| Most common failures | No# failures |
|---|
| Rear reflector on motorcycle missing |1.4.1| | 18 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 17 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 16 |
| Headlamp aim out of alignment | 16 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 14 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 13 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 10 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 9 |
| Drive chain excessively loose |6.2.1d| | 9 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 9 |
| Front wheel bearings have excessive free play |2.3.5b| | 9 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 8 |
| Drive chain worn to excess |6.2.1e| | 8 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Horn not working |1.7.3a| | 7 |
| Offside Rear Direction indicator not working |1.5.1c| | 6 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 6 |
| Direction indicators not working |1.5.1c| | 6 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 6 |
| Headlamp aim not tested |1.6| | 5 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 4 |
| Rear Wheel spoke excessively loose |4.2.1b| | 4 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 4 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Nearside Front Direction indicator not working |1.5.1c| | 4 |
| Nearside Rear Direction indicators not working |1.5.1c| | 4 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 3 |
| Rear Drive chain excessively loose |6.2.1d| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 3 |
| Offside Rear Footrest missing |6.2.1a| | 3 |
| Nearside Rear Footrest missing |6.2.1a| | 3 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 3 |
| Nearside Steering lock stop missing |2.1.3| | 3 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 3 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Headlamp insecure |1.2.3b| | 3 |
| 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| | 3 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 3 |
| Nearside Rear Direction indicator not working |1.5.1c| | 3 |
| Offside Front Direction indicator not working |1.5.1c| | 3 |
| Offside Rear Direction indicators not working |1.5.1c| | 3 |
| Front Wheel spoke excessively loose |4.2.1b| | 3 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Steering headbearing has excessive free play |2.2.2| | 3 |
| Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 2 |
| Fuel cap sealing washer missing |7.2.2c| | 2 |
| Offside Rear Direction indicator damaged and function impaired |1.5.3a| | 2 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Offside Steering lock stop ineffective |2.1.3| | 2 |
| Rear reflector on motorcycle obscured |1.4.1| | 2 |
| Rear Wheel spoke cracked. |4.2.1b| | 2 |
| Offside Steering lock stop missing |2.1.3| | 2 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 2 |
| Rear Wheel spoke missing |4.2.1b| | 2 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Nearside Front Direction indicator missing |1.5.1a| | 2 |
| Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 2 |
| Direction indicator not working |1.5.1c| | 2 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 2 |
| Centre Rear Upper Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 2 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Nearside Front Direction indicators not working |1.5.1c| | 2 |
| Offside Front Direction indicators not working |1.5.1c| | 2 |
| Handlebar deformed |2.1.1b| | 2 |
| Rear Direction indicators not working |1.5.1c| | 2 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Chain guard insecure |6.2.1c| | 2 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 2 |
| Front position lamp deteriorated and function impaired |1.1.1b| | 2 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 2 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Riders seat insecure |6.2.1a| | 2 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Inner Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Centre Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Brake master cylinder severely damaged |3.2.B1b| | 1 |
| Rear Direction indicator affected by the operation of another lamp |1.5.1c| | 1 |
| Nearside Rear Direction indicator damaged and function impaired |1.5.3a| | 1 |
| Front Brake lever is damaged and the brake cannot be readily applied |3.1.3c| | 1 |
| Fuel system component insecure |7.2.1b| | 1 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 1 |
| Rear Brake hose excessively kinked |3.2.B3a| | 1 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 1 |
| Front All position lamps do not illuminate immediately when switched on |1.1.3a| | 1 |
| Rear Direction indicators affected by the operation of another lamp |1.5.1c| | 1 |
| Front Steering lock stop missing |2.1.3| | 1 |
| Rear Footrest insecure |6.2.1a| | 1 |
| Floor brake test No brake control achieves an efficiency of 30%. |3.3.C1a| | 1 |
| Floor brake test Neither brake control achieves an efficiency of 25% |3.3.C1b| | 1 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 1 |
| Front Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Rear Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Front Wheel spoke missing |4.2.1b| | 1 |
| Front Brake master cylinder severely damaged |3.2.B1b| | 1 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 1 |
| Stop lamp insecure |1.3.3b| | 1 |
| Stop lamp emits other than a steady red light |1.3.1b| | 1 |
| Rear Brake caliper|s| securing bolt|s| missing |3.2.A1j| | 1 |
| Rear position lamp deteriorated and function impaired |1.1.1b| | 1 |
| Rear Direction indicator damaged and function impaired |1.5.3a| | 1 |
| Front Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Offside Front suspension assembly component loose |2.3.1| | 1 |
| Offside Front suspension assembly component missing |2.3.1| | 1 |
| Offside Front Direction indicator missing |1.5.1a| | 1 |
| Nearside Rear Direction indicator missing |1.5.1a| | 1 |
| Offside Rear Direction indicator missing |1.5.1a| | 1 |
| Brake pedal pivots excessively worn |3.1.3a| | 1 |
| Front Wheel bearing has excessive play |5.1.3 |a| |i|| | 1 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 1 |
| Rear Brake hose fouling Insecure |3.2.B3b| | 1 |
| Rear Brake pedal insecure |3.1.2a| | 1 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 1 |
| Fuel cap mounting flange/sealing method defective |7.2.2c| | 1 |
| Throttle operating incorrectly |6.2.1f| | 1 |
| Rear Rear reflector on motorcycle obscured |1.4.2b| | 1 |
| Front Direction indicators flashing more than 120 times per minute |1.5.1c| | 1 |
| Rear Direction indicators flashing more than 120 times per minute |1.5.1c| | 1 |
| Direction indicator affected by the operation of another lamp |1.5.1c| | 1 |
| Front wheel bearings are excessively rough |2.3.5b| | 1 |
| Lower Rear mono-shock pivot excessively worn |2.4.B.4| | 1 |
| Front Headlamp insecure |1.2.3b| | 1 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Front Front mudguard insecure |2.3.7| | 1 |
| Front Brake lever mounting insecure |3.1.2a| | 1 |
| Rear Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 1 |
| Nearside Fuel system component leaking |7.2.1a| | 1 |
| Front Riders seat insecure |6.2.1a| | 1 |
| Offside Rear Brake pedal is positioned so that the brake cannot be readily applied |3.1.3c| | 1 |
| Nearside Rear Drive chain worn to excess |6.2.1e| | 1 |
| Nearside Rear Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Outer Front Upper Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Centre Front Upper Front suspension fouling which affects the movement of the front suspension. |2.3.6a| | 1 |
| Centre Front Upper Front position lamp insecure |1.1.1c| | 1 |
| Offside Rear Upper Direction indicator insecure |1.5.3b| | 1 |
| Nearside Rear Lower Drive chain worn to excess |6.2.1e| | 1 |
| Nearside Front Lower Fuel system component leaking |7.2.1a| | 1 |
| Centre Rear Upper Rear reflector on motorcycle missing |1.4.1| | 1 |
| Outer Rear Lower Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Centre Front Upper Motorcycle structure excessively damaged |6.1.1a| | 1 |
| Front Direction indicators flashing less than 60 times a minute |1.5.1c| | 1 |
| Rear Direction indicators flashing less than 60 times a minute |1.5.1c| | 1 |
| Exhaust excessively deteriorated |7.1.1a| | 1 |
| Offside Rear Footrest insecure |6.2.1a| | 1 |
| Drive belt sprocket worn to excess both |6.2.1e| | 1 |
| Dipswitch does not extinquish main beam/s, leaving at least 1 dipped beam headlamp |1.2.2b|i|| | 1 |
| Front Brake caliper|s| insecure |3.2.A1j| | 1 |
| Rear wheel insecure |4.2.3b| | 1 |
| Front Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 1 |
| Front Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 1 |
| Rear wheel spindle securing nut|s| loose |2.4.A.2b| | 1 |
| Front Headlamp incorrect colour |1.2.1| | 1 |
| Front Horn not working |1.7.3a| | 1 |
| Rear Drive chain worn to excess |6.2.1e| | 1 |
| Front Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Front position lamp insecure |1.1.1c| | 1 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 1 |
| Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 1 |
| Front Brake disc|s| is excessively distorted |3.2.A1m| | 1 |
| Stop lamp does not illuminate immediately a brake applies Handle bar |1.3.1a| | 1 |
| Rear Stop lamp damaged and function impaired |1.3.3a| | 1 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 1 |
| Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Rear position lamp missing |1.1.1a| | 1 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 1 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 1 |
| Clutch lever shortened so it cannot be readily operated. |6.2.1g| | 1 |
| Offside Rear Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 1 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 1 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 1 |
| Front Direction indicator incorrect colour |1.5.1b| | 1 |
| Registration plate issues | 1 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 1 |
| Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 1 |
| Nearside Rear Footrest insecure |6.2.1a| | 1 |
| Rear Front wheel bearings have excessive free play |2.3.5b| | 1 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 1 |
| Nearside Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 1 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 1 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 1 |
| Brake lever attachment screws missing |3.1.2b| | 1 |
| Dipswitch does not deflect the main beam/s, making them into dipped beam/s |1.2.2b|ii|| | 1 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Front Direction indicators not working |1.5.1c| | 1 |
| Offside Rear Brake locking device missing |3.2.A1e| | 1 |
| Steering control handlebar movement restricted by taut cables |2.1.2c| | 1 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 1 |
| Offside Handlebar mounting clamp bolt loose |2.1.1a| | 1 |
| Front mudguard insecure |2.3.7| | 1 |
| Position lamp switch insecure |1.1.4b| | 1 |
| Rear position lamp insecure |1.1.1c| | 1 |
| Nearside Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 1 |
| Offside Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 1 |
| Front wheel spindle loose |2.3.5a| | 1 |
| Front Wheel has an excessively eccentric bead rim. |4.2.2| | 1 |
| Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Front Brake excessively binding (1.2.1 (f)) | 1 |
| Front Upper Position lamp not working (4.2.1 (a)) | 1 |
| Rear Brake lever pivot has excessive free play (1.1.1 (b)) | 1 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 1 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 1 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Rear Drive chain excessively loose (6.1.7 (c) (i)) | 1 |
| Rear Position lamp not working (4.2.1 (a)) | 1 |