| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 61 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 34 |
| Drive chain excessively loose |6.2.1d| | 29 |
| Drive chain worn to excess |6.2.1e| | 21 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 19 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 17 |
| Registration plate issues | 16 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 13 |
| Stop lamp remains on when the brakes are released | 13 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 12 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 12 |
| Front wheel bearings have excessive free play |2.3.5b| | 11 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 11 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 11 |
| Stop lamp remains on when the brake is released |1.3.1e| | 10 |
| Handlebar deformed |2.1.1b| | 10 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 10 |
| Front wheel bearings are excessively rough |2.3.5b| | 8 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 7 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 7 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 7 |
| Horn not working |1.7.3a| | 7 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 6 |
| Rear Drive chain excessively loose |6.2.1d| | 6 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 6 |
| Drive chain excessively tight |6.2.1d| | 6 |
| Offside Rear Direction indicator not working |1.5.1c| | 6 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 4 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Rear Wheel spoke excessively loose |4.2.1b| | 4 |
| Rear reflector on motorcycle missing |1.4.1| | 4 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Front Brake excessively binding (1.2.1 (f)) | 4 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 4 |
| Rear Brake pedal is positioned so that the brake cannot be readily applied |3.1.3c| | 4 |
| Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Rear Position lamp not working (4.2.1 (a)) | 3 |
| Nearside Rear Direction indicators not working |1.5.1c| | 3 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 3 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 3 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Rear Wheel spoke missing |4.2.1b| | 3 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 3 |
| Rear Drive chain excessively tight |6.2.1d| | 3 |
| Throttle operating incorrectly |6.2.1f| | 3 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Offside Rear Direction indicators not working |1.5.1c| | 2 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Nearside Front Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Offside Front Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 2 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 2 |
| Brake locking device missing |3.2.A1e| | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Nearside Rear Direction indicator not working |1.5.1c| | 2 |
| Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 2 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 2 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 2 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 2 |
| Horn control defective |1.7.2a| | 2 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Headlamp insecure (4.1.1 (c)) | 2 |
| Brake pedal is positioned so that the brake cannot be readily applied |3.1.3c| | 2 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 2 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 2 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 2 |
| Rear Footrest missing |6.2.1a| | 2 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 2 |
| Rear Drive chain worn to excess |6.2.1e| | 2 |
| Front Handlebar deformed |2.1.1b| | 2 |
| Rear Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Drive chain horseshoe locking device incorrectly fitted |6.1.7 |j| |i|| | 2 |
| Rear Brake cable has restricted free movement |1.1.15 |e|| | 2 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 2 |
| Brake pedal has insufficient reserve travel (1.1.2 (a)) | 2 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 2 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Front Shock absorber has negligible damping effect (5.3.2 (b)) | 2 |
| Offside Rear Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 2 |