| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 66 |
| Registration plate lamp issues | 35 |
| Rear reflector missing (4.8.2 (a) (ii)) | 21 |
| Rear reflector on motorcycle missing |1.4.1| | 19 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 16 |
| Registration plate issues | 16 |
| Drive chain excessively loose |6.2.1d| | 15 |
| Rear Brake excessively binding (1.2.1 (f)) | 14 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 13 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 12 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 12 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 11 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 8 |
| Horn not working |1.7.3a| | 7 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 7 |
| Drive chain worn to excess |6.2.1e| | 6 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 6 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 6 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 5 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 5 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 5 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 5 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 4 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 4 |
| Front Brake excessively binding (1.2.1 (f)) | 4 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Rear Brake excessively binding |1.2.1 |f|| | 4 |
| Horn not working (7.7 (a) (ii)) | 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 |
| Handlebar deformed |2.1.1b| | 4 |
| Rear mono-shock pivot seized |2.4.B.4| | 4 |
| Front Brake excessively binding |1.2.1 |f|| | 4 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 3 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Rear Brake hose excessively twisted (1.1.12 (b) (ii)) | 3 |
| Rear Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 3 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 3 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 3 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 3 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 3 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 3 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Stop lamp remains on when the brakes are released | 3 |
| Rear Drive chain worn to excess (6.1.7 (c) (i)) | 3 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 3 |
| Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Rear reflector missing |4.8.2 |a| |ii|| | 3 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 2 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 2 |
| Throttle operating incorrectly |6.2.7 |a| |i|| | 2 |
| Headlamp aim not tested (4.1.2 (b)) | 2 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Rear Brake caliper inadequately mounted (1.1.16 (c) (i)) | 2 |
| Nearside Front Brake excessively binding (1.2.1 (f)) | 2 |
| Offside Front Brake excessively binding (1.2.1 (f)) | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| Handlebar excessively deformed (2.2.1 (c) (i)) | 2 |
| Handlebar fouling on the fuel tank or bodywork on full lock (2.1.4 (b)) | 2 |
| Horn not working |7.7 |a| |ii|| | 2 |
| Handlebar mounting insecure (2.2.1 (a) (i)) | 2 |
| Front Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 2 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 2 |
| Nearside Front Position lamp not working (4.2.1 (a)) | 2 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Rear suspension component seized |2.4A2a|ii|| | 2 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 2 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 2 |
| Front Position lamp not working (4.2.1 (a)) | 2 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 2 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Central Front Lower Valve stem seriously damaged (5.2.3 (j)) | 2 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 2 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Front Brake disc|s| cracked |3.2.A1g| | 2 |
| Front Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Riders seat insecure |6.2.1a| | 2 |
| Rear Brake grabbing severely (1.2.1 (c)) | 2 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Rear Footrest missing (6.2.12 (a)) | 2 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Stop lamp adversely affected by the operation of another lamp |4.3.3 |b|| | 2 |
| 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|| | 2 |