MOT History from tests of petrol BSA B31s year 1957

Review the list of common BSA B31 failures below or to perform a specific mot history check on your BSA then use our popular KnowYourCar service

mot history

Pass percent:90.14%

(The average a petrol BSA B31 year 1957 passes without issue)

Based on:213 MOT Tests

Most common failures	No# failures
Rear position lamp does not illuminate immediately when it is switched on \|1.1.3a\|	3
Headlamp aim out of alignment	3
Nearside Handlebar handgrip not secure to handlebars. \|2.1.1c\|	2
Drive chain excessively tight \|6.2.1d\|	2
Centre Rear Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	2
Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	2
Headlamp at least one does not illuminate on dipped beam \|1.2.2a\|i\|\|	2
Headlamp at least one does not illuminate on main beam \|1.2.2a\|ii\|\|	2
Headlamp aim not tested \|1.6\|	2
Horn not working \|1.7.3a\|	2
Rear Roller brake test indicates a severely grabbing brake \|3.3.A1b\|	2
Throttle has a significant change in engine speed whilst moving the steering from lock to lock \|2.1.4\|	1
Nearside Steering lock stop missing \|2.1.3\|	1
Offside Steering lock stop missing \|2.1.3\|	1
Rear wheel bearings have excessive free play \|2.4.A.2c\|	1
Nearside Steering lock stop loose \|2.1.3\|	1
Rear Wheel alignment incorrect which adversely affects the handling \|2.5.1\|	1
Rear Locking devices not correctly fitted which may make the motor bicycle dangerous to ride \|6.2.1h\|	1
Rear Drive chain excessively tight \|6.2.1d\|	1
Front wheel bearings are excessively rough (2.3.5b)	1
Front Roller brake test indicates excessive fluctuation of brake effort (3.3.A1d)	1
Outer Rear Floor brake test indicates a binding brake \|3.3.C2c\|	1
Front Roller brake test indicates a sticking brake (3.3.A1a)	1
Front Brake locking device insecure \|3.2.A1e\|	1
Rear Brake locking device insecure \|3.2.A1e\|	1
Front wheel spindle loose \|2.3.5a\|	1
Rear Front wheel spindle loose \|2.3.5a\|	1
Offside Front Direction indicator not working \|1.5.1c\|	1
Fuel cap does not fasten securely by a positive means \|7.2.2b\|	1
Registration plate issues	1
Drive chain excessively loose \|6.2.1d\|	1
Offside Rear Footrest missing \|6.2.1a\|	1
Front Brake lever cannot be released smoothly \|3.1.3d\|	1
Brake reaction bracket insecure \|3.2.A1j\|	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.

Got suggestions? We’re improving this section all the time. If you have any suggestions, please let us know.

Most common failures	No# failures
Rear position lamp does not illuminate immediately when it is switched on \|1.1.3a\|	3
Headlamp aim out of alignment	3
Nearside Handlebar handgrip not secure to handlebars. \|2.1.1c\|	2
Drive chain excessively tight \|6.2.1d\|	2
Centre Rear Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	2
Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	2
Headlamp at least one does not illuminate on dipped beam \|1.2.2a\|i\|\|	2
Headlamp at least one does not illuminate on main beam \|1.2.2a\|ii\|\|	2
Headlamp aim not tested \|1.6\|	2
Horn not working \|1.7.3a\|	2
Rear Roller brake test indicates a severely grabbing brake \|3.3.A1b\|	2
Throttle has a significant change in engine speed whilst moving the steering from lock to lock \|2.1.4\|	1
Nearside Steering lock stop missing \|2.1.3\|	1
Offside Steering lock stop missing \|2.1.3\|	1
Rear wheel bearings have excessive free play \|2.4.A.2c\|	1
Nearside Steering lock stop loose \|2.1.3\|	1
Rear Wheel alignment incorrect which adversely affects the handling \|2.5.1\|	1
Rear Locking devices not correctly fitted which may make the motor bicycle dangerous to ride \|6.2.1h\|	1
Rear Drive chain excessively tight \|6.2.1d\|	1
Front wheel bearings are excessively rough (2.3.5b)	1
Front Roller brake test indicates excessive fluctuation of brake effort (3.3.A1d)	1
Outer Rear Floor brake test indicates a binding brake \|3.3.C2c\|	1
Front Roller brake test indicates a sticking brake (3.3.A1a)	1
Front Brake locking device insecure \|3.2.A1e\|	1
Rear Brake locking device insecure \|3.2.A1e\|	1
Front wheel spindle loose \|2.3.5a\|	1
Rear Front wheel spindle loose \|2.3.5a\|	1
Offside Front Direction indicator not working \|1.5.1c\|	1
Fuel cap does not fasten securely by a positive means \|7.2.2b\|	1
Registration plate issues	1
Drive chain excessively loose \|6.2.1d\|	1
Offside Rear Footrest missing \|6.2.1a\|	1
Front Brake lever cannot be released smoothly \|3.1.3d\|	1
Brake reaction bracket insecure \|3.2.A1j\|	1

MOT History from tests of petrol BSA B31s year 1957

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