| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 191 |
| Drive chain excessively loose |6.2.1d| | 66 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 57 |
| Registration plate lamp issues | 55 |
| Rear reflector on motorcycle missing |1.4.1| | 48 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 48 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 35 |
| Drive chain worn to excess |6.2.1e| | 35 |
| Registration plate issues | 32 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 32 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 29 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 27 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 19 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 19 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 18 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 17 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 17 |
| Handlebar deformed |2.1.1b| | 17 |
| Rear reflector missing (4.8.2 (a) (ii)) | 17 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 16 |
| Rear reflector on motorcycle obscured |1.4.1| | 14 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 14 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 12 |
| Rear Position lamp not working (4.2.1 (a)) | 12 |
| Drive chain excessively tight |6.2.1d| | 11 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 11 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 10 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 9 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 9 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 8 |
| Front Brake excessively binding (1.2.1 (f)) | 8 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 8 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 8 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 8 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 8 |
| Stop lamp remains on when the brakes are released | 8 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 7 |
| Horn not working |1.7.3a| | 7 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 7 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 7 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 7 |
| 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 |
| Front Position lamp not working (4.2.1 (a)) | 7 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 7 |
| Headlamp aim beam image kick up to the offside |1.6| | 6 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 6 |
| Steering headbearing has excessive free play |2.2.2| | 6 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 6 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 6 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 5 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 5 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 5 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 5 |
| Rear reflector missing |4.8.2 |a| |ii|| | 5 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 5 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 5 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 5 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 4 |
| Front suspension has inadequate damping effect. |2.3.6c| | 4 |
| Rear Footrest missing |6.2.1a| | 4 |
| Horn not working (7.7 (a)) | 4 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 4 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 4 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 4 |
| Brake pedal cannot be released smoothly |3.1.3d| | 4 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Rear Drive chain excessively loose |6.2.1d| | 4 |
| Exhaust excessively deteriorated |7.1.1a| | 4 |
| Headlamp insecure |1.2.3b| | 4 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 4 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 4 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 3 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 3 |
| Exhaust system insecure (6.1.2 (a)) | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 3 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 3 |
| Rear Drive chain sprocket excessively loose (6.1.7 (c) (i)) | 3 |
| Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 3 |
| Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 3 |
| Rear Position lamp not working |4.2.1 |a|| | 3 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Front Horn not working (7.7 (a)) | 3 |
| Offside Rear Footrest missing (6.2.12 (a)) | 3 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 3 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |
| Nearside Rear Footrest missing |6.2.1a| | 3 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Rear All position lamps do not illuminate immediately when switched on |1.1.3a| | 3 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 3 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 3 |
| Throttle control functioning such that safe operation of the motorcycle is adversely affected (6.2.7 (a) (ii)) | 3 |
| Headlamp aim not tested |1.6| | 3 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Front wheel bearings have excessive free play |2.3.5b| | 3 |
| Front mudguard insecure |2.3.7| | 3 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 3 |
| Rear Drive chain worn to excess |6.2.1e| | 3 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Rear Brake excessively binding |1.2.1 |f|| | 3 |
| Front Brake disc contaminated (1.1.14 (b)) | 3 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 3 |
| Horn not working |7.7 |a| |ii|| | 3 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 3 |