| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 34 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 21 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 12 |
| Horn not working |1.7.3a| | 11 |
| Rear reflector on motorcycle missing |1.4.1| | 11 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 11 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 10 |
| Steering headbearing has excessive free play |2.2.2| | 9 |
| Front Steering headbearing has excessive free play |2.2.2| | 7 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 6 |
| Throttle operating incorrectly |6.2.1f| | 6 |
| Registration plate issues | 6 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 6 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 6 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 6 |
| Riders seat insecure |6.2.1a| | 5 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 5 |
| Fuel system component insecure |7.2.1b| | 4 |
| Front wheel bearings are excessively rough |2.3.5b| | 4 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Rear Wheel spoke excessively loose |4.2.1b| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 3 |
| Fuel system component leaking |7.2.1a| | 3 |
| Fuel cap sealing washer deteriorated |7.2.2c| | 3 |
| Horn missing |1.7.1| | 3 |
| Fuel hose leaking |7.2.1a| | 3 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Front suspension assembly component loose |2.3.1| | 2 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Offside Front Footrest insecure |6.2.1a| | 2 |
| Front Steering lock stop maladjusted |2.1.3| | 2 |
| Rear Brake reaction bracket securing bolt|s| missing |3.2.A1j| | 2 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 2 |
| Rear Brake pedal is positioned so that the brake cannot be readily applied |3.1.3c| | 2 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 2 |
| Fuel cap sealing washer missing |7.2.2c| | 2 |
| Footrest insecure |6.2.1a| | 2 |
| Front suspension has inadequate damping effect. |2.3.6c| | 2 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 2 |
| Direction indicators not working |1.5.1c| | 2 |
| 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| | 2 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Handlebar mounting excessively deteriorated |flexible type| |2.1.1d| | 2 |
| Headlamp switch faulty |1.2.4| | 2 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 2 |
| Front Brake lever insecure |3.1.2a| | 2 |
| Fuel cap sealing washer torn |7.2.2c| | 2 |
| Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Front Brake lever is inoperative |3.1.3c| | 1 |
| Front Handlebar mounting clamp loose |2.1.1a| | 1 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Rear Rear wheel rotation likely to be impeded |6.2.1b| | 1 |
| Front Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 1 |
| Nearside Front Footrest insecure |6.2.1a| | 1 |
| Centre Rear Lower Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 1 |
| Outer Rear Lower Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 1 |
| Offside Footrest insecure |6.2.1a| | 1 |
| Rear wheel spindle securing nut locking device insecure |2.4.A.2b| | 1 |
| Offside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Wheel spoke excessively loose |4.2.1b| | 1 |
| Front Horn not working |1.7.3a| | 1 |
| Front Headlamp switch faulty |1.2.4| | 1 |
| Front Brake back plate|s| insecure |3.2.A1j| | 1 |
| Brake lever is positioned so that the brake cannot be readily applied |3.1.3c| | 1 |
| Drive chain excessively loose |6.2.1d| | 1 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 1 |
| Offside Front Brake locking device insecure |3.2.A1e| | 1 |
| Nearside Rear Brake locking device insecure |3.2.A1e| | 1 |
| Front Direction indicator affected by the operation of another lamp |1.5.1c| | 1 |
| Rear Direction indicator affected by the operation of another lamp |1.5.1c| | 1 |
| Front Fuel hose leaking |7.2.1a| | 1 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 1 |
| Front Direction indicators not working |1.5.1c| | 1 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 1 |
| Brake lever insecure |3.1.2a| | 1 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Front Footrest insecure |6.2.1a| | 1 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 1 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 1 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 1 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 1 |
| Rear Wheel spoke cracked. |4.2.1b| | 1 |
| Rear Riders seat insecure |6.2.1a| | 1 |
| Offside Rear Direction indicators not working |1.5.1c| | 1 |
| Drive chain worn to excess |6.2.1e| | 1 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Rear shock absorber insecurely mounted |2.4.A.3b| | 1 |
| Front Handlebar deformed |2.1.1b| | 1 |
| Front Steering control handlebar movement restricted by taut cables |2.1.2c| | 1 |
| Front Rear suspension component loose |2.4.A.1a| | 1 |
| Front Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 1 |
| Front Throttle operating incorrectly |6.2.1f| | 1 |
| Nearside Front wheel bearings are excessively rough |2.3.5b| | 1 |
| Offside Front wheel bearings are excessively rough |2.3.5b| | 1 |
| Nearside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 1 |
| Front Brake reaction bracket insecure |3.2.A1j| | 1 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 1 |
| Rear Drive chain excessively tight |6.2.1d| | 1 |
| Nearside Sidecar suspension has an insecure unit. |5.2.3a| | 1 |
| Front Lower Steering headbearing has excessive free play |2.2.2| | 1 |
| Headlamp aim not tested |1.6| | 1 |
| Nearside Rear shock absorber insecurely mounted |2.4.A.3b| | 1 |
| Offside Rear shock absorber insecurely mounted |2.4.A.3b| | 1 |
| Rear Exhaust excessively deteriorated |7.1.1a| | 1 |
| Front Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 1 |
| Rear Rear suspension bearing has excessive free play |2.4.A2a|i|| | 1 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 1 |
| Rear Position lamp not working (4.2.1 (a)) | 1 |
| Stop lamp not working (4.3.1 (a) (ii)) | 1 |
| Clutch lever positioned so it cannot be readily operated. |6.2.1g| | 1 |
| Front wheel spindle securing nut locking device insecure |2.3.3a| | 1 |
| Offside Front Brake lever has inadequate reserve travel |3.1.3b| | 1 |
| Front wheel bearings have excessive free play |2.3.5b| | 1 |
| Offside Rear suspension component loose |2.4.A.1a| | 1 |
| Headlamp insecure |1.2.3b| | 1 |
| Centre Steering headbearing has excessive free play |2.2.2| | 1 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 1 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Rear wheel spindle securing nut|s| loose |2.4.A.2b| | 1 |
| Rear wheel rotation likely to be impeded |6.2.1b| | 1 |
| Chain guard fouling another component |6.2.1c| | 1 |
| Offside Front Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 1 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 1 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 1 |
| Front Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Front Wheel spoke excessively loose |4.2.1b| | 1 |
| Steering linkage has excessive free play |2.2.2| | 1 |
| Outer Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Centre Front Horn not working |1.7.3a| | 1 |
| Headlamp at least one does not illuminate on main beam when handlebars are moved |1.2.2a|ii|| | 1 |
| Offside Front Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Offside Rear Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Nearside Front Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Nearside Rear Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 1 |
| Front Brake drum|s| friction surface contaminated by oil or grease |3.2.A1k| | 1 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Front Headlamp aim not tested |1.6| | 1 |
| Handlebar mounting clamp loose |2.1.1a| | 1 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 1 |
| Front Front mudguard insecure |2.3.7| | 1 |