| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 44 |
| Drive chain excessively loose |6.2.1d| | 11 |
| Rear reflector on motorcycle missing |1.4.1| | 6 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 5 |
| Drive chain excessively tight |6.2.1d| | 4 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Registration plate issues | 4 |
| Steering headbearing has excessive free play |2.2.2| | 4 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 3 |
| Rear Drive chain excessively loose |6.2.1d| | 3 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 2 |
| Rear Brake excessively binding |1.2.1 |f|| | 2 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Handlebar deformed |2.1.1b| | 2 |
| Steering movement excessively rough with the weight on the lower bearing |2.2.1a| | 2 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Horn not working |7.7 |a| |ii|| | 2 |
| Rear reflector on motorcycle obscured |1.4.1| | 2 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Locking device|s| 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 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 2 |
| Brake lever cannot be applied smoothly |3.1.3d| | 2 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 2 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 1 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 1 |
| Valve stem seriously damaged Both (5.2.3 (j)) | 1 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 1 |
| Stop lamp remains on when the brakes are released | 1 |
| Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Offside Rear Direction indicators not working |1.5.1c| | 1 |
| Nearside Front Direction indicators not working |1.5.1c| | 1 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Front Shock absorber has negligible damping effect (5.3.2 (b)) | 1 |
| Front Stop lamp not working front control |4.3.1 |a| |ii|| | 1 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 1 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Front Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 1 |
| Offside Front Lower Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 1 |
| Front Upper Steering headbearing has excessive free play |2.2.2| | 1 |
| Direction indicator missing |1.5.1a| | 1 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 1 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 1 |
| Brake lever is bent and the brake cannot be readily applied (1.1.2 (d)) | 1 |
| Rear Brake excessively binding (1.2.1 (f)) | 1 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Drive chain sprocket so worn it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Throttle control functioning such that safe operation of the motorcycle is adversely affected insecure (6.2.7 (a) (ii)) | 1 |
| Chain guard insecure |6.2.1c| | 1 |
| Offside Direction indicator not working front and rear |1.5.1c| | 1 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 1 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 1 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Nearside Handlebar deformed |2.1.1b| | 1 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 1 |
| Front Stop lamp not working lever |4.3.1 |a| |ii|| | 1 |
| Horn not working (7.7 (a)) | 1 |
| Offside Front Floor brake test indicates a binding brake |3.3.C2c| | 1 |
| Offside Front Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 1 |
| Rear Drive chain sprocket so worn it is likely to fail |6.1.7 |c| |ii|| | 1 |
| Rear Position lamp not working (4.2.1 (a)) | 1 |
| Fuel cap mounting flange/sealing method defective corroded
|7.2.2c| | 1 |
| Headlamp insecure |1.2.3b| | 1 |
| Front suspension fouling which affects the movement of the front suspension. head light hitting front mudguard |2.3.6a| | 1 |
| Nearside Front Direction indicator not working |4.4.1 |a| |ii|| | 1 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 1 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 1 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 1 |
| Front Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 1 |
| Rear Drive chain worn to excess |6.1.7 |c| |i|| | 1 |
| Rear reflector missing (4.8.2 (a) (ii)) | 1 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 1 |
| Rear Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 1 |
| Rear Brake disc|s| is excessively distorted |3.2.A1m| | 1 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 1 |
| Nearside Fuel pipe leaking excessively or a risk of fire (6.1.3 (b) (ii)) | 1 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Rear reflector on motorcycle incorrectly positioned |1.4.2d| | 1 |
| Offside Front Footrest insecure Circlip missing |6.2.1a| | 1 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 1 |
| Front Forks insecure pinch bolt missing (2.2.2 (d) (i)) | 1 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 1 |
| Front Plate brake test indicates a binding brake |3.3.B1a| | 1 |
| Front wheel spindle securing nut locking device insecure |2.3.5a| | 1 |
| Exhaust has part of the system missing |7.1.1a| | 1 |
| Rear Brake lagging in operation bled rear brake, air pocket in brake line. |1.2.1 |d|| | 1 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 1 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 1 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 1 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 1 |
| Front Brake lever insecure |3.1.2a| | 1 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 1 |
| Nearside Front Footrest insecure |6.2.1a| | 1 |
| Offside Front Footrest insecure |6.2.1a| | 1 |
| Headlamp light intensity severely reduced (4.1.4 (a)) | 1 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 1 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Horn not working |1.7.3a| | 1 |
| Drive chain so worn it is likely to fail |6.1.7 |c| |ii|| | 1 |
| Throttle operating incorrectly engine speed picking up in left lock (6.2.7 (a) (i)) | 1 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 1 |
| Rear Brake caliper|s| securing bolt|s| loose |3.2.A1j| | 1 |
| Rear Brake caliper|s| securing bolt|s| missing |3.2.A1j| | 1 |
| Inner Rear Lower Brake disc|s| excessively worn |3.2.A1l| | 1 |
| Drive chain worn to excess |6.2.1e| | 1 |
| Headlamp incorrect colour |1.2.1| | 1 |
| Nearside Rear Footrest insecure |6.2.1a| | 1 |
| Front Engine mounting/bracket missing (6.1.8 (a) (ii)) | 1 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 1 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 1 |
| Front Motorcycle structure corroded to the extent that the rigidity of the assembly is significantly reduced just above exhaust cross member on frame (6.1.1 (c) (i)) | 1 |
| Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |