| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 84 |
| Drive chain excessively loose |6.2.1d| | 57 |
| Drive chain worn to excess |6.2.1e| | 41 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 38 |
| Registration plate issues | 32 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 27 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 23 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 22 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 22 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 21 |
| Throttle operating incorrectly |6.2.1f| | 21 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 20 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 18 |
| Front wheel bearings are excessively rough |2.3.5b| | 17 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 16 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 16 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 16 |
| Drive chain excessively tight |6.2.1d| | 16 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 14 |
| Headlamp aim beam image kick up to the offside |1.6| | 13 |
| Horn not working |1.7.3a| | 12 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 12 |
| 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| | 12 |
| Front wheel bearings have excessive free play |2.3.5b| | 10 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 10 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 10 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 9 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 9 |
| Rear reflector on motorcycle missing |1.4.1| | 9 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 9 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 9 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 8 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 8 |
| Rear Drive chain excessively loose |6.2.1d| | 8 |
| Stop lamp remains on when the brakes are released | 8 |
| Rear reflector missing (4.8.2 (a) (ii)) | 8 |
| Rear Wheel spoke missing |4.2.1b| | 7 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 7 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 7 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 7 |
| Stop lamp remains on when the brake is released |1.3.1e| | 6 |
| Front Brake excessively binding (1.2.1 (f)) | 6 |
| Rear Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 6 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 5 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 5 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 5 |
| Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 5 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 5 |
| Rear Wheel spoke excessively loose |4.2.1b| | 5 |
| 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)) | 5 |
| Brake pedal cannot be released smoothly |3.1.3d| | 5 |
| Steering headbearing has excessive free play |2.2.2| | 5 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 5 |
| Exhaust excessively deteriorated |7.1.1a| | 5 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 5 |
| Handlebar deformed |2.1.1b| | 4 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 4 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 4 |
| Rear Wheel spoke excessively bent |4.2.1b| | 4 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 4 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 4 |
| Front Wheel spoke excessively loose |4.2.1b| | 4 |
| Offside Rear Direction indicator not working |1.5.1c| | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Horn not working (7.7 (a)) | 4 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Chain guard insecure |6.2.1c| | 3 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 3 |
| Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Nearside Rear Direction indicators not working |1.5.1c| | 3 |
| Rear position lamp insecure |1.1.1c| | 3 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 3 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 3 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 3 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 3 |
| Rear Wheel spoke cracked. |4.2.1b| | 3 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 3 |
| Rear Brake pedal not releasing correctly and functionality of brakes affected (1.1.2 (b) (ii)) | 3 |
| Brake lever cannot be applied smoothly |3.1.3d| | 3 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 3 |
| Offside Rear Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| 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|| | 3 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 3 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 3 |
| Rear Drive chain excessively tight |6.2.1d| | 2 |
| Front Headlamp not working on main beam |4.1.1 |a| |ii|| | 2 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 2 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 2 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 2 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front Throttle operating incorrectly |6.2.1f| | 2 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Nearside Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 2 |
| Rear Stop lamp does not emit a steady light |1.3.1b| | 2 |
| Offside Rear Direction indicators not working |1.5.1c| | 2 |
| Brake locking device missing |3.2.A1e| | 2 |
| Front Stop lamp does not illuminate immediately a brake applies (1.3.1a) | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 2 |
| Front Horn not working |1.7.3a| | 2 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Rear Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 2 |
| Registration plate lamp issues | 2 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Front Brake fluid contaminated (1.8 (a)) | 2 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 2 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 2 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 2 |
| Nearside Rear Direction indicator not working |1.5.1c| | 2 |
| Rear Brake pedal is inoperative |3.1.3c| | 2 |
| Rear Brake performance not tested |3.3| | 2 |
| Front Position lamp not working (4.2.1 (a)) | 2 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Offside Front Footrest insecure |6.2.1a| | 2 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 2 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 2 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 2 |
| Rear Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 2 |
| Front Headlamp aim beam image kick-up is to the offside |1.6.1| | 2 |
| Rear Drive chain worn to excess |6.2.1e| | 2 |
| Rear Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 2 |
| Front Brake hose fouling |3.2.B3b| | 2 |
| Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 2 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 2 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Front Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |