JAWA 350/639

344cc Petrol Class 2

#2443 of 5426 overall #3 of 7 JAWAs #1529 of 2787 other bikes

85.2%

first-time pass rate

7.8%

failed outright

11,178

median miles at test

769

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2006–2021

The 350/639's first-time pass rate has risen 12.6 points since 2006, 81.5% to 94.1%.

Pass rate by mileage

how the 350/639's first-time pass rate falls with the odometer · class average 84.9%

A low-mileage 350/639 passes first time 86.4% of the time; by 30k that's 84.4%.

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 350/639

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lighting and signalling	46	32.9	0.8×
steering and suspension	30	21.4	0.9×
brakes	22	15.7	0.5×
lamps and reflectors	11	7.9	0.6×
tyres and wheels	9	6.4	0.6×
sidecar	7	5	—
body and structure	6	4.3	1.4×
fuel and exhaust	3	2.1	0.5×
tyres	3	2.1	0.4×
driving controls	3	2.1	1.7×

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 350/639 beats 2 of its 4 closest rivals (SUZUKI AN400, SUZUKI DR-Z400S, YAMAHA RD350).

SUZUKI AN400 86.2% pass · 27.1k tests SUZUKI DR-Z400S 80.4% pass · 26.8k tests YAMAHA RD350 86.3% pass · 19.6k tests KAWASAKI ZXR400 73.1% pass · 14.2k 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 350/639.

Pass rate by registration year

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

Best year to buy used: 1993 (89.4% pass). Weakest: 1991 (82.4%).

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.

JAWA 350/639 FAQ

answers computed from the data above · terms in the glossary

Is the JAWA 350/639 reliable?

The JAWA 350/639 is about average for its class: 85.2% of its 769 MOT tests (2005–2025) passed first time, against a class average of 84.9%. That ranks it #2443 of 5426 models.

What does a 350/639 fail its MOT on most?

lighting and signalling — 33% of all defects recorded against failed 350/639 tests.

What is the best year of 350/639 to buy used?

By first-time pass rate, 1993-registered examples do best (89.4%) and 1991 worst (82.4%). Condition and history still trump the year.

How many miles will a 350/639 last?

The median 350/639 shows 11,178 miles at test, and examples around 30k miles still pass 84.4% of the time — mileage alone rarely kills one.