| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 191 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 74 |
| Rear reflector missing (4.8.2 (a) (ii)) | 49 |
| Front Brake excessively binding (1.2.1 (f)) | 45 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 43 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 35 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 30 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 26 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 25 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 24 |
| Headlamp insecure (4.1.1 (c)) | 21 |
| Rear Brake excessively binding (1.2.1 (f)) | 21 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 21 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 20 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 20 |
| Horn not working (7.7 (a)) | 20 |
| Stop lamp not working (4.3.1 (a) (ii)) | 19 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 17 |
| Horn not working |7.7 |a| |ii|| | 17 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 17 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 17 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 16 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 16 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 16 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 15 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 15 |
| Rear Position lamp not working (4.2.1 (a)) | 15 |
| Handlebar deformed to the extent that steering is affected (2.2.1 (c) (ii)) | 14 |
| Stop lamp remains on when the brakes are released | 14 |
| Horn not working (7.7 (a) (ii)) | 14 |
| Drive chain excessively loose |6.2.1d| | 14 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 14 |
| All direction indicators not working (4.4.1 (a) (ii)) | 14 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 13 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 13 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 13 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 12 |
| Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 12 |
| Front Position lamp not working (4.2.1 (a)) | 12 |
| Rear reflector missing |4.8.2 |a| |ii|| | 12 |
| Headlamp aim not tested (4.1.2 (b)) | 12 |
| Handlebar fouling on the fuel tank or bodywork on full lock (2.1.4 (b)) | 12 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 12 |
| Handlebar deformed to the extent that steering is affected |2.2.1 |c| |ii|| | 10 |
| Front Brake excessively binding |1.2.1 |f|| | 10 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 9 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 9 |
| Registration plate lamp issues | 9 |
| Registration plate issues | 9 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 9 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 8 |
| Dipswitch does not operate immediately when selected on main beam (4.1.3 (b)) | 8 |
| Rear Drive chain excessively loose (6.1.7 (c) (i)) | 8 |
| Horn not working |1.7.3a| | 8 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 8 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 8 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 8 |
| Handlebar deformed |2.1.1b| | 8 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 8 |
| Handlebar excessively deformed (2.2.1 (c) (i)) | 7 |
| Rear reflector on motorcycle obscured |1.4.2b| | 7 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 7 |
| Rear Wheel spindle loose (5.2.1 (c) (i)) | 7 |
| Front Headlamp insecure (4.1.1 (c)) | 7 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 7 |
| Front Brake grabbing severely (1.2.1 (c)) | 7 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 6 |
| Front Headlamp not working on main beam (4.1.1 (a) (ii)) | 6 |
| Rear reflector on motorcycle missing |1.4.1| | 6 |
| Stop lamp not working |4.3.1 |a| |ii|| | 6 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 6 |
| Brake pedal has insufficient reserve travel (1.1.2 (a)) | 6 |
| Rear Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 6 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 6 |
| Handlebar excessively deformed |2.2.1 |c| |i|| | 5 |
| Brake performance not tested (1.2.1 (g)) | 5 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 5 |
| Rear Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 5 |
| Throttle control functioning such that safe operation of the motorcycle is adversely affected (6.2.7 (a) (ii)) | 5 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 5 |
| Rear Brake excessively binding |1.2.1 |f|| | 5 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 5 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 5 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 5 |
| Drive chain so worn it is likely to fail |6.1.7 |c| |ii|| | 4 |
| Drive chain horseshoe locking device incorrectly fitted |6.1.7 |j| |i|| | 4 |
| Drive chain excessively tight, so that it is likely to fail |6.1.7 |k| |ii|| | 4 |
| Rear Brake pedal has insufficient reserve travel |1.1.2 |a|| | 4 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 4 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Offside Front Direction indicator likely to become detached (4.4.1 (c) (ii)) | 4 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 4 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 4 |
| Rear Drive chain sprocket so worn it is likely to fail (6.1.7 (c) (ii)) | 4 |
| Clutch lever positioned so it cannot be readily operated (6.2.7 (b)) | 4 |
| Rear Drive chain worn to excess (6.1.7 (c) (i)) | 4 |
| Rear Brake pedal not releasing correctly and functionality of brakes affected (1.1.2 (b) (ii)) | 4 |
| Rear Brake pedal is bent and the brake cannot be readily applied (1.1.2 (d)) | 4 |
| Nearside Rear Drive chain excessively loose (6.1.7 (c) (i)) | 4 |
| Fuel cap ineffective (6.1.3 (b) (i)) | 4 |
| Front Shock absorber has negligible damping effect (5.3.2 (b)) | 4 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Front Brake disc significantly and obviously worn |1.1.14 |a| |i|| | 4 |
| Rear Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 4 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Nearside Rear Drive chain worn to excess (6.1.7 (c) (i)) | 4 |