| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 192 |
| Drive chain excessively loose |6.2.1d| | 123 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 121 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 85 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 60 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 59 |
| Drive chain worn to excess |6.2.1e| | 55 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 44 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 43 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 43 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 38 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 36 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 35 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 31 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 31 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 30 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 29 |
| Registration plate issues | 28 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 26 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 25 |
| Handlebar deformed |2.1.1b| | 25 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 23 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 23 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 23 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 22 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 22 |
| Front Brake excessively binding (1.2.1 (f)) | 22 |
| Rear reflector on motorcycle missing |1.4.1| | 20 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 19 |
| Headlamp aim beam image kick up to the offside |1.6| | 19 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 18 |
| Horn not working |1.7.3a| | 18 |
| Throttle operating incorrectly |6.2.1f| | 18 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 17 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 16 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 16 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 16 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 16 |
| Rear Brake excessively binding (1.2.1 (f)) | 16 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 15 |
| Drive chain excessively tight |6.2.1d| | 14 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 14 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 12 |
| Front wheel bearings have excessive free play |2.3.5b| | 12 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 12 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 11 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 11 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 11 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 11 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 11 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 10 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 10 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 10 |
| Stop lamp remains on when the brake is released |1.3.1e| | 10 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 10 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 10 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 9 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 9 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 9 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 9 |
| Offside Front position lamp does not illuminate immediately when switched on |1.1.3a| | 9 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 9 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 9 |
| Rear Position lamp not working (4.2.1 (a)) | 9 |
| Front Brake excessively binding |1.2.1 |f|| | 8 |
| Exhaust excessively deteriorated |7.1.1a| | 8 |
| Rear Drive chain worn to excess |6.2.1e| | 7 |
| Rear Drive chain excessively loose |6.2.1d| | 7 |
| Nearside Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 7 |
| Nearside Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Steering headbearing has excessive free play |2.2.2| | 7 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 7 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 7 |
| Dipswitch does not extinquish main beam/s, leaving at least 1 dipped beam headlamp |1.2.2b|i|| | 6 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 6 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 6 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 6 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 6 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 6 |
| Front suspension has inadequate damping effect. |2.3.6c| | 6 |
| Offside Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 6 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 6 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 6 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 6 |
| Rear Brake excessively binding |1.2.1 |f|| | 5 |
| Front Handlebar deformed |2.1.1b| | 5 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 5 |
| Nearside Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Stop lamp remains on when the brakes are released | 5 |
| Direction indicators not working |1.5.1c| | 5 |
| Front position lamp incorrect colour |1.1.2a| | 5 |
| Headlamp switch faulty |1.2.4| | 5 |
| Lower Rear suspension bush has excessive free play |2.4.A2a|i|| | 5 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 5 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 5 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 5 |
| Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Rear Footrest missing |6.2.1a| | 5 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 5 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 5 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 5 |
| Dipswitch does not deflect the main beam/s, making them into dipped beam/s |1.2.2b|ii|| | 5 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 5 |
| Brake lever has inadequate reserve travel |3.1.3b| | 5 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 5 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Offside Rear Footrest missing |6.2.1a| | 4 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 4 |
| Nearside Front Direction indicator not working |1.5.1c| | 4 |
| Headlamp aim so that beam "kick up" is not visible on the screen |4.1.2 |a|| | 4 |
| Rear Brake disc|s| cracked |3.2.A1g| | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Offside Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 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 |
| Steering control has Insufficient clearance at full lock affecting the riders operation of the controls |2.1.2b| | 4 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 4 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Horn not working |7.7 |a| |ii|| | 4 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 4 |
| Registration plate lamp issues | 4 |
| Handlebar mounting clamp loose |2.1.1a| | 4 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 4 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 4 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 4 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 4 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 4 |