| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 162 |
| Drive chain excessively loose |6.2.1d| | 76 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 58 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 44 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 42 |
| Horn not working |1.7.3a| | 40 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 32 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 30 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 29 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 23 |
| Drive chain worn to excess |6.2.1e| | 22 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 21 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 19 |
| Steering headbearing has excessive free play |2.2.2| | 18 |
| Registration plate issues | 16 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 15 |
| Throttle operating incorrectly |6.2.1f| | 14 |
| Horn not working (7.7 (a) (ii)) | 14 |
| Registration plate lamp issues | 13 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 13 |
| Handlebar deformed |2.1.1b| | 13 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 13 |
| Drive chain excessively tight |6.2.1d| | 11 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 11 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 9 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 9 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 9 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 9 |
| Front wheel bearings have excessive free play |2.3.5b| | 9 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 7 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 6 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 6 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 6 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 6 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 6 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 5 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 5 |
| Horn not working |7.7 |a| |ii|| | 5 |
| Rear reflector on motorcycle missing |1.4.1| | 5 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Rear Brake disc|s| has excessive run out |3.2.A1m| | 4 |
| Riders seat insecure |6.2.1a| | 4 |
| Rear Brake excessively binding (1.2.1 (f)) | 4 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| 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| | 4 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Front Position lamp not working (4.2.1 (a)) | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 4 |
| Offside Rear Footrest missing |6.2.1a| | 4 |
| Direction indicators not working |1.5.1c| | 4 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 4 |
| Front Brake excessively binding (1.2.1 (f)) | 4 |
| Front Horn not working |1.7.3a| | 3 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 3 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 3 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 3 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 3 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 3 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 3 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 3 |
| Front Brake disc|s| excessively scored |3.2.A1l| | 3 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Offside Direction indicator flashing more than 120 times per minute |1.5.1c| | 3 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 3 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 3 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 3 |