| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 62 |
| Drive chain excessively loose |6.2.1d| | 58 |
| Handlebar mounting excessively deteriorated |flexible type| |2.1.1d| | 55 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 48 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 38 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 38 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 38 |
| Drive chain worn to excess |6.2.1e| | 34 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 26 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 24 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 24 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 24 |
| Handlebar mounting clamp loose |2.1.1a| | 23 |
| Registration plate issues | 22 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 19 |
| Headlamp aim beam image kick up to the offside |1.6| | 18 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 16 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 15 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 15 |
| Riders seat insecure |6.2.1a| | 14 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 14 |
| Front wheel bearings have excessive free play |2.3.5b| | 13 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 12 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 12 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 12 |
| Rear reflector on motorcycle missing |1.4.1| | 11 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 11 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 11 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 10 |
| Chain guard insecure |6.2.1c| | 10 |
| Front Wheel spoke excessively loose |4.2.1b| | 10 |
| Registration plate lamp issues | 9 |
| Front wheel bearings are excessively rough |2.3.5b| | 9 |
| Rear Wheel spoke excessively loose |4.2.1b| | 9 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 9 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 9 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 8 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 8 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 8 |
| Offside Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 8 |
| Rear Wheel spoke cracked. |4.2.1b| | 8 |
| Nearside Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 8 |
| Horn not working |1.7.3a| | 8 |
| Nearside Rear Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 7 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 7 |
| Headlamp aim not tested |1.6| | 7 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 7 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 6 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 6 |
| Drive chain excessively tight |6.2.1d| | 6 |
| Offside Rear Direction indicator not working |1.5.1c| | 6 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 6 |
| 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| | 6 |
| Nearside Rear Direction indicator not working |1.5.1c| | 6 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 6 |
| Front Handlebar mounting excessively deteriorated |flexible type| |2.1.1d| | 6 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 6 |
| Rear Drive chain excessively loose |6.2.1d| | 6 |
| Nearside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 6 |
| Offside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 6 |
| Throttle operating incorrectly |6.2.1f| | 5 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 5 |
| Rear Position lamp not working (4.2.1 (a)) | 5 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Handlebar mounting insecure (2.2.1 (a) (i)) | 4 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 4 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 4 |
| Offside Front Direction indicator not working |1.5.1c| | 4 |
| Rear Wheel spoke missing |4.2.1b| | 4 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 4 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 4 |
| Offside Rear Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 4 |
| Rear Rear suspension bearing has excessive free play |2.4.A2a|i|| | 4 |
| Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Front Headlamp aim beam image kick-up is to the offside |1.6.1| | 4 |
| Offside Rear Footrest missing |6.2.1a| | 4 |
| Nearside Rear Direction indicators not working |1.5.1c| | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 4 |
| Exhaust excessively deteriorated |7.1.1a| | 4 |
| Rear Drive chain worn to excess |6.2.1e| | 4 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 4 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 3 |
| Rear reflector on motorcycle obscured |1.4.1| | 3 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 3 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Offside Steering lock stop ineffective |2.1.3| | 3 |
| Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 3 |
| An item not tested |Manual| | 3 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 3 |
| Nearside Rear Footrest missing |6.2.1a| | 3 |
| Rear All position lamps do not illuminate immediately when switched on |1.1.3a| | 3 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 3 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Headlamp insecure |1.2.3b| | 3 |
| Centre Front Upper Handlebar mounting clamp loose |2.1.1a| | 3 |
| Front mudguard insecure |2.3.7| | 3 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Steering headbearing has excessive free play |2.2.2| | 3 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 3 |
| Headlamp insecure (4.1.1 (c)) | 2 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 2 |
| Steering operation restricted in free movement from lock to lock (2.1.4 (c)) | 2 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Fuel cap sealing washer deteriorated |7.2.2c| | 2 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 2 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 2 |
| Front Brake component worn and seriously reduced in strength |3.2.A1| | 2 |
| Offside Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Steering linkage has excessive free play |2.2.2| | 2 |
| Fuel system component insecure |7.2.1b| | 2 |
| Offside Handlebar mounting excessively deteriorated |flexible type| |2.1.1d| | 2 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 2 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 2 |
| Offside Front Lower Motorcycle structure cracked |6.1.1a| | 2 |
| Nearside Handlebar mounting excessively deteriorated |flexible type| |2.1.1d| | 2 |
| Steering movement excessively rough with the wheel raised |2.2.1b| | 2 |
| Front Handlebar mounting clamp loose |2.1.1a| | 2 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 2 |
| Rear position lamp missing |1.1.1a| | 2 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 2 |
| Fuel cap sealing washer missing |7.2.2c| | 2 |
| Nearside Front Direction indicator insecure |1.5.3b| | 2 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 2 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 2 |
| Nearside Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Exhaust system insecure (6.1.2 (a)) | 2 |
| Seat insecure |6.2.1a| | 2 |
| Offside Front Handlebar mounting clamp bolt loose |2.1.1a| | 2 |
| Nearside Front Handlebar mounting clamp bolt loose |2.1.1a| | 2 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Front position lamp incorrect colour |1.1.2a| | 2 |
| Offside Direction indicator not working |1.5.1c| | 2 |
| Offside Rear Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Nearside Chain guard insecure |6.2.1c| | 2 |
| Front Stop lamp does not illuminate immediately a brake applies (1.3.1a) | 2 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 2 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 2 |
| Front Steering lock stop missing |2.1.3| | 2 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 2 |
| Handlebar deformed |2.1.1b| | 2 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 2 |
| Rear position lamp does not illuminate immediately when it is switched on (1.1.3a) | 2 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Front Brake excessively binding (1.2.1 (f)) | 2 |
| Rear position lamp incorrect colour |1.1.2b| | 2 |
| Exhaust mounting missing |7.1.1c| | 2 |