| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 106 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 51 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 48 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 40 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 36 |
| Registration plate issues | 34 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 34 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 33 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 31 |
| Rear reflector on motorcycle missing |1.4.1| | 30 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 30 |
| Throttle operating incorrectly |6.2.1f| | 29 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 26 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 24 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 22 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 21 |
| Steering headbearing has excessive free play |2.2.2| | 21 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 19 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 18 |
| Horn not working |1.7.3a| | 17 |
| Drive chain excessively loose |6.2.1d| | 16 |
| Drive chain worn to excess |6.2.1e| | 16 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 15 |
| Drive chain excessively tight |6.2.1d| | 15 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 14 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 14 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 13 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 13 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 12 |
| Rear Brake disc|s| cracked |3.2.A1g| | 12 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 11 |
| Front Brake excessively binding (1.2.1 (f)) | 11 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 9 |
| Front wheel bearings are excessively rough |2.3.5b| | 9 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 8 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 8 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 7 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 7 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 6 |
| Headlamp aim beam image kick up to the offside |1.6| | 6 |
| Offside Front Brake disc|s| cracked |3.2.A1g| | 6 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 6 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 6 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 6 |
| Exhaust excessively deteriorated |7.1.1a| | 5 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 5 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 5 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 5 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 5 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 5 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 5 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 5 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 5 |
| Rear Drive chain excessively loose |6.2.1d| | 5 |
| 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| | 5 |
| Rear Brake pedal cracked |3.1.2c| | 5 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 5 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Front Brake excessively binding |1.2.1 |f|| | 4 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 4 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 4 |
| Nearside Front Brake disc|s| cracked |3.2.A1g| | 4 |
| Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 4 |
| Rear Brake locking device missing |3.2.A1e| | 4 |
| Nearside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 4 |
| Front Horn not working |1.7.3a| | 4 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 4 |
| Offside Handlebar deformed |2.1.1b| | 4 |
| Nearside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 4 |
| Rear Brake excessively binding (1.2.1 (f)) | 4 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Front Position lamp not working |4.2.1 |a|| | 3 |
| Lower Exhaust excessively deteriorated |7.1.1a| | 3 |
| Nearside Front Direction indicator not working |1.5.1c| | 3 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 3 |
| Nearside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Rear Brake caliper|s| insecure |3.2.A1j| | 3 |
| Headlamp switch faulty |1.2.4| | 3 |
| Front Brake disc|s| cracked |3.2.A1g| | 3 |
| Motorcycle structure cracked |6.1.1a| | 3 |
| Nearside Front Brake disc|s| has excessive run out |3.2.A1m| | 3 |
| Nearside Front Footrest insecure |6.2.1a| | 3 |
| Offside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 3 |
| Front Steering headbearing has excessive free play |2.2.2| | 3 |
| Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 3 |
| Front suspension has inadequate damping effect. |2.3.6c| | 3 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Nearside Footrest insecure |6.2.1a| | 3 |
| Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Centre Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 3 |
| Fuel system component insecure |7.2.1b| | 3 |
| Stop lamp remains on when the brakes are released | 3 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 3 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 3 |