| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 107 |
| Rear reflector on motorcycle missing |1.4.1| | 100 |
| Drive chain excessively loose |6.2.1d| | 69 |
| Registration plate issues | 36 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 36 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 35 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 34 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 33 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 32 |
| Drive chain worn to excess |6.2.1e| | 31 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 29 |
| Steering headbearing has excessive free play |2.2.2| | 28 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 25 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Nearside Rear Footrest missing |6.2.1a| | 21 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 21 |
| Offside Rear Footrest missing |6.2.1a| | 19 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 19 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 19 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 17 |
| Throttle operating incorrectly |6.2.1f| | 16 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 16 |
| Horn not working |1.7.3a| | 15 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 15 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 14 |
| Nearside Front Direction indicator not working |1.5.1c| | 14 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 13 |
| Fuel system component insecure |7.2.1b| | 13 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 13 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 12 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 12 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 12 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 12 |
| Drive chain excessively tight |6.2.1d| | 11 |
| Nearside Rear Direction indicator not working |1.5.1c| | 11 |
| Rear Footrest missing |6.2.1a| | 11 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 10 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 10 |
| Rear Drive chain excessively loose |6.2.1d| | 10 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 9 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 8 |
| Headlamp switch faulty |1.2.4| | 8 |
| Offside Front Direction indicator not working |1.5.1c| | 8 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 8 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 8 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 7 |
| Rear position lamp insecure |1.1.1c| | 7 |
| Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 7 |
| Offside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 7 |
| Offside Steering lock stop ineffective |2.1.3| | 7 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 7 |
| Rear Direction indicator not working |1.5.1c| | 7 |
| Nearside Rear Direction indicators not working |1.5.1c| | 7 |
| Front Direction indicators not working |1.5.1c| | 7 |
| Rear reflector missing (4.8.2 (a) (ii)) | 7 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 6 |
| Direction indicator not working |1.5.1c| | 6 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 6 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 6 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Front Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 6 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 6 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 6 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 6 |
| 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| | 6 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 6 |
| Headlamp insecure |1.2.3b| | 6 |
| Direction indicators not working |1.5.1c| | 6 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 6 |
| Stop lamp remains on when the brake is released |1.3.1e| | 6 |
| Offside Rear Direction indicator not working |1.5.1c| | 5 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 5 |
| Offside Front Direction indicator damaged and function impaired |1.5.3a| | 5 |
| Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Offside Rear Direction indicators not working |1.5.1c| | 5 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 5 |
| Exhaust mounting missing |7.1.1c| | 5 |
| Offside Direction indicator not working |1.5.1c| | 5 |
| Offside Front Direction indicator missing |1.5.1a| | 5 |
| Nearside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Front Steering headbearing has excessive free play |2.2.2| | 5 |
| Nearside Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 5 |
| Rear reflector missing |4.8.2 |a| |ii|| | 5 |
| Brake lever cannot be applied smoothly |3.1.3d| | 5 |
| Offside Front Direction indicators not working |1.5.1c| | 5 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 5 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 5 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 5 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 5 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 4 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Rear Drive chain excessively tight |6.2.1d| | 4 |
| Headlamp aim not tested |1.6| | 4 |
| Rear Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Nearside Direction indicator not working |1.5.1c| | 4 |
| Nearside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 4 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 4 |
| Offside Front Direction indicator insecure |1.5.3b| | 4 |
| Offside Handlebar deformed |2.1.1b| | 4 |
| Nearside Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 4 |
| Offside Front Footrest insecure |6.2.1a| | 4 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 4 |
| An item not tested |Manual| | 4 |
| Fuel system component leaking |7.2.1a| | 4 |
| Riders seat insecure |6.2.1a| | 4 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 4 |
| Rear Drive chain worn to excess |6.2.1e| | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Front Direction indicator not working |1.5.1c| | 4 |
| Rear Direction indicators not working |1.5.1c| | 4 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 4 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 4 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 4 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 4 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 4 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 3 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 3 |
| Indicator tell tale not functioning |1.5.2| | 3 |
| Fuel pipe leaking |7.2.1a| | 3 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 3 |
| Offside Front Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 3 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Offside Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Headlamp incorrect colour |1.2.1| | 3 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 3 |
| Front position lamp incorrect colour |1.1.2a| | 3 |
| Front wheel bearings are excessively rough |2.3.5b| | 3 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Nearside Front Direction indicator missing |1.5.1a| | 3 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 3 |
| Front Brake caliper|s| insecure |3.2.A1j| | 3 |
| Front position lamp damaged and function impaired |1.1.1b| | 3 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 3 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 3 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 3 |
| Rear mono-shock pivot seized |2.4.B.4| | 3 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |
| Offside Rear Footrest missing (6.2.12 (a)) | 3 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 3 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 3 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 3 |