MOT History from tests of petrol BSA B31s year 1949

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:91.44%

(The average a petrol BSA B31 year 1949 passes without issue)

Based on:222 MOT Tests

Most common failures	No# failures
Rear wheel bearings have excessive free play \|2.4.A.2c\|	3
Nearside Handlebar handgrip not secure to handlebars. \|2.1.1c\|	2
An item not tested \|Manual\|	2
Front wheel bearings have excessive free play \|2.3.5b\|	2
Rear reflector on motorcycle missing \|1.4.1\|	1
Offside Front mudguard insecure \|2.3.7\|	1
Registration plate issues	1
Front Lower Brake locking device missing \|3.2.A1e\|	1
Front Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort \|3.3.A1c\|	1
Offside Handlebar handgrip not secure to handlebars. \|2.1.1c\|	1
Rear Stop lamp remains on when the brake is released \|1.3.1e\|	1
Front Brake locking device insecure \|3.2.A1e\|	1
Centre Rear Rear wheel spindle loose \|2.4.A.2b\|	1
Front Brake lining\|s\| contaminated by oil or grease \|3.2.A1k\|	1
Stop lamp missing \|1.3.3a\|	1
Steering damper ineffective \|2.1.2d\|	1
Headlamp insecure \|1.2.3b\|	1
Front position lamp does not illuminate immediately when switched on \|1.1.3a\|	1
Rear position lamp does not illuminate immediately when it is switched on \|1.1.3a\|	1
Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	1
Horn not working \|1.7.3a\|	1
Horn not loud enough to be heard by another road user \|1.7.3a\|	1
Rear Wheel damaged significantly reducing the original strength \|4.2.1a\|	1
Wheel spoke excessively loose \|4.2.1b\|	1
Brake performance not tested \|3.3\|	1
Roller brake test No brake control achieves an efficiency of 30%. \|3.3.A2a\|	1
Roller brake test Neither brake control achieves an efficiency of 25% \|3.3.A2b\|	1
Steering headbearing has excessive free play \|2.2.2\|	1
Wheel alignment incorrect which adversely affects the handling \|2.5.1\|	1
Front Front suspension fouling which affects the movement of the front suspension. \|2.3.6a\|	1
Front Throttle operating incorrectly \|6.2.1f\|	1
Riders seat insecure \|6.2.1a\|	1
Dipswitch does not deflect the main beam/s, making them into dipped beam/s \|1.2.2b\|ii\|\|	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 wheel bearings have excessive free play \|2.4.A.2c\|	3
Nearside Handlebar handgrip not secure to handlebars. \|2.1.1c\|	2
An item not tested \|Manual\|	2
Front wheel bearings have excessive free play \|2.3.5b\|	2
Rear reflector on motorcycle missing \|1.4.1\|	1
Offside Front mudguard insecure \|2.3.7\|	1
Registration plate issues	1
Front Lower Brake locking device missing \|3.2.A1e\|	1
Front Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort \|3.3.A1c\|	1
Offside Handlebar handgrip not secure to handlebars. \|2.1.1c\|	1
Rear Stop lamp remains on when the brake is released \|1.3.1e\|	1
Front Brake locking device insecure \|3.2.A1e\|	1
Centre Rear Rear wheel spindle loose \|2.4.A.2b\|	1
Front Brake lining\|s\| contaminated by oil or grease \|3.2.A1k\|	1
Stop lamp missing \|1.3.3a\|	1
Steering damper ineffective \|2.1.2d\|	1
Headlamp insecure \|1.2.3b\|	1
Front position lamp does not illuminate immediately when switched on \|1.1.3a\|	1
Rear position lamp does not illuminate immediately when it is switched on \|1.1.3a\|	1
Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	1
Horn not working \|1.7.3a\|	1
Horn not loud enough to be heard by another road user \|1.7.3a\|	1
Rear Wheel damaged significantly reducing the original strength \|4.2.1a\|	1
Wheel spoke excessively loose \|4.2.1b\|	1
Brake performance not tested \|3.3\|	1
Roller brake test No brake control achieves an efficiency of 30%. \|3.3.A2a\|	1
Roller brake test Neither brake control achieves an efficiency of 25% \|3.3.A2b\|	1
Steering headbearing has excessive free play \|2.2.2\|	1
Wheel alignment incorrect which adversely affects the handling \|2.5.1\|	1
Front Front suspension fouling which affects the movement of the front suspension. \|2.3.6a\|	1
Front Throttle operating incorrectly \|6.2.1f\|	1
Riders seat insecure \|6.2.1a\|	1
Dipswitch does not deflect the main beam/s, making them into dipped beam/s \|1.2.2b\|ii\|\|	1

MOT History from tests of petrol BSA B31s year 1949

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