| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 79 |
| Drive chain excessively loose |6.2.1d| | 48 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 28 |
| Drive chain worn to excess |6.2.1e| | 26 |
| Handlebar deformed |2.1.1b| | 22 |
| Rear reflector on motorcycle missing |1.4.1| | 20 |
| Rear reflector on motorcycle obscured |1.4.1| | 18 |
| Horn not working |1.7.3a| | 16 |
| Front Brake excessively binding (1.2.1 (f)) | 16 |
| Rear reflector missing (4.8.2 (a) (ii)) | 15 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 14 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 13 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 13 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 13 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 12 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 11 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 11 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 11 |
| Registration plate issues | 10 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 10 |
| Rear reflector on motorcycle obscured |1.4.2b| | 10 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Headlamp insecure |1.2.3b| | 9 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 8 |
| Steering headbearing has excessive free play |2.2.2| | 8 |
| Drive chain excessively tight |6.2.1d| | 8 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 8 |
| Rear Brake excessively binding (1.2.1 (f)) | 7 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 7 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 6 |
| Headlamp insecure (4.1.1 (c)) | 6 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 6 |
| Horn not working (7.7 (a)) | 6 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 6 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 6 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 6 |
| Rear Position lamp not working (4.2.1 (a)) | 5 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 5 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 5 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 5 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 5 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 5 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 4 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 4 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 4 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Horn not working (7.7 (a) (ii)) | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 4 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 3 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 3 |
| Front Position lamp not working (4.2.1 (a)) | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 3 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 3 |
| Nearside Rear Drive chain excessively tight |6.2.1d| | 3 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Rear Drive chain excessively loose |6.2.1d| | 3 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 3 |
| Rear Brake rod insecure (1.1.15 (c)) | 3 |
| Motorcycle structure joining/attachment plate or fastening insecure (6.1.1 (b) (i)) | 3 |
| Rear Brake effort inadequate at a wheel (1.2.1 (a) (i)) | 3 |
| Offside Front Direction indicators not working |1.5.1c| | 3 |
| All direction indicators not working (4.4.1 (a) (ii)) | 3 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 3 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 3 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 3 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 3 |
| Offside Rear Footrest missing |6.2.1a| | 3 |
| Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Central Rear Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 2 |
| Nearside Front Direction indicator damaged and function impaired |1.5.3a| | 2 |
| Stop lamp remains on when the brakes are released | 2 |
| Front Brake fluid significantly below minimum mark (1.1.10 (d) (ii)) | 2 |
| Handlebar fouling on the fuel tank or bodywork on full lock (2.1.4 (b)) | 2 |
| Rear Drive chain worn to excess |6.2.1e| | 2 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 2 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| Direction indicators not working |1.5.1c| | 2 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Steering operation fouling on the fuel tank or bodywork on full lock (2.1.4 (b)) | 2 |
| Offside Front Direction indicator not working |1.5.1c| | 2 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 2 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Nearside Front Direction indicator insecure |1.5.3b| | 2 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 2 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 2 |
| Rear Brake lining(s) less than 1.0 mm thick (1.1.13 (a)) | 2 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 2 |
| Rear Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 2 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 2 |
| Rear Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 2 |
| Wheel alignment incorrect which adversely affects the handling |2.4 |a|| | 2 |
| Front Wheel bearing so rough it is likely to overheat or break up (5.1.3 (b) (ii)) | 2 |
| Rear Brake locking device missing |3.2.A1e| | 2 |
| Front Brake master cylinder fluid level dangerously low |3.2.B1d| | 2 |
| Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Central Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Central Front Brake excessively binding (1.2.1 (f)) | 2 |
| Handlebar excessively deformed (2.2.1 (c) (i)) | 2 |
| Nearside Rear Footrest missing |6.2.1a| | 2 |
| Headlamp aim not tested (4.1.2 (b)) | 2 |
| Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 2 |
| Rear Brake pedal is positioned so that the brake cannot be readily applied (1.1.2 (d)) | 2 |
| Front Plate brake test indicates a binding brake |3.3.B1a| | 2 |
| Rear Brake pedal has insufficient reserve travel |1.1.2 |a|| | 2 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 2 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| All position lamps not working (4.2.1 (a)) | 2 |
| Headlamp aim unable to be tested (4.1.2 (b)) | 2 |
| Offside Rear Direction indicators not working |1.5.1c| | 2 |