| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 32 |
| Drive chain excessively loose |6.2.1d| | 23 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 17 |
| Registration plate issues | 12 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 11 |
| Drive chain worn to excess |6.2.1e| | 11 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 7 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 6 |
| Steering headbearing has excessive free play |2.2.2| | 6 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 6 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 6 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 6 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 5 |
| Headlamp insecure |1.2.3b| | 5 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 5 |
| Horn not working |1.7.3a| | 5 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 5 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 5 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Offside Rear Footrest missing |6.2.1a| | 4 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Handlebar deformed |2.1.1b| | 3 |
| Front wheel bearings are excessively rough |2.3.5b| | 3 |
| Rear Footrest missing |6.2.1a| | 3 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 3 |
| Throttle operating incorrectly |6.2.1f| | 3 |
| Nearside Rear Footrest missing |6.2.1a| | 3 |
| Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 2 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 2 |
| Front Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 2 |
| Brake locking device missing |3.2.A1e| | 2 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Nearside Front Direction indicators not working |1.5.1c| | 2 |
| Rear Wheel spoke excessively loose |4.2.1b| | 2 |
| Front Brake excessively binding |1.2.1 |f|| | 2 |
| Offside Rear Direction indicators not working |1.5.1c| | 2 |
| Rear Drive chain excessively loose (6.1.7 (c) (i)) | 2 |
| Rear Position lamp not working (4.2.1 (a)) | 2 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 2 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 2 |
| Rear Motorcycle structure excessively corroded |6.1.1a| | 2 |
| Rear Position lamp not working |4.2.1 |a|| | 2 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 2 |
| Rear reflector on motorcycle missing |1.4.1| | 2 |
| Rear Drive chain worn to excess |6.2.1e| | 2 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 2 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Offside Front Direction indicators not working |1.5.1c| | 2 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 1 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 1 |
| Headlamp switch faulty |1.2.4| | 1 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 1 |
| All direction indicators adversely affected by the operation of another lamp indicators cause headlight and tail light to flash (dim) (4.4.3 (b)) | 1 |
| Headlamp aim projected beam image obviously incorrect beam pattern upside down (4.1.2 (c)) | 1 |
| Nearside Shock absorber has a serious fluid leak fork oil noticeable on fork leg from fork gaiter (5.3.2 (b)) | 1 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 1 |
| Rear Rear wheel rotation likely to be impeded |6.2.1b| | 1 |
| Rear Wheel spoke cracked. |4.2.1b| | 1 |
| Rear suspension has corrosion which reduces the strength of a load bearing member or its supporting structure. |2.4.A.2d| | 1 |
| Front wheel insecure |4.2.3b| | 1 |
| Rear Drive chain sprocket carrier worn to excess cush drive |6.2.1e| | 1 |
| Headlamp missing fitted incorrect |1.2.3a| | 1 |
| Rear suspension component excessively corroded. |2.4.A.1a| | 1 |
| Dipswitch does not deflect the main beam/s, making them into dipped beam/s |1.2.2b|ii|| | 1 |
| Central Exhaust system insecure exhaust lower bracket bolt missing (6.1.2 (a)) | 1 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 1 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 1 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 1 |
| Centre Front Horn not working |1.7.3a| | 1 |
| Headlamp insecure |4.1.1 |c|| | 1 |
| Fuel system component leaking |6.1.3 |b| |i|| | 1 |
| All direction indicators not working |4.4.1 |a| |ii|| | 1 |
| Nearside Rear Rear shock absorber insecurely mounted |2.4.A.3b| | 1 |
| Offside Rear Rear shock absorber insecurely mounted |2.4.A.3b| | 1 |
| Dipswitch does not operate immediately when selected on dipped beam |4.1.3 |b|| | 1 |
| Dipswitch does not operate immediately when selected on main beam |4.1.3 |b|| | 1 |
| Offside Rear Footrest missing (6.2.12 (a)) | 1 |
| Offside Front Direction indicator insecure |1.5.3b| | 1 |
| Exhaust excessively deteriorated |7.1.1a| | 1 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 1 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 1 |
| Front Fuel system component insecure |7.2.1b| | 1 |
| Front Brake master cylinder fluid level dangerously low |3.2.B1d| | 1 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Front Wheel bearing so rough it is likely to overheat or break up (5.1.3 (b) (ii)) | 1 |
| Front Position lamp not working (4.2.1 (a)) | 1 |
| Steering headbearing in such a condition that steering control is adversely affected |2.2.2 |f| |ii|| | 1 |
| Front Headlamp aim so that beam "kick up" is not visible on the screen |4.1.2 |a|| | 1 |
| Front Headlamp not working on main beam |4.1.1 |a| |ii|| | 1 |
| Fuel system component leaking excessively or a risk of fire bottom of carb |6.1.3 |b| |ii|| | 1 |
| Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 1 |
| Rear Direction indicator flashing more than 120 times per minute |1.5.1c| | 1 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 1 |
| Front Brake master cylinder leaking hydraulic fluid |3.2.B1e| | 1 |
| Brake performance not tested |3.3| | 1 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 1 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 1 |
| Centre Front Upper Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 1 |
| Offside Front Lower Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Centre Front Upper Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Offside Rear Lower Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Offside Rear Brake pedal has inadequate reserve travel |3.1.3b| | 1 |
| Offside Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 1 |
| Offside Rear Direction indicator deteriorated and function impaired |1.5.3a| | 1 |
| Rear wheel spindle securing nut|s| loose |2.4.A.2b| | 1 |
| Handlebar mounting clamp bolt missing |2.1.1a| | 1 |
| Nearside Handlebar mounting insecure |2.2.1 |a| |i|| | 1 |
| Nearside Lower Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Headlamp aim beam image kick up to the offside |1.6| | 1 |
| Front Footrest insecure |6.2.1a| | 1 |
| Nearside Direction indicator not working |1.5.1c| | 1 |
| Rear Brake reaction bracket securing bolt|s| missing |3.2.A1j| | 1 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 1 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 1 |
| Rear Wheel bearing has excessive play |5.1.3 |a| |i|| | 1 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 1 |
| Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 1 |
| Rear Wheel spindle or securing nut|s| so insecure that wheel security or steering control is adversely affected |5.2.1 |c| |ii|| | 1 |
| Brake linkage has abnormal movement due to maladjustment |3.2.A1i| | 1 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Front Direction indicator not working |1.5.1c| | 1 |
| Rear Direction indicator not working |1.5.1c| | 1 |
| Front Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 1 |
| Stop lamp does not illuminate immediately a brake applies control 1 |1.3.1a| | 1 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 1 |
| Front Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 1 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 1 |
| Front Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 1 |
| Steering headbearing in such a condition that steering control is adversely affected notchie |2.2.2 |f| |ii|| | 1 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 1 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 1 |
| Rear Brake lining|s| less than 1.0 mm thick |1.1.13 |a|| | 1 |
| Front Horn not working (7.7 (a)) | 1 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Front Headlamp lens seriously defective (4.1.1 (b) (ii)) | 1 |
| Rear Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 1 |
| Headlamp aim so that beam "kick up" is not visible on the screen |1.6.B.1| | 1 |
| Rear wheel spindle loose |2.4.A.2b| | 1 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 1 |
| Nearside Front Direction indicator damaged and function impaired |1.5.3a| | 1 |
| Offside Front Throttle operating incorrectly |6.2.1f| | 1 |
| Front Handlebar deformed |2.1.1b| | 1 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 1 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 1 |
| Front suspension assembly component loose |2.3.1| | 1 |
| Offside Front Footrest insecure |6.2.1a| | 1 |
| Front position lamp adversely affected by the operation of another lamp |1.1.3b| | 1 |
| Rear Brake pedal is damaged and the brake cannot be readily applied |3.1.3c| | 1 |
| Direction indicators not working all lighting not tested |1.5.1c| | 1 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Exhaust is leaking and excessively noisey centre |7.1.1b| | 1 |
| Rear Exhaust mounting missing |7.1.1c| | 1 |
| Front Headlamp insecure |1.2.3b| | 1 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Wheel alignment incorrect which adversely affects the handling |2.4 |a|| | 1 |
| Rear Brake rod insecure |1.1.15 |c|| | 1 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 1 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 1 |
| Front Steering headbearing has excessive free play |2.2.2| | 1 |
| Offside Rear Rear wheel spindle securing nut locking device insecure |2.4.A.2b| | 1 |
| Offside Rear Brake reaction bracket securing bolt|s| missing |3.2.A1j| | 1 |
| Rear Rear position lamp insecure |1.1.1c| | 1 |
| Front Headlamp main beam affected by the operation of another lamp |1.2.2c| | 1 |
| Nearside Direction indicators affected by the operation of another lamp |1.5.1c| | 1 |
| Offside Direction indicators affected by the operation of another lamp |1.5.1c| | 1 |
| Rear Stop lamp affected by the operation of another lamp |1.3.2| | 1 |
| Front Lower Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 1 |
| Front Horn not working |1.7.3a| | 1 |
| Nearside Front Direction indicator not working |1.5.1c| | 1 |
| Centre Front Upper Motorcycle structure excessively corroded |6.1.1a| | 1 |
| Centre Rear Upper Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Nearside Front Direction indicator insecure |1.5.3b| | 1 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 1 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 1 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 1 |
| Front Front position lamp insecure |1.1.1c| | 1 |
| Offside Front Handlebar deformed |2.1.1b| | 1 |
| Front Front wheel spindle securing nut locking device missing |2.3.3a| | 1 |
| Centre Front Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Rear Brake linkage has abnormal movement due to maladjustment |3.2.A1i| | 1 |
| Rear Brake linkage has abnormal movement of levers indicating excessive wear or maladjustment rear brake excess travel indicating worn out rear brake shoes |1.1.15 |f|| | 1 |
| Rear Brake linkage has abnormal movement of levers indicating excessive wear or maladjustment travel on rear brake lever indicates excessive wear on rear brake shoes |1.1.15 |f|| | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 1 |