26 6.4 2.1×
drive system
12 3 0.8×
body and structure
11 2.7 1.2×
fuel and exhaust
10 2.5 0.7×
tyres
9 2.2 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 ZX636 beats 1 of its 4 closest rivals (KAWASAKI ZX-6R, SUZUKI GSF600, YAMAHA FZS600).

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

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 ZX636.

Compare with any bike

rival not listed above? pick any model to see it head-to-head with the ZX636

More KAWASAKI models

other KAWASAKI bikes ranked by MOT pass rate
KAWASAKI ZX-6R 78.1% pass · 174k tests
KAWASAKI ZX-9R 80.7% pass · 89.0k tests
KAWASAKI ZZR600 79.0% pass · 53.7k tests
KAWASAKI ER5 77.4% pass · 53.1k tests
KAWASAKI ZZ-R1100 80.8% pass · 39.7k tests
KAWASAKI ZX 89.4% pass · 34.6k tests

See all KAWASAKI models →

Pass rate by registration year

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

Best year to buy used: 2003 (79.3% pass). Weakest: 2004 (76.0%).

75%78%80%2002: 76.4% pass (106 tests)2003: 79.3% pass (116 tests)2004: 76.0% pass (129 tests)2005: 76.0% pass (628 tests)2006: 78.9% pass (574 tests)200220042006

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.

KAWASAKI ZX636 FAQ

answers computed from the data above · terms in the glossary

Is the KAWASAKI ZX636 reliable?

The KAWASAKI ZX636 is less reliable than average for its class: 77.5% of its 1,596 MOT tests (2005–2025) passed first time, against a class average of 84.9%. That ranks it #3977 of 5428 models.

What does a ZX636 fail its MOT on most?

lighting and signalling — 31% of all defects recorded against failed ZX636 tests.

What is the best year of ZX636 to buy used?

By first-time pass rate, 2003-registered examples do best (79.3%) and 2005 worst (76.0%). Condition and history still trump the year.

How many miles will a ZX636 last?

The median ZX636 shows 13,196 miles at test, and examples around 40k miles still pass 75.0% of the time — mileage alone rarely kills one.

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