| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 195 |
| Drive chain excessively loose |6.2.1d| | 124 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 113 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 63 |
| Registration plate issues | 63 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 50 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 47 |
| Drive chain worn to excess |6.2.1e| | 47 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 41 |
| Steering headbearing has excessive free play |2.2.2| | 37 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 35 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 31 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 29 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 28 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 28 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 27 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 26 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 23 |
| Drive chain excessively tight |6.2.1d| | 23 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 22 |
| Front Brake excessively binding (1.2.1 (f)) | 21 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 21 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 20 |
| Registration plate lamp issues | 19 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 18 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 17 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 16 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 16 |
| Offside Handlebar deformed |2.1.1b| | 16 |
| Headlamp insecure |1.2.3b| | 16 |
| Riders seat insecure |6.2.1a| | 16 |
| Offside Front Direction indicator insecure |1.5.3b| | 15 |
| Horn not working |1.7.3a| | 15 |
| Front wheel bearings have excessive free play |2.3.5b| | 14 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 13 |
| Rear Brake excessively binding (1.2.1 (f)) | 13 |
| 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| | 13 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 13 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 12 |
| Nearside Front Direction indicator not working |1.5.1c| | 12 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 11 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 11 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 11 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Offside Front Direction indicator not working |1.5.1c| | 10 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Nearside Handlebar deformed |2.1.1b| | 10 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 10 |
| Nearside Front Direction indicators not working |1.5.1c| | 10 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 10 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 10 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 9 |
| Offside Front Direction indicators not working |1.5.1c| | 9 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 9 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 9 |
| Headlamp aim not tested (4.1.2 (b)) | 8 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 8 |
| Rear Brake excessively binding |1.2.1 |f|| | 8 |
| Nearside Front Direction indicator insecure |1.5.3b| | 8 |
| Rear Drive chain excessively loose |6.2.1d| | 8 |
| Nearside Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Offside Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Stop lamp remains on when the brake is released |1.3.1e| | 8 |
| Front Brake excessively binding |1.2.1 |f|| | 8 |
| Dipswitch does not extinquish main beam/s, leaving at least 1 dipped beam headlamp |1.2.2b|i|| | 7 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 7 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 7 |
| Nearside Rear Direction indicators not working |1.5.1c| | 7 |
| Nearside Rear Direction indicator not working |1.5.1c| | 7 |
| Rear reflector on motorcycle missing |1.4.1| | 7 |
| Brake lever cannot be applied smoothly |3.1.3d| | 6 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 6 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 6 |
| Riders seat insecure |6.2.5 |a| |ii|| | 6 |
| Front Brake grabbing severely (1.2.1 (c)) | 6 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 6 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 6 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 6 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 6 |
| Offside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 6 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 6 |
| Rear reflector missing (4.8.2 (a) (ii)) | 6 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 6 |
| Headlamp insecure (4.1.1 (c)) | 6 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 6 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 5 |
| Front Direction indicators not working |1.5.1c| | 5 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 5 |
| Offside Rear Direction indicator not working |1.5.1c| | 5 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 5 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 5 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 5 |
| Nearside Front Footrest insecure |6.2.1a| | 5 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 5 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Offside Rear Footrest missing |6.2.1a| | 5 |
| Front Brake disc|s| is excessively distorted |3.2.A1m| | 5 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 5 |
| Nearside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 5 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 5 |
| Nearside Rear Footrest missing |6.2.1a| | 5 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 5 |
| Offside Front Footrest insecure |6.2.1a| | 5 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 5 |
| Front position lamp incorrect colour |1.1.2a| | 5 |
| Front Valve stem seriously damaged |5.2.3 |j|| | 5 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 4 |
| Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 4 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 4 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 4 |
| Rear Footrest missing |6.2.1a| | 4 |
| Nearside Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 4 |
| Rear Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 4 |
| Offside Handlebar excessively deformed (2.2.1 (c) (i)) | 4 |
| Throttle operating incorrectly |6.2.7 |a| |i|| | 4 |
| Horn not working (7.7 (a)) | 4 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 4 |
| Rear Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Headlamp aim beam image kick up to the offside |1.6| | 4 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 4 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 4 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 4 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 4 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Headlamp aim not tested |1.6| | 4 |
| Clutch lever positioned so it cannot be readily operated. |6.2.1g| | 4 |
| Rear Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 4 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 4 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 4 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 4 |
| Offside Front Handlebar deformed |2.1.1b| | 4 |
| 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|| | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |