| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 77 |
| Rear reflector missing (4.8.2 (a) (ii)) | 43 |
| Registration plate lamp issues | 41 |
| Rear reflector on motorcycle missing |1.4.1| | 32 |
| Registration plate issues | 31 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 21 |
| Rear reflector missing |4.8.2 |a| |ii|| | 18 |
| Drive chain excessively loose |6.2.1d| | 18 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 15 |
| Drive chain worn to excess |6.2.1e| | 14 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 13 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 12 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 12 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 12 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 11 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 11 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 10 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 10 |
| Front wheel bearings have excessive free play |2.3.5b| | 9 |
| Nearside Rear Footrest missing |6.2.12 |a|| | 9 |
| Offside Rear Footrest missing |6.2.12 |a|| | 9 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 9 |
| Offside Rear Footrest missing (6.2.12 (a)) | 9 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 9 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 9 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 9 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 8 |
| Rear Wheel bearing has excessive play |5.1.3 |a| |i|| | 8 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 8 |
| Horn not working (7.7 (a) (ii)) | 8 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 8 |
| Rear Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 7 |
| Rear reflector on motorcycle obscured |1.4.2b| | 7 |
| Rear Brake excessively binding (1.2.1 (f)) | 7 |
| Horn not working (7.7 (a)) | 7 |
| Headlamp insecure (4.1.1 (c)) | 7 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 7 |
| Nearside Front Direction indicators not working |1.5.1c| | 7 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 7 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 7 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 7 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 7 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 7 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 6 |
| Throttle control functioning such that safe operation of the motorcycle is adversely affected (6.2.7 (a) (ii)) | 6 |
| Rear Footrest missing (6.2.12 (a)) | 6 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 6 |
| Front Position lamp not working (4.2.1 (a)) | 6 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 6 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 6 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Rear Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 5 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 5 |
| Nearside Rear Direction indicator likely to become detached |4.4.1 |c| |ii|| | 5 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Horn not working |7.7 |a| |ii|| | 5 |
| Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 5 |
| Offside Rear Direction indicators not working |1.5.1c| | 5 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 5 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 5 |
| Front Brake excessively binding (1.2.1 (f)) | 5 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 5 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Front Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 4 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Rear Lower Suspension component pin or bush excessively worn (5.3.4 (a) (i)) | 4 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 4 |
| Drive chain so worn it is likely to fail |6.1.7 |c| |ii|| | 4 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Steering headbearing has excessive free play |2.2.2| | 4 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 4 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 4 |
| Rear Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 4 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Nearside Front Direction indicator not working |4.4.1 |a| |ii|| | 4 |
| All direction indicators not working |4.4.1 |a| |ii|| | 4 |
| Rear Shock absorber has an excessively worn bush (5.3.2 (c)) | 4 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Headlamp aim not tested (4.1.2 (b)) | 4 |
| Drive chain excessively tight |6.2.1d| | 4 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 4 |
| Rear Suspension component pin or bush excessively worn (5.3.4 (a) (i)) | 4 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 4 |
| Rear Brake excessively binding |1.2.1 |f|| | 4 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Nearside Rear Direction indicator not working |1.5.1c| | 4 |
| Throttle operating incorrectly |6.2.7 |a| |i|| | 4 |
| Headlamp insecure |1.2.3b| | 4 |
| Rear Brake disc|s| has excessive run out |3.2.A1m| | 3 |
| Offside Front Direction indicator not working |4.4.1 |a| |ii|| | 3 |
| Headlamp aim so that beam "kick up" is not visible on the screen |4.1.2 |a|| | 3 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 3 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 3 |
| Offside Rear Direction indicator likely to become detached |4.4.1 |c| |ii|| | 3 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 3 |
| Front Position lamp not working |4.2.1 |a|| | 3 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 3 |
| Handlebar excessively deformed (2.2.1 (c) (i)) | 3 |
| Headlamp insecure |4.1.1 |c|| | 3 |
| Rear Footrest missing no pillion footrests fitted (6.2.12 (a)) | 3 |
| All direction indicators not working (4.4.1 (a) (ii)) | 3 |
| Rear Suspension arm pin or bush excessively worn (5.3.4 (a) (i)) | 3 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 3 |
| Offside Rear Direction indicator not working |4.4.1 |a| |ii|| | 3 |
| Rear Footrest missing |6.2.12 |a|| | 3 |
| Front suspension assembly component excessively misaligned |2.3.1| | 3 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Rear Brake disc significantly and obviously worn |1.1.14 |a| |i|| | 3 |
| Rear Drive chain excessively loose |6.2.1d| | 3 |
| Horn not working |1.7.3a| | 2 |
| Front Brake lever is so short that the brake cannot be readily applied |1.1.2 |d|| | 2 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 2 |
| Nearside Rear Direction indicator likely to become detached (4.4.1 (c) (ii)) | 2 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 2 |
| Horn missing |1.7.1| | 2 |
| Rear Drive chain sprocket so worn it is likely to fail |6.1.7 |c| |ii|| | 2 |
| Offside Rear Direction indicator lens defective such that the emitted light is adversely affected |4.4.1 |b| |ii|| | 2 |
| Front Brake lever has insufficient reserve travel (1.1.2 (a)) | 2 |
| Front Headlamp aim not tested (4.1.2 (b)) | 2 |
| Nearside Rear Direction indicators not working |1.5.1c| | 2 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 2 |
| Front Drive chain sprocket so worn it is likely to fail |6.1.7 |c| |ii|| | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 2 |
| Rear Direction indicators not working |1.5.1c| | 2 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 2 |
| Front Handlebar deformed |2.1.1b| | 2 |
| Front Wheel bearing has excessive play |5.1.3 |a| |i|| | 2 |
| Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Offside Rear Direction indicator incorrect colour (4.4.3 (a)) | 2 |
| Throttle operating incorrectly |6.2.1f| | 2 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 2 |
| Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Throttle control functioning such that safe operation of the motorcycle is adversely affected |6.2.7 |a| |ii|| | 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 |
| Front Brake disc significantly and obviously worn |1.1.14 |a| |i|| | 2 |
| Rear Wheel spindle or securing nut(s) so insecure that wheel security or steering control is adversely affected (5.2.1 (c) (ii)) | 2 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 2 |
| Offside Front Throttle control functioning such that safe operation of the motorcycle is adversely affected (6.2.7 (a) (ii)) | 2 |
| Rear Upper Suspension component pin or bush excessively worn (5.3.4 (a) (i)) | 2 |
| Front Brake lever is so short that the brake cannot be readily applied (1.1.2 (d)) | 2 |
| Rear Upper Shock absorber has an excessively worn bush (5.3.2 (c)) | 2 |
| Offside Rear Direction indicator likely to become detached (4.4.1 (c) (ii)) | 2 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 2 |
| Headlamp switch faulty |1.2.4| | 2 |
| Indicator switch insecure |1.5.4| | 2 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 2 |
| Rear Roller brake test indicates a severely juddering brake |3.3.A1b| | 2 |
| Brake lever cannot be applied smoothly |3.1.3d| | 2 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 2 |
| Riders seat insecure |6.2.5 |a| |ii|| | 2 |
| Front Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 2 |
| Riders seat insecure |6.2.1a| | 2 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 2 |
| Fuel system component leaking |6.1.3 |b| |i|| | 2 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 2 |
| Rear Shock absorber has an excessively worn bush |5.3.2 |c|| | 2 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 2 |
| Front Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 2 |
| Dipswitch does not operate immediately when selected on main beam (4.1.3 (b)) | 2 |
| Offside Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Dipswitch does not deflect the main beam/s, making them into dipped beam/s |1.2.2b|ii|| | 2 |
| Rear Wheel bearing play so excessive it is likely to break up |5.1.3 |a| |ii|| | 2 |
| Rear Brake caliper operating mechanism has excessive travel |1.1.16 |e| |i|| | 2 |
| Nearside Rear Suspension component ball joint excessively worn main swinging arm |5.3.4 |a| |i|| | 2 |
| Central Rear Lower Suspension component ball joint excessively worn |5.3.4 |a| |i|| | 2 |
| Rear Brake clevis joint excessively worn |1.1.15 |b|| | 2 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Horn sound not in accordance with requirements |7.7 |c|| | 2 |
| Dipswitch does not operate immediately when selected on dipped beam (4.1.3 (b)) | 2 |
| Front Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Rear Footrest missing |6.2.1a| | 2 |
| Offside Rear Direction indicator not working |1.5.1c| | 2 |
| Chain guard insecure |6.2.1c| | 2 |
| Rear Lower Shock absorber has an excessively worn bush (5.3.2 (c)) | 2 |
| Rear Drive chain worn to excess (6.1.7 (c) (i)) | 2 |
| Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 2 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 2 |
| Central Rear Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Handlebar deformed |2.1.1b| | 2 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Nearside Rear Direction indicators flashing more than 120 times per minute |1.5.1c| | 2 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |