| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 36 |
| Drive chain excessively loose |6.2.1d| | 20 |
| Rear reflector on motorcycle missing |1.4.1| | 19 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 13 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 11 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 9 |
| Rear reflector on motorcycle obscured |1.4.1| | 6 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 6 |
| Registration plate issues | 5 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 4 |
| Drive chain worn to excess |6.2.1e| | 4 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 4 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 3 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Horn not working |1.7.3a| | 3 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 3 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 2 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 2 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 2 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Exhaust excessively deteriorated |7.1.1a| | 2 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 2 |
| Steering headbearing has excessive free play |2.2.2| | 2 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 2 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 2 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Offside Rear Direction indicator insecure |1.5.3b| | 2 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 2 |
| Offside Front Direction indicators not working |1.5.1c| | 2 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 2 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 2 |
| Front Steering headbearing has excessive free play |2.2.2| | 1 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Offside Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Handlebar mounting clamp bolt loose handle bar mounting loose |2.1.1a| | 1 |
| Front Brake disc|s| cracked |3.2.A1g| | 1 |
| Rear Brake locking device missing |3.2.A1e| | 1 |
| Brake master cylinder fluid level dangerously low |3.2.B1d| | 1 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride rear brake arm split pin missing |6.2.1h| | 1 |
| Rear wheel rotation likely to be impeded |6.2.1b| | 1 |
| Rear reflector on motorcycle insecure |1.4.2c| | 1 |
| Horn not working |7.7 |a| |ii|| | 1 |
| Front Direction indicators not working |1.5.1c| | 1 |
| Rear Direction indicators not working |1.5.1c| | 1 |
| Front Horn not working |1.7.3a| | 1 |
| Riders seat insecure |6.2.5 |a| |ii|| | 1 |
| Stop lamp deteriorated and function impaired |1.3.3a| | 1 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 1 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 1 |
| Front Gradient brake test indicates a binding brake |3.3.D1c| | 1 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 1 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 1 |
| Direction indicators not working Not flashing |1.5.1c| | 1 |
| Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 1 |
| Clutch lever shortened so it cannot be readily operated. |6.2.1g| | 1 |
| Rear Brake linkage has abnormal movement due to excessive wear Pivot |3.2.A1i| | 1 |
| Nearside Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Rear reflector on motorcycle obscured |1.4.2b| | 1 |
| Handlebar deformed |2.1.1b| | 1 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 1 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 1 |
| Brake lever has inadequate reserve travel |3.1.3b| | 1 |
| Throttle operating incorrectly |6.2.1f| | 1 |
| Steering headbearing in such a condition that steering control is adversely affected |2.2.2 |f| |ii|| | 1 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Rear Drive chain worn to excess |6.2.1e| | 1 |
| Front Stop lamp does not emit a steady light |1.3.1b| | 1 |
| Rear All position lamps do not illuminate immediately when switched on |1.1.3a| | 1 |
| Nearside Footrest insecure |6.2.1a| | 1 |
| Rear Lower Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 1 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 1 |
| Front Brake cylinder leaking hydraulic fluid Caliper piston leaking fluid onto pads & brake disc. |3.2.B1e| | 1 |
| Rear Stop lamp does not illuminate immediately a brake applies Rear brake pedal has fault. |1.3.1a| | 1 |
| Offside Handlebar deformed |2.1.1b| | 1 |
| Rear reflector missing |4.8.2 |a| |ii|| | 1 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 1 |
| Front Floor brake test indicates a severely grabbing brake |3.3.C2d| | 1 |
| Rear Drive chain excessively tight |6.2.1d| | 1 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 1 |
| Offside Rear Direction indicator incorrect colour |4.4.3 |a|| | 1 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 1 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Rear Brake excessively binding |1.2.1 |f|| | 1 |
| Rear Brake performance not tested |1.2.1 |g|| | 1 |
| Rear reflector missing behind l plate |4.8.2 |a| |ii|| | 1 |
| Stop lamp not working front brake |4.3.1 |a| |ii|| | 1 |
| Stop lamp does not illuminate immediately a brake applies front brake |1.3.1a| | 1 |
| Centre Rear reflector on motorcycle obscured |1.4.1| | 1 |
| Front wheel bearings have excessive free play |2.3.5b| | 1 |
| Headlamp aim beam image kick up to the offside |1.6| | 1 |
| Front Brake disc|s| is excessively distorted |3.2.A1m| | 1 |
| Lower Exhaust excessively deteriorated |7.1.1a| | 1 |
| Stop lamp does not illuminate immediately a brake applies rear brake applied |1.3.1a| | 1 |
| Lower Brake locking device missing |3.2.A1e| | 1 |
| Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 1 |
| Brake fluid reservoir severely damaged |3.2.B1b| | 1 |
| Nearside Front Direction indicator insecure |1.5.3b| | 1 |
| Front Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 1 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Front Roller brake test indicates a severely juddering brake |3.3.A1b| | 1 |
| Front Brake component leaking fluid |3.2.B4| | 1 |
| Nearside Drive chain excessively loose |6.2.1d| | 1 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 1 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 1 |
| Front Brake excessively binding |1.2.1 |f|| | 1 |
| Headlamp light source and lamp not compatible (4.1.4 (c)) | 1 |
| Rear Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 1 |
| Horn not working (7.7 (a) (ii)) | 1 |
| Stop lamp switch with a delay in operation from rear brake operation, light does not illuminate unless pedal is pressed all the way down. (4.3.2 (a) (ii)) | 1 |
| Brake excessively binding rear brake cam does not release correctly, causing brake to bind (1.2.1 (f)) | 1 |
| Drive chain horseshoe locking device incorrectly fitted clip fitted backwards for travel of direction for chain (6.1.7 (j) (i)) | 1 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 1 |
| Brake component inadequately mounted Split pin was missing (1.1.21 (c)) | 1 |
| Front Brake pivot has restricted free movement (1.1.15 (e)) | 1 |
| Direction indicator not working battery us . (4.4.1 (a) (ii)) | 1 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 1 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 1 |
| Rear Wheel bearing so rough it is likely to overheat or break up (5.1.3 (b) (ii)) | 1 |
| Nearside Front Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 1 |
| Front Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 1 |
| Stop lamp not working (4.3.1 (a) (ii)) | 1 |