| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 75 |
| Rear reflector on motorcycle missing |1.4.1| | 45 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 31 |
| Drive chain excessively loose |6.2.1d| | 26 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 26 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 23 |
| Front wheel bearings have excessive free play |2.3.5b| | 23 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 20 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 19 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 19 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 19 |
| Horn not working |1.7.3a| | 18 |
| Front wheel bearings are excessively rough |2.3.5b| | 18 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 17 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 16 |
| Registration plate issues | 15 |
| Drive chain excessively tight |6.2.1d| | 14 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 13 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 12 |
| Steering headbearing has excessive free play |2.2.2| | 12 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 12 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 11 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 11 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 10 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 9 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 8 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 7 |
| Throttle operating incorrectly |6.2.1f| | 7 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 7 |
| Drive chain worn to excess |6.2.1e| | 7 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 6 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 6 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 6 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 6 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 6 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 6 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 6 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 6 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 6 |
| Nearside Front Direction indicator not working |1.5.1c| | 6 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 6 |
| Headlamp aim beam image kick up to the offside |1.6| | 5 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 5 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 5 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 5 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 4 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 4 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 4 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 4 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 4 |
| Front suspension has inadequate damping effect. |2.3.6c| | 4 |
| Nearside Steering lock stop ineffective |2.1.3| | 4 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 4 |
| Front Steering headbearing has excessive free play |2.2.2| | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 4 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Offside Rear Lower Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Rear Hydraulic brake control feels spongy |3.1.4a| | 3 |
| Headlamp insecure |1.2.3b| | 3 |
| Offside Rear Footrest insecure |6.2.1a| | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 3 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Exhaust excessively deteriorated |7.1.1a| | 3 |
| Nearside Front Direction indicator not working |4.4.1 |a| |ii|| | 3 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 3 |
| Rear Drive chain excessively loose |6.2.1d| | 3 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Rear Drive chain worn to excess |6.2.1e| | 3 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 3 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Centre Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Offside Front Direction indicator not working |1.5.1c| | 3 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 3 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 3 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Front Position lamp not working (4.2.1 (a)) | 3 |
| Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 2 |
| Offside Front Lower Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Handlebar deformed |2.1.1b| | 2 |
| Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 2 |
| Rear Direction indicator flashing more than 120 times per minute |1.5.1c| | 2 |
| Rear Hydraulic brake control creeps under load. |3.1.4a| | 2 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 2 |
| Rear Brake locking device missing |3.2.A1e| | 2 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 2 |
| Front Horn not working |1.7.3a| | 2 |
| Rear Brake has no recorded effort at a wheel |1.2.1 |a| |ii|| | 2 |
| Riders seat insecure |6.2.1a| | 2 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 2 |
| Fairing so located that it is likely to impede the steering |2.1.2e| | 2 |
| Nearside Front Lower Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Nearside Direction indicators not working |1.5.1c| | 2 |
| Rear Plate brake test indicates a binding brake |3.3.B1a| | 2 |
| Rear suspension has corrosion which reduces the strength of a load bearing member or its supporting structure. |2.4.A.2d| | 2 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Nearside Front Footrest insecure |6.2.1a| | 2 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Plate brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.B2b| | 2 |
| Direction indicators not working |1.5.1c| | 2 |
| Rear Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 2 |
| Rear Footrest missing |6.2.1a| | 2 |
| Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 2 |
| Front Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 2 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 2 |
| Registration plate lamp issues | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Offside Front Footrest insecure |6.2.1a| | 2 |
| Rear Brake master cylinder insecurely mounted |3.2.B1a| | 2 |
| Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 2 |
| Centre Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Chain guard insecure |6.2.1c| | 2 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 2 |
| Rear Brake disc|s| excessively pitted |3.2.A1l| | 2 |
| Front Brake fluid reservoir leaking hydraulic fluid |3.2.B1e| | 2 |
| Rear position lamp missing |1.1.1a| | 2 |
| Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Fuel system component leaking |7.2.1a| | 2 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Rear Brake excessively binding (1.2.1 (f)) | 2 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 2 |