| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 171 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 149 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 76 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 49 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 47 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 40 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 36 |
| Registration plate lamp issues | 35 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 33 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 33 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 31 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 31 |
| Rear Position lamp not working (4.2.1 (a)) | 23 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 19 |
| Front Brake disc contaminated (1.1.14 (b)) | 18 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 16 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 15 |
| Handlebar excessively deformed (2.2.1 (c) (i)) | 15 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 15 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 14 |
| Stop lamp not working (4.3.1 (a) (ii)) | 14 |
| Rear Drive chain excessively loose (6.1.7 (c) (i)) | 13 |
| Front Brake lever is so short that the brake cannot be readily applied (1.1.2 (d)) | 13 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 13 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 13 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 13 |
| Handlebar deformed to the extent that steering is affected (2.2.1 (c) (ii)) | 12 |
| Rear Brake excessively binding (1.2.1 (f)) | 12 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 11 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 11 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 11 |
| Front Brake excessively binding (1.2.1 (f)) | 10 |
| Horn not working (7.7 (a)) | 10 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 10 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 10 |
| Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 10 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 10 |
| Stop lamp remains on when the brakes are released | 10 |
| Registration plate issues | 9 |
| Front Brake grabbing severely (1.2.1 (c)) | 9 |
| Front Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 7 |
| Front Brake fluid contaminated (1.8 (a)) | 7 |
| Front Shock absorber has negligible damping effect (5.3.2 (b)) | 7 |
| Headlamp aim unable to be tested (4.1.2 (b)) | 6 |
| Rear Brake lining(s) less than 1.0 mm thick (1.1.13 (a)) | 6 |
| Rear reflector missing (4.8.2 (a) (ii)) | 6 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 6 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 6 |
| Nearside Rear Drive chain excessively loose (6.1.7 (c) (i)) | 6 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 6 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 5 |
| Offside Front Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 5 |
| Handlebar fouling on the fuel tank or bodywork on full lock (2.1.4 (b)) | 5 |
| Nearside Front Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 5 |
| Rear Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 5 |
| Throttle control functioning such that safe operation of the motorcycle is adversely affected (6.2.7 (a) (ii)) | 5 |
| Rear Drive chain worn to excess (6.1.7 (c) (i)) | 5 |
| Front Handlebar deformed to the extent that steering is affected (2.2.1 (c) (ii)) | 5 |
| Front Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 5 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Front Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 5 |
| Clutch lever bent so it cannot be readily operated (6.2.7 (b)) | 4 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Headlamp insecure (4.1.1 (c)) | 4 |
| Steering operation fouling on the fuel tank or bodywork on full lock (2.1.4 (b)) | 4 |
| Front Brake fluid reservoir fluid level significantly below minimum level (1.1.10 (d) (ii)) | 4 |
| Rear Drive chain sprocket so worn it is likely to fail (6.1.7 (c) (ii)) | 4 |
| Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 4 |
| Rear Brake effort inadequate at a wheel (1.2.1 (a) (i)) | 4 |
| Front Position lamp not working (4.2.1 (a)) | 4 |
| Offside Front Direction indicator likely to become detached (4.4.1 (c) (ii)) | 4 |
| Drive chain sprocket so worn it is likely to fail (6.1.7 (c) (ii)) | 4 |