| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 224 |
| Drive chain excessively loose |6.2.1d| | 86 |
| Registration plate issues | 73 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 60 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 51 |
| Rear reflector on motorcycle missing |1.4.1| | 47 |
| Registration plate lamp issues | 37 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 37 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 33 |
| Drive chain worn to excess |6.2.1e| | 32 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 30 |
| Horn not working |1.7.3a| | 26 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 22 |
| Drive chain excessively tight |6.2.1d| | 18 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 16 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 16 |
| Front wheel bearings have excessive free play |2.3.5b| | 16 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 15 |
| Throttle operating incorrectly |6.2.1f| | 14 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 14 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 14 |
| 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| | 14 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 12 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 12 |
| Rear reflector missing (4.8.2 (a) (ii)) | 11 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 11 |
| Front Brake excessively binding (1.2.1 (f)) | 11 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 11 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 10 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 10 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 9 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 9 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 9 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Horn not working |7.7 |a| |ii|| | 8 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 8 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 8 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Handlebar deformed |2.1.1b| | 8 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 8 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 8 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 8 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 7 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Front Brake excessively binding |1.2.1 |f|| | 7 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 6 |
| Offside Front Direction indicators not working |1.5.1c| | 6 |
| Nearside Rear Direction indicators not working |1.5.1c| | 6 |
| Exhaust excessively deteriorated |7.1.1a| | 6 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 6 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 6 |
| Nearside Front Footrest insecure |6.2.1a| | 6 |
| Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Offside Rear Direction indicator not working |1.5.1c| | 5 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Exhaust has part of the system missing |7.1.1a| | 5 |
| Nearside Rear Footrest missing |6.2.1a| | 5 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 5 |
| Offside Rear Direction indicators not working |1.5.1c| | 5 |
| Rear Drive chain excessively loose |6.2.1d| | 5 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 5 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 5 |
| Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 5 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 5 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 5 |