| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 113 |
| Rear reflector on motorcycle missing |1.4.1| | 72 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 51 |
| Drive chain excessively loose |6.2.1d| | 34 |
| Drive chain worn to excess |6.2.1e| | 33 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 29 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 21 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 21 |
| Registration plate issues | 20 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 19 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 19 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 16 |
| Rear reflector on motorcycle obscured |1.4.1| | 16 |
| Horn not working |1.7.3a| | 16 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 15 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 13 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 13 |
| Throttle operating incorrectly |6.2.1f| | 13 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 13 |
| Registration plate lamp issues | 13 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 12 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 11 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 9 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 9 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 8 |
| Handlebar deformed |2.1.1b| | 8 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 8 |
| Drive chain excessively tight |6.2.1d| | 8 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| Headlamp aim beam image kick up to the offside |1.6| | 7 |
| Nearside Rear Direction indicator not working |1.5.1c| | 7 |
| Rear Drive chain excessively loose |6.2.1d| | 7 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 7 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Front Brake excessively binding (1.2.1 (f)) | 7 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 6 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 6 |
| Offside Rear Direction indicators not working |1.5.1c| | 6 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 6 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 5 |
| Front Wheel spoke excessively loose |4.2.1b| | 5 |
| Rear reflector missing |4.8.2 |a| |ii|| | 5 |
| Steering headbearing has excessive free play |2.2.2| | 5 |
| Exhaust noise is clearly in excess of that emitted by a similar motor bicycle fitted with a standard silencer in average condition |7.1.2| | 5 |
| Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Headlamp insecure |1.2.3b| | 4 |
| Nearside Rear Footrest missing |6.2.1a| | 4 |
| Offside Rear Footrest missing |6.2.1a| | 4 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Offside Rear Direction indicator not working |1.5.1c| | 4 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Exhaust excessively deteriorated |7.1.1a| | 4 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 4 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 4 |
| Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Nearside Front Direction indicator not working |1.5.1c| | 3 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 3 |
| Rear Direction indicator not working |1.5.1c| | 3 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 3 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Nearside Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 3 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 3 |
| An item not tested |Manual| | 3 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 3 |
| Offside Front Direction indicator not working |1.5.1c| | 3 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 3 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Offside Rear Footrest insecure |6.2.1a| | 3 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 3 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 3 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 3 |
| Rear Wheel spoke missing |4.2.1b| | 3 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 3 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 3 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| All direction indicators not working (4.4.1 (a) (ii)) | 3 |
| Horn not working (7.7 (a)) | 3 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 2 |
| Nearside Direction indicator flashing more than 120 times per minute |1.5.1c| | 2 |
| Nearside Rear Direction indicators not working |1.5.1c| | 2 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 2 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 2 |
| Indicator switch insecure |1.5.4| | 2 |
| Rear Wheel bearing has excessive play |5.1.3 |a| |i|| | 2 |
| Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 2 |
| Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 2 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 2 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Central Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 2 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 2 |
| Rear Drive chain worn to excess |6.2.1e| | 2 |
| Front Plate brake test indicates a binding brake |3.3.B1a| | 2 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 2 |
| Riders seat insecure |6.2.1a| | 2 |
| Lower Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Stop lamp remains on when the brakes are released | 2 |
| Rear Exhaust excessively deteriorated |7.1.1a| | 2 |
| Front Brake master cylinder leaking hydraulic fluid |3.2.B1e| | 2 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 2 |
| Offside Rear Direction indicator insecure |1.5.3b| | 2 |
| Rear wheel spindle securing nut|s| loose |2.4.A.2b| | 2 |
| Rear wheel has a loose wheel nut|s| |4.2.3a| | 2 |
| Brake master cylinder insecure lever pivot snapped |1.1.10 |c|| | 2 |
| Headlamp aim so that beam "kick up" is not visible on the screen |4.1.2 |a|| | 2 |
| Rear Wheel spoke cracked. |4.2.1b| | 2 |
| Front Steering headbearing has excessive free play |2.2.2| | 2 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Horn control not functioning. |1.7.2b| | 2 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 2 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 2 |
| Rear Brake excessively binding (1.2.1 (f)) | 2 |
| Exhaust system insecure (6.1.2 (a)) | 2 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 2 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 2 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 2 |
| Riders seat insecure (6.2.5 (a) (ii)) | 2 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Rear Position lamp not working (4.2.1 (a)) | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 2 |
| Front Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 2 |
| Front Position lamp not working (4.2.1 (a)) | 2 |