| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 106 |
| Drive chain excessively loose |6.2.1d| | 41 |
| Rear reflector on motorcycle missing |1.4.1| | 37 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 32 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 21 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 21 |
| Registration plate lamp issues | 20 |
| Registration plate issues | 19 |
| Drive chain worn to excess |6.2.1e| | 19 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 19 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 19 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 16 |
| Handlebar deformed |2.1.1b| | 12 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Steering headbearing has excessive free play |2.2.2| | 10 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 10 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 9 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 9 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 9 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 9 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 8 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 8 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 8 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 7 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 7 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Rear reflector missing (4.8.2 (a) (ii)) | 6 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Drive chain excessively tight |6.2.1d| | 6 |
| Rear reflector on motorcycle obscured |1.4.1| | 6 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 5 |
| Rear Brake locking device missing |3.2.A1e| | 5 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 5 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 5 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 5 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 5 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 4 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Brake pedal cannot be released smoothly |3.1.3d| | 4 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Front Brake excessively binding (1.2.1 (f)) | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Rear reflector on motorcycle obscured |1.4.2b| | 4 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 4 |
| Horn not working |1.7.3a| | 4 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Nearside Rear Footrest missing |6.2.1a| | 4 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 4 |
| Throttle operating incorrectly |6.2.1f| | 4 |
| Headlamp aim so that beam "kick up" is not visible on the screen |1.6.B.1| | 4 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 3 |
| Front suspension has inadequate damping effect. |2.3.6c| | 3 |
| Rear reflector missing |4.8.2 |a| |ii|| | 3 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 3 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 3 |
| Stop lamp remains on when the brakes are released | 3 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Headlamp insecure |1.2.3b| | 3 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 3 |
| Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 3 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 3 |
| Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 3 |
| Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Rear Brake pedal not releasing correctly and functionality of brakes affected |1.1.2 |b| |ii|| | 2 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Rear Lower Brake locking device missing |3.2.A1e| | 2 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Front Front suspension has inadequate damping effect. |2.3.6c| | 2 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Rear Position lamp not working (4.2.1 (a)) | 2 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 2 |
| Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 2 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 2 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 2 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 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 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 2 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Nearside Rear Direction indicators not working |1.5.1c| | 2 |
| Fuel system component leaking |7.2.1a| | 2 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 2 |
| Front Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 2 |
| Rear Brake excessively binding |1.2.1 |f|| | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Rear Wheel has an excessively eccentric bead rim. |4.2.2| | 2 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 2 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 2 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 2 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Front Brake lever is so short that the brake cannot be readily applied |1.1.2 |d|| | 2 |
| Brake pedal has insufficient reserve travel (1.1.2 (a)) | 2 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 2 |
| Front Wheel spoke excessively loose |4.2.1b| | 2 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 2 |
| Rear Wheel has an excessively distorted bead rim. |4.2.2| | 2 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 2 |
| Front Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 2 |
| Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 2 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Front Brake excessively binding |1.2.1 |f|| | 2 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Front Fuel cap ineffective |6.1.3 |b| |i|| | 2 |