| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 103 |
| Drive chain excessively loose |6.2.1d| | 67 |
| Drive chain worn to excess |6.2.1e| | 32 |
| Handlebar deformed |2.1.1b| | 31 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 29 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 26 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 20 |
| Rear reflector on motorcycle missing |1.4.1| | 19 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 19 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 17 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 17 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 17 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 17 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 15 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 14 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 14 |
| Horn not working |1.7.3a| | 13 |
| Drive chain excessively tight |6.2.1d| | 12 |
| Rear reflector missing (4.8.2 (a) (ii)) | 11 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 11 |
| Rear Drive chain excessively loose |6.2.1d| | 11 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 11 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 11 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 11 |
| Rear reflector on motorcycle obscured |1.4.1| | 11 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 10 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 10 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 10 |
| Front Brake excessively binding (1.2.1 (f)) | 10 |
| Steering headbearing has excessive free play |2.2.2| | 10 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 8 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 8 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 8 |
| Rear Brake locking device missing |3.2.A1e| | 7 |
| Registration plate issues | 7 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 7 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 7 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 7 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 6 |
| Rear reflector on motorcycle obscured |1.4.2b| | 6 |
| Headlamp insecure (4.1.1 (c)) | 6 |
| Horn not working (7.7 (a) (ii)) | 6 |
| Headlamp insecure |1.2.3b| | 6 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 5 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 5 |
| All direction indicators not working (4.4.1 (a) (ii)) | 5 |
| Front Position lamp not working (4.2.1 (a)) | 5 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Dipswitch does not operate immediately when selected on dipped beam (4.1.3 (b)) | 5 |
| Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 5 |
| Handlebar deformed to the extent that steering is affected (2.2.1 (c) (ii)) | 5 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 5 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 5 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 5 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 5 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 4 |
| Rear reflector missing |4.8.2 |a| |ii|| | 4 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Front Handlebar deformed |2.1.1b| | 4 |
| Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 4 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Rear Brake effort inadequate at a wheel (1.2.1 (a) (i)) | 4 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 4 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Offside Front Direction indicator not working |1.5.1c| | 4 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 4 |
| Rear Brake excessively binding (1.2.1 (f)) | 4 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Rear Drive chain worn to excess |6.2.1e| | 4 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 3 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Rear Brake grabbing severely (1.2.1 (c)) | 3 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 3 |
| Front Brake excessively binding |1.2.1 |f|| | 3 |
| Nearside Rear Footrest missing |6.2.1a| | 3 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 3 |
| Horn not working (7.7 (a)) | 3 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 3 |
| Rear Stop lamp damaged and function impaired |1.3.3a| | 3 |
| Offside Rear Direction indicator not working |1.5.1c| | 3 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 3 |
| Front Brake disc|s| excessively scored |3.2.A1l| | 3 |
| Headlamp aim not tested |1.6| | 3 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 3 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 3 |
| Nearside Rear Direction indicator missing (4.4.1 (a) (ii)) | 3 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Front Headlamp insecure (4.1.1 (c)) | 3 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 3 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 3 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Handlebar excessively deformed |2.2.1 |c| |i|| | 3 |
| Nearside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 3 |
| Horn not working |7.7 |a| |ii|| | 3 |
| Nearside Front Direction indicator damaged and function impaired |1.5.3a| | 3 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 3 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Rear Position lamp not working (4.2.1 (a)) | 3 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 3 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 3 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 3 |