| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 98 |
| Drive chain excessively loose |6.2.1d| | 57 |
| Drive chain worn to excess |6.2.1e| | 28 |
| Rear reflector on motorcycle missing |1.4.1| | 22 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 18 |
| Front wheel bearings are excessively rough |2.3.5b| | 16 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 15 |
| Registration plate issues | 15 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 15 |
| Front wheel bearings have excessive free play |2.3.5b| | 13 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 12 |
| Riders seat insecure |6.2.1a| | 11 |
| Rear reflector on motorcycle obscured |1.4.1| | 11 |
| Horn not working |1.7.3a| | 8 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 8 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 8 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 7 |
| Stop lamp remains on when the brake is released |1.3.1e| | 7 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 6 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 6 |
| Rear reflector missing (4.8.2 (a) (ii)) | 6 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 6 |
| Offside Front Direction indicator not working |1.5.1c| | 6 |
| Rear Position lamp not working (4.2.1 (a)) | 6 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 6 |
| Handlebar deformed |2.1.1b| | 6 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 5 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 5 |
| Drive chain excessively tight |6.2.1d| | 5 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Rear Drive chain excessively loose |6.2.1d| | 5 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 5 |
| Rear reflector missing |4.8.2 |a| |ii|| | 5 |
| Steering headbearing has excessive free play |2.2.2| | 5 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 5 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Rear Brake pedal has inadequate reserve travel (3.1.3b) | 5 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 4 |
| Front Brake excessively binding (1.2.1 (f)) | 4 |
| Stop lamp remains on when the brakes are released | 4 |
| Throttle operating incorrectly |6.2.1f| | 4 |
| Headlamp insecure |1.2.3b| | 4 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 4 |
| Offside Rear Direction indicator not working |1.5.1c| | 4 |
| Offside Rear Footrest missing |6.2.1a| | 3 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 3 |
| Front Position lamp not working (4.2.1 (a)) | 3 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 3 |
| Rear reflector on motorcycle obscured |1.4.2b| | 3 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 3 |
| Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Rear Drive chain sprocket worn to excess (6.2.1e) | 3 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 3 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 3 |
| Offside Rear Footrest missing (6.2.12 (a)) | 3 |
| Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 3 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 3 |
| Front Handlebar deformed |2.1.1b| | 2 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 2 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 2 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Nearside Rear Footrest insecure |6.2.1a| | 2 |
| Front Brake disc contaminated (1.1.14 (b)) | 2 |
| Rear Brake lagging in operation (1.2.1 (d)) | 2 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 2 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Rear Wheel bearing play so excessive that directional control is impaired (5.1.3 (a) (ii)) | 2 |
| Front Brake disc(s) has excessive run out (3.2.A1m) | 2 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 2 |
| Rear Brake lining(s) less than 1.5 mm thick (3.2.A1f(i)) | 2 |
| Drive chain excessively loose (6.2.1d) | 2 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 2 |
| Rear Brake linkage has abnormal movement due to maladjustment |3.2.A1i| | 2 |
| Rear shock absorber insecurely mounted |2.4.A.3b| | 2 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 2 |
| Drive chain worn to excess (6.2.1e) | 2 |
| Offside Rear Footrest insecure |6.2.1a| | 2 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 2 |
| Nearside Rear Direction indicator not working |1.5.1c| | 2 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 2 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 2 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 2 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 2 |
| Rear Wheel spoke missing |4.2.1b| | 2 |
| Rear Roller brake test indicates a sticking brake (3.3.A1a) | 2 |
| Rear Brake excessively binding (1.2.1 (f)) | 2 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 2 |
| Rear reflector defective or damaged by more than 50% of the reflecting surface (4.8.1 (a) (ii)) | 2 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 2 |
| Front Wheel spoke excessively loose |4.2.1b| | 2 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Nearside Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 2 |
| Front wheel bearings are excessively rough (2.3.5b) | 2 |
| Rear Drive chain worn to excess (6.2.1e) | 2 |
| Front Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 2 |
| Nearside Rear Footrest missing |6.2.1a| | 2 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 2 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 2 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 2 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 2 |
| All direction indicators not working (4.4.1 (a) (ii)) | 2 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 2 |
| Chain guard insecure (6.2.1c) | 2 |