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MOT History from tests of petrol BSA THUNDERBOLTs year 1971

Review the list of common BSA THUNDERBOLT failures below or to perform a specific mot history check on your BSA then use our popular KnowYourCar service

mot history
Pass percent:92.96%
(The average a petrol BSA THUNDERBOLT year 1971 passes without issue)
Based on:270 MOT Tests
Most common failuresNo# failures
Headlamp aim out of alignment3
Rear position lamp does not illuminate immediately when it is switched on |1.1.3a|2
Stop lamp does not illuminate immediately a brake applies |1.3.1a|2
Horn not working |7.7 |a| |ii||1
Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b|1
Front Front suspension assembly component loose |2.3.1|1
Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a|1
Rear Brake locking device insecure |3.2.A1e|1
Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a|1
Wheel alignment incorrect which adversely affects the steering handlebars out of alignment |2.5.1|1
Offside Front suspension assembly component cracked |2.3.1|1
Nearside Front suspension assembly component cracked |2.3.1|1
Registration plate issues1
Stop lamp flickers when tapped lightly by hand |1.3.1d|1
Front Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c|1
Front shock absorber seal failed and leaking oil |2.3.3|1
Drive chain worn to excess |6.2.1e|1
Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b|1
Headlamp at least one does not illuminate on main beam |1.2.2a|ii||1
Stop lamp remains on when the brake is released |1.3.1e|1
Rear shock absorber insecurely mounted |2.4.A.3b|1
Nearside Exhaust mounting does not fully support the exhaust system |7.1.1.c|1
Direction indicators flashing more than 120 times per minute |1.5.1c|1
Horn not working |1.7.3a|1

We get to these numbers by trawling through over 1 billion MOT test results since 2004 and crunched the numbers. We remove anything to do with Tyres, as they are model independent and group together common non-model specific issues. We are trying to get to a picture of what models have what issues.

Please note: We take the data from the DVSA. This data is raw and can contain typos and spelling mistakes that garages may have entered while recording a MOT result. Specifically miss-match on names of models and makes. We are constantly cleaning the data so bear with the odd issue.

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