| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 117 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 50 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 47 |
| Registration plate issues | 34 |
| Horn not working |1.7.3a| | 23 |
| Drive chain excessively loose |6.2.1d| | 22 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 20 |
| Throttle operating incorrectly |6.2.1f| | 19 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 19 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 18 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 17 |
| Rear reflector on motorcycle missing |1.4.1| | 17 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Front wheel bearings have excessive free play |2.3.5b| | 14 |
| Drive chain worn to excess |6.2.1e| | 12 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 11 |
| Headlamp aim beam image kick up to the offside |1.6| | 11 |
| Front Brake excessively binding (1.2.1 (f)) | 10 |
| Drive chain excessively tight |6.2.1d| | 9 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 9 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 8 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 8 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 8 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 7 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 6 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 6 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 6 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 6 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 6 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Front Position lamp not working (4.2.1 (a)) | 6 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 6 |
| Position lamp switch insecure |1.1.4b| | 5 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Indicator switch insecure |1.5.4| | 5 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 5 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 5 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 5 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Nearside Front Direction indicator not working |1.5.1c| | 4 |
| Rear Brake excessively binding |1.2.1 |f|| | 4 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Headlamp insecure |1.2.3b| | 4 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 4 |
| Steering headbearing has excessive free play |2.2.2| | 4 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 4 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Horn not working (7.7 (a)) | 4 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Nearside Rear Direction indicator not working |1.5.1c| | 3 |
| Front Plate brake test indicates a binding brake |3.3.B1a| | 3 |
| Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Nearside Front Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Front Horn not working |1.7.3a| | 3 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Horn not working |7.7 |a| |ii|| | 3 |
| Rear Brake disc|s| cracked |3.2.A1g| | 3 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Headlamp incorrect colour |1.2.1| | 3 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Handlebar deformed |2.1.1b| | 3 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 3 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 3 |
| Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 3 |
| Front Brake lever has insufficient reserve travel (1.1.2 (a)) | 3 |
| Rear Brake excessively binding (1.2.1 (f)) | 3 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 3 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 3 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 3 |
| Front Position lamp not working |4.2.1 |a|| | 2 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 2 |
| Rear Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 2 |
| Headlamp switch faulty |1.2.4| | 2 |
| Nearside Front Brake disc|s| has excessive run out |3.2.A1m| | 2 |
| Front position lamp missing |1.1.1a| | 2 |
| Headlamp switch insecure |1.2.4| | 2 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 2 |
| Offside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Offside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 2 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 2 |
| Nearside Front Brake disc|s| is excessively distorted |3.2.A1m| | 2 |
| Front Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Offside Rear Direction indicator not working |1.5.1c| | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Nearside Rear Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 2 |
| Registration plate lamp issues | 2 |
| Nearside Front Brake disc|s| cracked |3.2.A1g| | 2 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 2 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Offside Front Throttle operating incorrectly |6.2.1f| | 2 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 2 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 2 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Offside Front Direction indicators not working |1.5.1c| | 2 |
| Offside Front Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Direction indicators not working |1.5.1c| | 2 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Front Brake disc significantly and obviously worn |1.1.14 |a| |i|| | 2 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Front Valve stem seriously damaged |5.2.3 |j|| | 2 |
| Throttle operating incorrectly |6.2.7 |a| |i|| | 2 |
| Fuel system component leaking |6.1.3 |b| |i|| | 2 |
| Nearside Rear Direction indicators not working |1.5.1c| | 2 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 2 |
| Rear Direction indicator flashing more than 120 times per minute |1.5.1c| | 2 |
| Front Brake lever has insufficient reserve travel |1.1.2 |a|| | 2 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 2 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 2 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Rear Brake disc fractured (1.1.14 (a) (ii)) | 2 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 2 |
| Horn not working (7.7 (a) (ii)) | 2 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 2 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 2 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Stop lamp remains on when the brakes are released | 2 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |