| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 261 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 72 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 63 |
| Drive chain excessively loose |6.2.1d| | 53 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 44 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 43 |
| Throttle operating incorrectly |6.2.1f| | 40 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 37 |
| Drive chain worn to excess |6.2.1e| | 34 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 33 |
| Registration plate issues | 32 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 32 |
| Horn not working |1.7.3a| | 32 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 31 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 29 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 27 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 24 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 24 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 23 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 22 |
| Drive chain excessively tight |6.2.1d| | 22 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 22 |
| Headlamp aim beam image kick up to the offside |1.6| | 22 |
| Headlamp insecure |1.2.3b| | 20 |
| Handlebar deformed |2.1.1b| | 20 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 20 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 19 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 18 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 18 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 17 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 17 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 15 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 12 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 12 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 12 |
| Steering headbearing has excessive free play |2.2.2| | 12 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 11 |
| Rear Roller brake test indicates a severely juddering brake |3.3.A1b| | 10 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 10 |
| Rear Drive chain excessively loose |6.2.1d| | 10 |
| Front Position lamp not working (4.2.1 (a)) | 10 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 9 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 9 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 9 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 9 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 9 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 8 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 8 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 8 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 8 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Rear reflector on motorcycle missing |1.4.1| | 8 |
| Rear Brake locking device missing |3.2.A1e| | 8 |
| Rear Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 8 |
| Front wheel bearings have excessive free play |2.3.5b| | 8 |
| Offside Front Direction indicator not working |1.5.1c| | 8 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 7 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 7 |
| Nearside Front Direction indicator not working |1.5.1c| | 7 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 7 |
| Exhaust noise is clearly in excess of that emitted by a similar motor bicycle fitted with a standard silencer in average condition |7.1.2| | 7 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 7 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 6 |
| Nearside Front Direction indicators not working |1.5.1c| | 6 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 6 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 6 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 6 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 6 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 6 |
| Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 6 |
| Offside Front Direction indicator damaged and function impaired |1.5.3a| | 6 |
| Stop lamp remains on when the brake is released |1.3.1e| | 6 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Rear Drive chain worn to excess |6.2.1e| | 5 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Offside Front Direction indicators not working |1.5.1c| | 5 |
| Front Brake lever has insufficient reserve travel (1.1.2 (a)) | 5 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 5 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Rear Wheel spindle locking device missing (5.2.1 (d)) | 5 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Horn not working (7.7 (a) (ii)) | 5 |
| Front Brake excessively binding (1.2.1 (f)) | 5 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 5 |
| Offside Rear Direction indicators not working |1.5.1c| | 5 |
| Offside Rear Direction indicator not working |1.5.1c| | 5 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 5 |
| Nearside Rear Direction indicator not working |1.5.1c| | 5 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 4 |
| Headlamp aim not tested |1.6| | 4 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 4 |
| Rear Position lamp not working (4.2.1 (a)) | 4 |
| Rear Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 4 |
| Rear Rear suspension movement is excessively stiff |2.4.A.3b| | 4 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 4 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 4 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 4 |
| Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 4 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 4 |
| Nearside Rear Direction indicators not working |1.5.1c| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 4 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 4 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 4 |