| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 67 |
| Rear reflector on motorcycle missing |1.4.1| | 55 |
| Drive chain excessively loose |6.2.1d| | 43 |
| Registration plate issues | 30 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 26 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 25 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 20 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 19 |
| Offside Rear Footrest missing |6.2.1a| | 17 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 16 |
| Nearside Rear Footrest missing |6.2.1a| | 14 |
| Offside Rear Direction indicator not working |1.5.1c| | 14 |
| Throttle operating incorrectly |6.2.1f| | 12 |
| Steering headbearing has excessive free play |2.2.2| | 12 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 12 |
| Drive chain worn to excess |6.2.1e| | 11 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 10 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 9 |
| Horn not working |1.7.3a| | 8 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 8 |
| Nearside Rear Direction indicator not working |1.5.1c| | 8 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 8 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 8 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Drive chain excessively tight |6.2.1d| | 7 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 7 |
| Fuel system component insecure |7.2.1b| | 7 |
| Front Steering headbearing has excessive free play |2.2.2| | 7 |
| Front suspension has inadequate damping effect. |2.3.6c| | 6 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 6 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 6 |
| Headlamp switch faulty |1.2.4| | 6 |
| Offside Front Direction indicators not working |1.5.1c| | 6 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 6 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 6 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 6 |
| Offside Front Direction indicator not working |1.5.1c| | 6 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 5 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 5 |
| Fuel system component leaking |7.2.1a| | 5 |
| Rear Footrest missing |6.2.1a| | 5 |
| Nearside Front Direction indicator not working |1.5.1c| | 5 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Rear Drive chain excessively loose |6.2.1d| | 4 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 4 |
| Direction indicators not working |1.5.1c| | 4 |
| Offside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 4 |
| Nearside Front Direction indicator damaged and function impaired |1.5.3a| | 4 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Front position lamp incorrect colour |1.1.2a| | 4 |
| Offside Steering lock stop ineffective |2.1.3| | 4 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 4 |
| Rear position lamp insecure |1.1.1c| | 4 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 4 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 4 |
| An item not tested |Manual| | 4 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 4 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 4 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 4 |
| Nearside Rear Direction indicators not working |1.5.1c| | 3 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 3 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Nearside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 3 |
| Front wheel bearings have excessive free play |2.3.5b| | 3 |
| Clutch lever shortened so it cannot be readily operated. |6.2.1g| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 3 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 3 |
| Offside Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Offside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Front Brake pipe inadequately supported |3.2.B2b| | 3 |
| Centre Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Front wheel bearings are excessively rough |2.3.5b| | 3 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Offside Rear Direction indicators not working |1.5.1c| | 3 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 3 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 3 |
| Front Direction indicators not working |1.5.1c| | 3 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 3 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Front Brake excessively binding (1.2.1 (f)) | 3 |
| Rear Brake master cylinder insecurely mounted |3.2.B1a| | 2 |
| Front Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 2 |
| Rear Stop lamp insecure |1.3.3b| | 2 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 2 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 2 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Front Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 2 |
| Nearside Fairings insecure and likely to impede the steering |2.1.2e| | 2 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 2 |
| Stop lamp insecure |1.3.3b| | 2 |
| Brake pedal insecure |3.1.2a| | 2 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 2 |
| Front position lamp deteriorated and function impaired |1.1.1b| | 2 |
| Front Steering movement excessively stiff with the wheel raised |2.2.1b| | 2 |
| Steering control handlebar movement restricted by cables caught on a projection |2.1.2c| | 2 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 2 |
| Nearside Front Direction indicator missing |1.5.1a| | 2 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 2 |
| Front Direction indicator not working |1.5.1c| | 2 |
| Rear Drive chain worn to excess |6.2.1e| | 2 |
| Nearside Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 2 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 2 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 2 |
| Rear Stop lamp does not emit a steady light |1.3.1b| | 2 |
| Rear Exhaust excessively deteriorated |7.1.1a| | 2 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 2 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 2 |
| Rear position lamp obscured more than 50% |1.1.1d| | 2 |
| Nearside Handlebar deformed |2.1.1b| | 2 |
| Lower Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Nearside Front Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 2 |
| Offside Front Direction indicator insecure |1.5.3b| | 2 |
| Nearside Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Offside Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Lower Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 2 |
| Nearside Front Brake lever cannot be applied smoothly |3.1.3d| | 2 |
| Nearside Steering lock stop ineffective |2.1.3| | 2 |
| Offside Handlebar deformed |2.1.1b| | 2 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 2 |
| Offside Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 2 |
| Front Front position lamp incorrect colour |1.1.2a| | 2 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 2 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 2 |
| Rear Rear position lamp insecure |1.1.1c| | 2 |
| Lower Rear mono-shock pivot excessively worn |2.4.B.4| | 2 |