| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 69 |
| Drive chain excessively loose |6.2.1d| | 28 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 19 |
| Handlebar deformed |2.1.1b| | 17 |
| Rear reflector on motorcycle missing |1.4.1| | 17 |
| Drive chain worn to excess |6.2.1e| | 16 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 15 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 15 |
| Front Brake excessively binding (1.2.1 (f)) | 10 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 10 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 9 |
| Headlamp insecure (4.1.1 (c)) | 9 |
| Rear reflector on motorcycle obscured |1.4.2b| | 9 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 8 |
| Horn not working |1.7.3a| | 8 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 8 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 8 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 8 |
| Registration plate issues | 8 |
| Drive chain excessively tight |6.2.1d| | 8 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 7 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 7 |
| Rear Brake excessively binding |1.2.1 |f|| | 7 |
| Rear reflector on motorcycle obscured |1.4.1| | 7 |
| Rear reflector missing (4.8.2 (a) (ii)) | 7 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 6 |
| Headlamp insecure |1.2.3b| | 6 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 6 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 5 |
| Headlamp aim not tested (4.1.2 (b)) | 5 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Steering headbearing has excessive free play |2.2.2| | 5 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 5 |
| Rear reflector missing |4.8.2 |a| |ii|| | 5 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 5 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 5 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| All direction indicators not working (4.4.1 (a) (ii)) | 5 |
| Front Brake excessively binding |1.2.1 |f|| | 5 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 5 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Rear Drive chain excessively loose |6.2.1d| | 4 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 4 |
| Rear Position lamp not working (4.2.1 (a)) | 4 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 4 |
| Rear Brake excessively binding (1.2.1 (f)) | 4 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 4 |
| Front Position lamp not working (4.2.1 (a)) | 4 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 4 |
| Rear Rear reflector on motorcycle obscured |1.4.1| | 4 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 3 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 3 |
| Handlebar fouling on the fuel tank or bodywork on full lock |2.1.4 |b|| | 3 |
| Handlebar deformed to the extent that steering is affected (2.2.1 (c) (ii)) | 3 |
| Front Handlebar deformed |2.1.1b| | 3 |
| Nearside Front Direction indicator not working |1.5.1c| | 3 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 3 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 3 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 3 |
| Rear Drive chain worn to excess (6.1.7 (c) (i)) | 3 |
| Registration plate lamp issues | 3 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 3 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 3 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Dipswitch does not operate immediately when selected on main beam (4.1.3 (b)) | 3 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 3 |
| Front Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 3 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Drive chain horseshoe locking device incorrectly fitted |6.1.7 |j| |i|| | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 3 |
| Wheel alignment incorrect which adversely affects the handling |2.4 |a|| | 3 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 3 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Front Headlamp insecure (4.1.1 (c)) | 2 |
| Nearside Rear Direction indicator missing (4.4.1 (a) (ii)) | 2 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Headlamp insecure |4.1.1 |c|| | 2 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 2 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 2 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 2 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Front Position lamp not working |4.2.1 |a|| | 2 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 2 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 2 |
| All position lamps not working (4.2.1 (a)) | 2 |
| Rear Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 2 |
| Rear Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 2 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 2 |
| Rear Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 2 |
| Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Drive chain so worn it is likely to fail |6.1.7 |c| |ii|| | 2 |
| Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 2 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 2 |
| Dipswitch does not operate immediately when selected on dipped beam (4.1.3 (b)) | 2 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 2 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 2 |
| Nearside Rear Direction indicators not working |1.5.1c| | 2 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 2 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Front Brake lever is bent and the brake cannot be readily applied (1.1.2 (d)) | 2 |
| Stop lamp remains on when the brakes are released | 2 |
| Front Brake grabbing severely (1.2.1 (c)) | 2 |
| Nearside Front Direction indicators not working |1.5.1c| | 2 |
| Offside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 2 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Rear Wheel bearing play so excessive it is likely to break up |5.1.3 |a| |ii|| | 2 |
| Handlebar deformed to the extent that steering is affected |2.2.1 |c| |ii|| | 2 |
| Rear Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 2 |
| Nearside Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| Front Shock absorber has negligible damping effect (5.3.2 (b)) | 2 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 2 |
| Front Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 2 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 2 |
| Offside Front Brake caliper damaged and braking performance affected |1.1.16 |a| |ii|| | 2 |