| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 786 |
| Drive chain excessively loose |6.2.1d| | 350 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 246 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 137 |
| Handlebar deformed |2.1.1b| | 127 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 126 |
| Drive chain worn to excess |6.2.1e| | 126 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 124 |
| Rear reflector on motorcycle missing |1.4.1| | 117 |
| Horn not working |1.7.3a| | 112 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 103 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 102 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 99 |
| Rear reflector on motorcycle obscured |1.4.1| | 98 |
| Front Brake excessively binding (1.2.1 (f)) | 90 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 81 |
| Registration plate issues | 79 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 75 |
| Rear reflector missing (4.8.2 (a) (ii)) | 69 |
| Drive chain excessively tight |6.2.1d| | 63 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 59 |
| Steering headbearing has excessive free play |2.2.2| | 58 |
| Headlamp insecure |1.2.3b| | 58 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 57 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 56 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 52 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 51 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 49 |
| Rear reflector on motorcycle obscured |1.4.2b| | 48 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 43 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 42 |
| Stop lamp remains on when the brakes are released | 41 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 41 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 36 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 36 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 35 |
| Rear Position lamp not working (4.2.1 (a)) | 34 |
| Horn not working (7.7 (a)) | 33 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 33 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 32 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 32 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 31 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 31 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 30 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 29 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 28 |
| All direction indicators not working (4.4.1 (a) (ii)) | 28 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 28 |
| Headlamp insecure (4.1.1 (c)) | 28 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 27 |
| Rear Drive chain excessively loose |6.2.1d| | 27 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 26 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 26 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 26 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 26 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 25 |
| Stop lamp remains on when the brake is released |1.3.1e| | 25 |
| Horn not working |7.7 |a| |ii|| | 25 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 25 |
| Stop lamp not working (4.3.1 (a) (ii)) | 25 |
| Horn not working (7.7 (a) (ii)) | 24 |
| Front Brake excessively binding |1.2.1 |f|| | 24 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 24 |
| Rear reflector missing |4.8.2 |a| |ii|| | 23 |
| Front Position lamp not working (4.2.1 (a)) | 23 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 23 |
| Rear Brake excessively binding (1.2.1 (f)) | 23 |
| Direction indicators not working |1.5.1c| | 23 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 23 |
| Registration plate lamp issues | 22 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 22 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 22 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 22 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 22 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 21 |
| Drive chain sprocket worn to excess |6.2.1e| | 21 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 20 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 20 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 20 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 20 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 19 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 18 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 17 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 17 |
| Rear Drive chain worn to excess |6.2.1e| | 17 |
| Steering operation fouling on the fuel tank or bodywork on full lock (2.1.4 (b)) | 17 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 16 |
| Headlamp aim not tested |1.6| | 16 |
| Rear Brake locking device missing |3.2.A1e| | 16 |
| Front Handlebar deformed |2.1.1b| | 16 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 16 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 16 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 16 |
| Nearside Rear Direction indicator not working |1.5.1c| | 15 |
| Rear Position lamp not working |4.2.1 |a|| | 15 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 15 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 15 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 14 |
| Dipswitch does not operate immediately when selected on dipped beam (4.1.3 (b)) | 14 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 14 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 14 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 14 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 14 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 14 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 14 |
| Throttle operating incorrectly |6.2.1f| | 14 |