BIKERELIABILITY Reg check
League table/ BSA/A65 THUNDERBOLT
Model report · 2005–2025

BSA A65 THUNDERBOLT

650cc Petrol Class 2
#825 of 5428 overall #41 of 62 BSAs #503 of 2788 other bikes
90.4%
first-time pass rate
3.9%
failed outright
10,200
median miles at test
229
MOT tests, 2005–2025

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.

Pass rate by mileage

how the A65 THUNDERBOLT's first-time pass rate falls with the odometer · class average 84.9%

A low-mileage A65 THUNDERBOLT passes first time 90.8% of the time; by 20k that's 83.8%.

81%90%98%0k: 90.8% pass (109 tests)10k: 96.0% pass (50 tests)20k: 83.8% pass (37 tests)0k10k20k

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 A65 THUNDERBOLT

failure defects by component group · advisories excluded
Component group Share of defects Defects % of defects
lighting and signalling
11 47.8
brakes
6 26.1
body and structure
2 8.7
tyres and wheels
1 4.3
fuel and exhaust
1 4.3
driving controls
1 4.3
steering and suspension
1 4.3

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the A65 THUNDERBOLT beats 4 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 A65 THUNDERBOLT.

Compare with any bike

rival not listed above? pick any model to see it head-to-head with the A65 Thunderbolt

More BSA models

other BSA bikes ranked by MOT pass rate
BSA A10 91.6% pass · 10.2k tests
BSA BANTAM 88.7% pass · 7,202 tests
BSA C15 89.2% pass · 5,895 tests
BSA A65 90.9% pass · 5,064 tests
BSA B31 92.0% pass · 3,429 tests
BSA B40 90.6% pass · 3,360 tests

See all BSA models →

Pass rate by registration year

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

Best year to buy used: 1970 (93.7% pass). Weakest: 1970 (93.7%).

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.

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