| Most common failures | No# failures |
|---|
| Rear reflector on motorcycle missing |1.4.1| | 885 |
| Registration plate issues | 654 |
| Headlamp aim out of alignment | 553 |
| Drive chain excessively loose |6.2.1d| | 338 |
| Rear reflector missing (4.8.2 (a) (ii)) | 227 |
| Registration plate lamp issues | 215 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 140 |
| Drive chain worn to excess |6.2.1e| | 118 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 106 |
| Rear reflector missing |4.8.2 |a| |ii|| | 100 |
| Steering headbearing has excessive free play |2.2.2| | 84 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 83 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 79 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 79 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 74 |
| 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| | 73 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 73 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 67 |
| Rear Footrest missing |6.2.1a| | 66 |
| Nearside Rear Footrest missing |6.2.1a| | 65 |
| Offside Rear Footrest missing |6.2.1a| | 65 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 63 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 63 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 57 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 55 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 53 |
| Drive chain excessively tight |6.2.1d| | 52 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 49 |
| Horn not working |1.7.3a| | 48 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 46 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 44 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 44 |
| Throttle operating incorrectly |6.2.1f| | 40 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 38 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 38 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 36 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 35 |
| Horn not working (7.7 (a)) | 35 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 34 |
| Front position lamp incorrect colour |1.1.2a| | 33 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 33 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 32 |
| Offside Front Footrest insecure |6.2.1a| | 32 |
| Rear Footrest missing (6.2.12 (a)) | 32 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 30 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 30 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 29 |
| Offside Rear Footrest missing (6.2.12 (a)) | 29 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 28 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 28 |
| Offside Front Direction indicators not working |1.5.1c| | 27 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 27 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 27 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 27 |
| Front Brake excessively binding (1.2.1 (f)) | 27 |
| Rear Brake excessively binding (1.2.1 (f)) | 26 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 26 |
| Rear Drive chain excessively loose |6.2.1d| | 24 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 24 |
| Nearside Front Direction indicators not working |1.5.1c| | 23 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 23 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 23 |
| Stop lamp remains on when the brakes are released | 23 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 23 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 23 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition |8.1.1 |a|| | 22 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 22 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 21 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 21 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 20 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 20 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 19 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 19 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 18 |
| Rear reflector on motorcycle incorrectly positioned |1.4.2d| | 18 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 18 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 18 |
| Nearside Front Footrest insecure |6.2.1a| | 17 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 17 |
| Rear Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 17 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 17 |
| Offside Rear Direction indicator not working |1.5.1c| | 16 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 16 |
| Direction indicators not working |1.5.1c| | 16 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 16 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 16 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 16 |
| Centre Rear Rear reflector on motorcycle missing |1.4.1| | 15 |
| Nearside Front Direction indicator not working |1.5.1c| | 15 |
| Offside Front Direction indicator not working |1.5.1c| | 15 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 15 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 15 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 15 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 15 |
| Rear Brake disc|s| has excessive run out |3.2.A1m| | 15 |
| Stop lamp not working (4.3.1 (a) (ii)) | 15 |