| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 109 |
| Registration plate lamp issues | 84 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 60 |
| Front Brake excessively binding (1.2.1 (f)) | 29 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 25 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 18 |
| Rear Brake excessively binding (1.2.1 (f)) | 18 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 17 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 13 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 12 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 10 |
| Registration plate issues | 10 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 9 |
| Stop lamp not working (4.3.1 (a) (ii)) | 8 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 8 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 7 |
| Horn not working (7.7 (a)) | 7 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 7 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 7 |
| Stop lamp remains on when the brakes are released | 6 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 6 |
| Rear Drive chain worn to excess (6.1.7 (c) (i)) | 5 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 5 |
| Headlamp insecure (4.1.1 (c)) | 5 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 5 |
| Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 5 |
| Rear Position lamp not working (4.2.1 (a)) | 5 |
| Front Position lamp not working (4.2.1 (a)) | 5 |
| Handlebar deformed to the extent that steering is affected (2.2.1 (c) (ii)) | 4 |
| Handlebar excessively deformed (2.2.1 (c) (i)) | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Rear Brake has no recorded effort at a wheel (1.2.1 (a) (ii)) | 4 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 4 |
| Rear Brake pedal not releasing correctly and functionality of brakes affected (1.1.2 (b) (ii)) | 4 |
| Rear Brake grabbing severely (1.2.1 (c)) | 4 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 3 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Brake pedal has insufficient reserve travel (1.1.2 (a)) | 3 |
| Rear Drive chain excessively loose (6.1.7 (c) (i)) | 3 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Rear Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 3 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 3 |
| Rear Brake lining(s) less than 1.0 mm thick (1.1.13 (a)) | 3 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Drive chain sprocket so worn it is likely to fail (6.1.7 (c) (ii)) | 3 |
| Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 2 |
| Fork yoke in such a condition that steering control is adversely affected (2.2.2 (d) (ii)) | 2 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 2 |
| Horn not working (7.7 (a) (ii)) | 2 |
| Drive chain horseshoe locking device likely to become detached (6.1.7 (j) (ii)) | 2 |
| Steering operation fouling on the fuel tank or bodywork on full lock (2.1.4 (b)) | 2 |
| Rear Brake linkage has abnormal movement of levers indicating excessive wear or maladjustment (1.1.15 (f)) | 2 |
| Rear Wheel spindle loose (5.2.1 (c) (i)) | 2 |
| Nearside Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 2 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Drive chain sprocket excessively loose (6.1.7 (c) (i)) | 2 |
| Rear Brake rod insecure (1.1.15 (c)) | 2 |
| Handlebar so insecure it is likely to become detached (2.2.1 (b) (ii)) | 2 |
| Nearside Rear Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 2 |
| Front Brake grabbing severely (1.2.1 (c)) | 2 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Rear Brake component inadequately mounted (1.1.21 (c)) | 2 |
| Chain guard insecure (6.1.7 (i)) | 2 |
| Front Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 2 |
| Front Brake lever is bent and the brake cannot be readily applied (1.1.2 (d)) | 2 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 2 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 2 |
| Front Dipswitch does not operate immediately when selected on dipped beam (4.1.3 (b)) | 2 |
| Nearside Rear Drive chain excessively loose (6.1.7 (c) (i)) | 2 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Riders seat insecure (6.2.5 (a) (ii)) | 2 |
| Headlamp aim unable to be tested (4.1.2 (b)) | 2 |
| Position lamp not working (4.2.1 (a)) | 2 |
| Handlebar fouling on the fuel tank or bodywork on full lock (2.1.4 (b)) | 2 |
| Rear Wheel bearing rough when rotated (5.1.3 (b) (i)) | 2 |
| Central Front Brake lagging in operation (1.2.1 (d)) | 2 |