| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 410 |
| Registration plate issues | 176 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 106 |
| Horn not working |1.7.3a| | 96 |
| Rear reflector on motorcycle missing |1.4.1| | 86 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 81 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 79 |
| 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| | 69 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 67 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 60 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 52 |
| Drive chain excessively loose |6.2.1d| | 51 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 49 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 48 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 48 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 46 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 39 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 39 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 38 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 29 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 25 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 23 |
| Steering headbearing has excessive free play |2.2.2| | 21 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 21 |
| Drive chain excessively tight |6.2.1d| | 20 |
| Nearside Front Direction indicator not working |1.5.1c| | 20 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 19 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 19 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 18 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 18 |
| Headlamp aim beam image kick up to the offside |1.6| | 17 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 16 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 16 |
| Rear Brake disc|s| cracked |3.2.A1g| | 15 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 15 |
| Throttle operating incorrectly |6.2.1f| | 15 |
| Offside Front Footrest insecure |6.2.1a| | 15 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 15 |
| Registration plate lamp issues | 14 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Direction indicators not working |1.5.1c| | 14 |
| Brake lever has inadequate reserve travel |3.1.3b| | 14 |
| Offside Front Direction indicator not working |1.5.1c| | 13 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 13 |
| Drive chain worn to excess |6.2.1e| | 13 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 13 |
| Rear Brake excessively binding (1.2.1 (f)) | 13 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 12 |
| Nearside Rear Direction indicator not working |1.5.1c| | 12 |
| Offside Front Direction indicators not working |1.5.1c| | 12 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 12 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 11 |
| Nearside Front Direction indicators not working |1.5.1c| | 11 |
| Rear reflector missing (4.8.2 (a) (ii)) | 11 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 11 |
| Nearside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 10 |
| Horn not working (7.7 (a)) | 10 |
| Rear Position lamp not working (4.2.1 (a)) | 10 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 10 |
| Rear Exhaust markings indicating not for road use or similar wording |7.1.4| | 10 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 9 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 9 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 8 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 8 |
| Stop lamp remains on when the brake is released |1.3.1e| | 8 |
| Nearside Front Footrest insecure |6.2.1a| | 8 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 8 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 7 |
| Rear 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 hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 7 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 7 |
| Stop lamp remains on when the brakes are released | 7 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 7 |
| Front Steering headbearing has excessive free play |2.2.2| | 7 |
| Horn not working (7.7 (a) (ii)) | 7 |
| Offside Handlebar deformed |2.1.1b| | 7 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 6 |
| Front Position lamp not working (4.2.1 (a)) | 6 |
| Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 6 |
| Offside Rear Direction indicators not working |1.5.1c| | 6 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 6 |
| Offside Rear Direction indicator not working |1.5.1c| | 6 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 6 |
| Front Horn not working |1.7.3a| | 6 |
| Offside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 6 |