| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 32 |
| Drive chain excessively loose |6.2.1d| | 18 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 16 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 10 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 10 |
| Horn not working |1.7.3a| | 9 |
| Drive chain worn to excess |6.2.1e| | 8 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 8 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 6 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Rear reflector on motorcycle missing |1.4.1| | 6 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 6 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 6 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 5 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 5 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Handlebar deformed |2.1.1b| | 4 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 4 |
| Headlamp insecure |1.2.3b| | 4 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 4 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Rear Brake locking device missing |3.2.A1e| | 3 |
| Nearside Rear Direction indicators not working |1.5.1c| | 3 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Rear reflector on motorcycle obscured |1.4.1| | 3 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| An item not tested |Manual| | 2 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 2 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 2 |
| Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Offside Rear Direction indicators not working |1.5.1c| | 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 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Horn not working (7.7 (a) (ii)) | 2 |
| Offside Front Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 2 |
| Direction indicator not working |1.5.1c| | 2 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 2 |
| Offside Front Direction indicator insecure |1.5.3b| | 2 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 2 |
| Front position lamp incorrect colour |1.1.2a| | 2 |
| Headlamp aim not tested |1.6| | 2 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 2 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 2 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Rear Drive chain worn to excess |6.2.1e| | 2 |
| Fuel system component leaking |7.2.1a| | 2 |
| Front Steering lock stop missing |2.1.3| | 2 |
| Nearside Front Direction indicators not working |1.5.1c| | 2 |
| Headlamp aim beam image kick up to the offside |1.6| | 2 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Rear position lamp insecure |1.1.1c| | 1 |
| Front Stop lamp damaged and function impaired |1.3.3a| | 1 |
| Nearside Position lamp switch insecure |1.1.4b| | 1 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 1 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 1 |
| Indicator switch insecure screw missing |1.5.4| | 1 |
| Front Position lamp not working (4.2.1 (a)) | 1 |
| Front Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 1 |
| Stop lamp not working control 2 (4.3.1 (a) (ii)) | 1 |
| Fuel system component leaking Fuel tap (6.1.3 (b) (i)) | 1 |
| Handlebar mounting clamp loose |2.1.1a| | 1 |
| Steering lock stop maladjusted |2.1.3| | 1 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 1 |
| Offside Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Headlamp aim does not move downwards when dipped |1.6.5| | 1 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 1 |
| Rear Drive chain excessively loose |6.2.1d| | 1 |
| Rear suspension has corrosion which reduces the strength of a load bearing member or its supporting structure. |2.4.A.2d| | 1 |
| Front Brake fluid reservoir leaking hydraulic fluid |3.2.B1e| | 1 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 1 |
| Brake locking device insecure |3.2.A1e| | 1 |
| Fuel cap mounting flange/sealing method defective |7.2.2c| | 1 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Horn is not a constant note |1.7.3c| | 1 |
| Front Brake master cylinder has an excessively worn master cylinder pivot. |3.2.B5| | 1 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 1 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 1 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride sprocket bolt missing |6.2.1h| | 1 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 1 |
| Nearside Front Indicator tell tale not functioning |1.5.2| | 1 |
| Rear Roller brake test indicates a severely juddering brake |3.3.A1b| | 1 |
| Rear Stop lamp damaged and function impaired |1.3.3a| | 1 |
| Nearside Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 1 |
| Offside Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 1 |
| Rear reflector on sidecar missing |1.4.1| | 1 |
| Brake performance not tested |3.3| | 1 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 1 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Rear reflector missing obscured by L plate |4.8.2 |a| |ii|| | 1 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 1 |
| Rear Shock absorber has a serious fluid leak both rear |5.3.2 |b|| | 1 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 1 |
| 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|| | 1 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 1 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Nearside Indicator tell tale not functioning |1.5.2| | 1 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 1 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Front shock absorber seal failed and leaking oil Both front forks |2.3.3| | 1 |
| Rear Rear reflector on motorcycle obscured |1.4.1| | 1 |
| Offside Rear Drive chain excessively loose |6.2.1d| | 1 |
| Centre Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 1 |
| Offside Rear Direction indicator not working |1.5.1c| | 1 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 1 |
| Fuel hose leaking |7.2.1a| | 1 |
| Offside Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 1 |
| Offside Rear Brake pedal has inadequate reserve travel |3.1.3b| | 1 |
| Brake pedal cannot be released smoothly |3.1.3d| | 1 |
| Clutch lever positioned so it cannot be readily operated. |6.2.1g| | 1 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 1 |
| Rear Brake drum|s| insecure |3.2.A1g| | 1 |
| Rear Brake reaction bracket securing bolt|s| missing |3.2.A1j| | 1 |
| Front Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 1 |
| Offside Indicator tell tale not functioning |1.5.2| | 1 |
| Rear Motorcycle structure excessively corroded |6.1.1a| | 1 |
| Offside Front Brake lever cannot be applied smoothly |3.1.3d| | 1 |
| Front Headlamp insecure |1.2.3b| | 1 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Front Headlamp missing |1.2.3a| | 1 |
| Front Brake component cracked and seriously reduced in strength |3.2.A1| | 1 |
| Steering headbearing has excessive free play |2.2.2| | 1 |
| Rear reflector missing (4.8.2 (a) (ii)) | 1 |
| Rear Position lamp light intensity significantly reduced (4.2.3 (a) (ii)) | 1 |
| Nearside Rear Direction indicator missing (4.4.1 (a) (ii)) | 1 |
| Offside Rear Direction indicator missing (4.4.1 (a) (ii)) | 1 |
| Registration plate lamp issues | 1 |
| Brake lever cannot be applied smoothly |3.1.3d| | 1 |
| Centre Rear Rear reflector on motorcycle missing |1.4.1| | 1 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 1 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 1 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 1 |
| Nearside Rear Drive chain worn to excess |6.2.1e| | 1 |
| Nearside Rear Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Offside Rear Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Nearside Rear Rear suspension component excessively corroded. |2.4.A.1a| | 1 |
| Offside Rear Rear suspension component excessively corroded. |2.4.A.1a| | 1 |
| Headlamp aim beam image kick-up is to the offside |1.6.1| | 1 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 1 |
| Nearside Rear Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 1 |
| Offside Front Direction indicators not working |1.5.1c| | 1 |
| Nearside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Nearside Footrest insecure |6.2.1a| | 1 |
| Nearside Front mudguard insecure |2.3.7| | 1 |
| Front Brake master cylinder leaking (1.1.10 (b) (ii)) | 1 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 1 |
| Front mudguard insecure |2.3.7| | 1 |
| Offside Rear Direction indicator insecure |1.5.3b| | 1 |
| Rear reflector on motorcycle obscured |1.4.2b| | 1 |
| Rear suspension component excessively corroded. |2.4.A.1a| | 1 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 1 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 1 |
| Rear reflector on motorcycle incorrectly positioned |1.4.2d| | 1 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 1 |
| Nearside Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 1 |
| Nearside Steering lock stop missing |2.1.3| | 1 |
| Offside Steering lock stop missing |2.1.3| | 1 |
| Steering movement excessively rough with the weight on the lower bearing |2.2.1a| | 1 |
| Rear Rear reflector on motorcycle incorrectly positioned |1.4.2d| | 1 |
| Front Front position lamp missing |1.1.1a| | 1 |
| Nearside Steering lock stop ineffective |2.1.3| | 1 |
| Horn control not functioning. |1.7.2b| | 1 |
| Nearside Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Offside Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Front Brake excessively binding (1.2.1 (f)) | 1 |
| Nearside Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Offside Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Shock absorber has a serious fluid leak both front forks (5.3.2 (b)) | 1 |
| Front Shock absorber has negligible damping effect (5.3.2 (b)) | 1 |
| Chain guard insecure |6.2.1c| | 1 |
| Drive chain excessively tight |6.2.1d| | 1 |
| Front Headlamp aim not tested |1.6| | 1 |
| Front Handlebar excessively deformed |2.2.1 |c| |i|| | 1 |
| Rear Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 1 |
| Horn control defective |1.7.2a| | 1 |
| Offside Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Nearside Rear Drive chain excessively tight |6.2.1d| | 1 |
| Offside Rear Footrest missing |6.2.1a| | 1 |
| Nearside Front Footrest insecure |6.2.1a| | 1 |
| Front Steering headbearing has excessive free play |2.2.2| | 1 |
| Front Brake hose stretched by suspension movement |3.2.B3b| | 1 |
| Front Wheel has an excessively eccentric bead rim. |4.2.2| | 1 |
| Rear suspension component loose |2.4.A.1a| | 1 |
| Offside Front suspension assembly component loose |2.3.1| | 1 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 1 |