| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 50 |
| Drive chain excessively loose |6.2.1d| | 38 |
| Drive chain worn to excess |6.2.1e| | 20 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 18 |
| Rear reflector on motorcycle missing |1.4.1| | 16 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 15 |
| Registration plate issues | 14 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 10 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 10 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 10 |
| Rear reflector missing (4.8.2 (a) (ii)) | 8 |
| Drive chain excessively loose (6.2.1d) | 8 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 8 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 7 |
| Horn not working |1.7.3a| | 7 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 7 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 6 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 6 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 6 |
| Drive chain worn to excess (6.2.1e) | 5 |
| Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Front wheel bearings are excessively rough |2.3.5b| | 5 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Nearside Rear Direction indicators not working |1.5.1c| | 5 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 5 |
| Front Brake excessively binding (1.2.1 (f)) | 4 |
| Handlebar deformed |2.1.1b| | 4 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 4 |
| Drive chain excessively tight |6.2.1d| | 4 |
| Riders seat insecure |6.2.1a| | 4 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 4 |
| Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 4 |
| Steering headbearing has excessive free play |2.2.2| | 4 |
| Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Stop lamp remains on when the brakes are released | 4 |
| Rear reflector missing |4.8.2 |a| |ii|| | 3 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 3 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 3 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 3 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Rear reflector on motorcycle missing (1.4.1) | 3 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Stop lamp does not illuminate immediately a brake applies (1.3.1a) | 3 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Rear Drive chain worn to excess |6.2.1e| | 3 |
| Rear Drive chain excessively loose |6.2.1d| | 3 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Nearside Rear Direction indicator not working |1.5.1c| | 2 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Rear Position lamp not working (4.2.1 (a)) | 2 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 2 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 2 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 2 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Horn not working (1.7.3a) | 2 |
| Rear reflector on motorcycle obscured |1.4.1| | 2 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 2 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Brake pedal has insufficient reserve travel (1.1.2 (a)) | 2 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 2 |
| Front Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Indicator switch insecure |1.5.4| | 2 |
| Throttle operating incorrectly |6.2.1f| | 2 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 2 |
| Rear Rear reflector on motorcycle obscured |1.4.1| | 2 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Riders seat insecure (6.2.1a) | 2 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 2 |
| Horn not working (7.7 (a)) | 2 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Rear Direction indicators not working |1.5.1c| | 2 |
| Nearside Front Direction indicator damaged and function impaired |1.5.3a| | 2 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Nearside Rear Footrest missing |6.2.1a| | 2 |
| Offside Rear Footrest missing |6.2.1a| | 2 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 2 |
| Wheel spoke excessively loose |4.2.1b| | 2 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Front Brake fluid contaminated (1.8 (a)) | 2 |
| Rear Direction indicator likely to become detached |4.4.1 |c| |ii|| | 2 |
| Fuel system component leaking Fuel tap is leaking. (6.1.3 (b) (i)) | 1 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 1 |
| Fuel system component leaking Fuel leaking from carb over flow. (6.1.3 (b) (i)) | 1 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 1 |
| Rear reflector on motorcycle obscured |1.4.2b| | 1 |
| Stop lamp does not illuminate immediately a brake applies front brake operation
|1.3.1a| | 1 |
| Nearside Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 1 |
| Offside Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 1 |
| Rear Rear position lamp damaged and function impaired |1.1.1b| | 1 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 1 |
| Rear Drive chain excessively tight |6.2.1d| | 1 |
| Front Wheel spoke excessively bent |4.2.1b| | 1 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 1 |
| Rear position lamp does not illuminate immediately when it is switched on (1.1.3a) | 1 |
| Exhaust mounting does not fully support the exhaust system (7.1.1.c) | 1 |
| Exhaust is leaking and excessively noisey (7.1.1b) | 1 |
| Front Roller brake test indicates a binding brake (3.3.A1a) | 1 |
| Front Brake disc significantly and obviously worn |1.1.14 |a| |i|| | 1 |
| Front Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 1 |
| Centre Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Centre Rear Stop lamp insecure |1.3.3b| | 1 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 1 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 1 |
| All position lamps adversely affected by the operation of another lamp |1.1.3b| | 1 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 1 |
| Rear Footrest missing |6.2.1a| | 1 |
| Rear Brake effort inadequate at a wheel (1.2.1 (a) (i)) | 1 |
| Riders seat insecure (6.2.5 (a) (ii)) | 1 |
| Offside Rear Direction indicators not working |1.5.1c| | 1 |
| All direction indicators missing |4.4.1 |a| |ii|| | 1 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 1 |
| Registration plate lamp issues | 1 |
| 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|| | 1 |
| Nearside Direction indicator flashing more than 120 times per minute |1.5.1c| | 1 |
| Offside Direction indicator flashing more than 120 times per minute |1.5.1c| | 1 |
| Upper Fork yoke insecure Fork yoke securing nut loose. (2.2.2 (d) (i)) | 1 |
| Headlamp incorrect colour |1.2.1| | 1 |
| Rear reflector on motorcycle obscured (1.4.1) | 1 |
| Direction indicators not working |1.5.1c| | 1 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 1 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 1 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 1 |
| Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Rear Drive chain worn to excess (6.1.7 (c) (i)) | 1 |
| Front Wheel bearing rough when rotated |5.1.3 |b| |i|| | 1 |
| Rear Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 1 |
| Rear Inner Direction indicator likely to become detached (4.4.1 (c) (ii)) | 1 |
| Rear Brake pedal is positioned so that the brake cannot be readily applied (1.1.2 (d)) | 1 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 1 |
| Nearside Front Front suspension assembly component excessively bent |2.3.1| | 1 |
| Offside Front Front suspension assembly component excessively bent |2.3.1| | 1 |
| Rear wheel insecure |4.2.3b| | 1 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 1 |
| Rear Brake excessively binding (1.2.1 (f)) | 1 |
| Position lamp switch insecure |1.1.4b| | 1 |
| Brake pedal has inadequate reserve travel out off adjustment |3.1.3b| | 1 |
| Nearside Front Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 1 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 1 |
| Offside Rear Footrest missing (6.2.12 (a)) | 1 |
| Nearside Front Footrest insecure |6.2.1a| | 1 |
| Front Riders seat insecure |6.2.1a| | 1 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 1 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 1 |
| Drive chain sprocket so worn it is likely to fail |6.1.7 |c| |ii|| | 1 |
| Rear reflector missing Obscured by "L" plate |4.8.2 |a| |ii|| | 1 |
| Footrest missing Pillion Footrests |6.2.12 |a|| | 1 |
| Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Brake performance not tested front and rear (1.2.1 (g)) | 1 |
| Rear Decelerometer brake test indicates a binding brake |3.3.E1d| | 1 |
| Front Fuel cap ineffective Fuel cap cannot be opened for inspection. |6.1.3 |b| |i|| | 1 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 1 |
| Front Headlamp insecure |1.2.3b| | 1 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 1 |
| Nearside Direction indicators not working |1.5.1c| | 1 |
| Rear Brake pedal is inoperative |3.1.3c| | 1 |
| Rear Direction indicator not working |1.5.1c| | 1 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 1 |
| Headlamp insecure (4.1.1 (c)) | 1 |
| Front Brake master cylinder fluid level dangerously low |3.2.B1d| | 1 |
| Rear reflector on motorcycle damaged and function impaired |1.4.2a| | 1 |
| Rear Brake linkage has abnormal movement due to excessive wear |3.2.A1i| | 1 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 1 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Stop lamp not working |4.3.1 |a| |ii|| | 1 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Rear reflector missing hidden by `L` plate |4.8.2 |a| |ii|| | 1 |
| Riders seat insecure securing bolt missing |6.2.5 |a| |ii|| | 1 |
| Rear Brake grabbing severely (1.2.1 (c)) | 1 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 1 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 1 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 1 |
| Rear Brake has no recorded effort at a wheel (1.2.1 (a) (ii)) | 1 |
| Front Headlamp insecure (4.1.1 (c)) | 1 |
| Front Upper Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 1 |
| Headlamp aim not tested (4.1.2 (b)) | 1 |
| Rear Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 1 |
| Front Throttle operating incorrectly |6.2.1f| | 1 |
| Rear Wheel spoke excessively corroded |4.2.1b| | 1 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 1 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 1 |
| Brake lever cannot be applied smoothly |3.1.3d| | 1 |
| Nearside Front Direction indicator adversely affected by the operation of another lamp (4.4.3 (b)) | 1 |
| Rear Footrest missing (6.2.12 (a)) | 1 |
| Nearside Rear Wheel fixing missing (single fixing) Wheel adjuster plate and nut (5.2.1 (a) (ii)) | 1 |
| Offside Front Direction indicator insecure |1.5.3b| | 1 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Front Brake lever has insufficient reserve travel |1.1.2 |a|| | 1 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 1 |
| Fuel cap ineffective |6.1.3 |b| |i|| | 1 |
| Offside Handlebar grip insecure to handlebar switch gear loose (2.2.1 (d) (ii)) | 1 |
| Horn not working |7.7 |a| |ii|| | 1 |
| Offside Rear Rear wheel spindle securing nut locking device insecure |2.4.A.2b| | 1 |
| Offside Front Handlebar deformed |2.1.1b| | 1 |
| Offside Rear Brake pedal is damaged and the brake cannot be readily applied |3.1.3c| | 1 |
| Front Brake excessively binding |1.2.1 |f|| | 1 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 1 |
| Offside Rear Brake component modification unsafe brake locking bolt fitting incorrectly. |1.1.21 |d| |i|| | 1 |
| Rear Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 1 |
| Nearside Rear Footrest missing |6.2.12 |a|| | 1 |
| Offside Rear Footrest missing |6.2.12 |a|| | 1 |
| Nearside Front Direction indicator not working |1.5.1c| | 1 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 1 |
| Front Stop lamp does not illuminate immediately a brake applies (1.3.1a) | 1 |
| Handlebar deformed (2.1.1b) | 1 |
| Rear Position lamp not working |4.2.1 |a|| | 1 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 1 |
| Offside Rear Footrest insecure |6.2.1a| | 1 |
| Rear Drive chain sprocket worn to excess (6.2.1e) | 1 |
| Position lamp adversely affected by the operation of another lamp Shining above dip beam cut off (4.2.3 (b)) | 1 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 1 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 1 |
| Rear shock absorber insecurely mounted |2.4.A.3b| | 1 |
| Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 1 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Offside Rear Direction indicator insecure |1.5.3b| | 1 |
| Nearside Rear Direction indicator likely to become detached (4.4.1 (c) (ii)) | 1 |
| Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 1 |
| Offside Rear Footrest missing (6.2.1a) | 1 |
| Nearside Rear Footrest missing (6.2.1a) | 1 |
| Nearside Footrest insecure |6.2.1a| | 1 |
| Offside Front Position lamp switch insecure |1.1.4b| | 1 |
| Front Lower Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Drive chain sprocket so worn it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Steering control handlebar movement restricted by taut cables |2.1.2c| | 1 |
| Rear Wheel spoke excessively bent (4.2.1b) | 1 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock (2.1.4) | 1 |