| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 308 |
| Drive chain excessively loose |6.2.1d| | 59 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 59 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 58 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 33 |
| Drive chain worn to excess |6.2.1e| | 32 |
| Stop lamp remains on when the brakes are released | 32 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 24 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 24 |
| Rear Position lamp not working (4.2.1 (a)) | 23 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 22 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 20 |
| Front Position lamp not working (4.2.1 (a)) | 19 |
| Front Brake excessively binding (1.2.1 (f)) | 19 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 19 |
| Rear Brake excessively binding (1.2.1 (f)) | 19 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 17 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 17 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 16 |
| Registration plate issues | 16 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 16 |
| Drive chain excessively tight |6.2.1d| | 15 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 15 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 15 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 14 |
| Rear Position lamp not working |4.2.1 |a|| | 14 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 14 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 14 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 14 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 13 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 13 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 13 |
| Headlamp aim not tested (4.1.2 (b)) | 13 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 12 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 12 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 11 |
| Headlamp insecure (4.1.1 (c)) | 11 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 11 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 10 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 10 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 10 |
| Drive chain sprocket worn to excess |6.2.1e| | 10 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Stop lamp not working |4.3.1 |a| |ii|| | 9 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 9 |
| Front Brake excessively binding |1.2.1 |f|| | 9 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 9 |
| Exhaust system insecure (6.1.2 (a)) | 9 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 9 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Steering headbearing has excessive free play |2.2.2| | 8 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 8 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 8 |
| Headlamp aim not tested |1.6| | 8 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 8 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 8 |
| Horn not working (7.7 (a) (ii)) | 8 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 8 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 8 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 8 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 8 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Headlamp insecure |1.2.3b| | 7 |
| Handlebar deformed |2.1.1b| | 7 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 7 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 7 |
| Front Headlamp insecure (4.1.1 (c)) | 7 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 7 |
| Headlamp aim beam image kick up to the offside |1.6| | 6 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 6 |
| Nearside Front Direction indicator not working |4.4.1 |a| |ii|| | 6 |
| Front Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 6 |
| Rear Brake excessively binding |1.2.1 |f|| | 6 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 6 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 6 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 6 |
| Wheel alignment incorrect which adversely affects the steering |2.4 |a|| | 6 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 6 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 6 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 6 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 6 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 5 |
| Drive chain excessively tight, so that it is likely to fail |6.1.7 |k| |ii|| | 5 |
| Drive chain horseshoe locking device incorrectly fitted |6.1.7 |j| |i|| | 5 |
| Drive chain sprocket so worn it is likely to fail |6.1.7 |c| |ii|| | 5 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 5 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 5 |
| Offside Front Footrest insecure |6.2.1a| | 5 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 5 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 5 |
| Rear Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 5 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Headlamp aim not tested |4.1.2 |b|| | 5 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 5 |
| Front Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 5 |
| Rear Brake lining(s) less than 1.0 mm thick (1.1.13 (a)) | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 5 |
| Rear Suspension arm attachment bracket/mounting insecure (5.3.3 (a) (i)) | 5 |
| Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 5 |
| Rear Brake grabbing severely (1.2.1 (c)) | 5 |
| Rear Brake pedal not releasing correctly and functionality of brakes affected (1.1.2 (b) (ii)) | 5 |
| Throttle control functioning such that safe operation of the motorcycle is adversely affected (6.2.7 (a) (ii)) | 5 |
| 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|| | 4 |
| Drive chain so worn it is likely to fail |6.1.7 |c| |ii|| | 4 |
| Headlamp insecure |4.1.1 |c|| | 4 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 4 |
| Rear Brake lining|s| less than 1.0 mm thick |1.1.13 |a|| | 4 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 4 |
| Rear Brake pedal has insufficient reserve travel |1.1.2 |a|| | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 4 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Nearside Front Footrest insecure |6.2.1a| | 4 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 4 |
| Wheel alignment incorrect which adversely affects the handling |2.4 |a|| | 4 |
| Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Registration plate lamp issues | 4 |
| Front Brake disc contaminated (1.1.14 (b)) | 4 |
| Rear Suspension arm pin or bush excessively worn (5.3.4 (a) (i)) | 4 |
| Rear Drive chain excessively loose (6.1.7 (c) (i)) | 4 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 4 |
| Rear Exhaust system insecure (6.1.2 (a)) | 4 |
| Rear Brake has no recorded effort at a wheel (1.2.1 (a) (ii)) | 4 |
| Rear Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 4 |