| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 62 |
| Drive chain excessively loose |6.2.1d| | 29 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 27 |
| Rear reflector on motorcycle missing |1.4.1| | 23 |
| Horn not working |1.7.3a| | 18 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 18 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 17 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 14 |
| Steering headbearing has excessive free play |2.2.2| | 14 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 14 |
| Drive chain worn to excess |6.2.1e| | 14 |
| Registration plate lamp issues | 12 |
| Throttle operating incorrectly |6.2.1f| | 11 |
| Brake hose excessively deteriorated | 11 |
| Rear reflector missing (4.8.2 (a) (ii)) | 10 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 10 |
| Registration plate issues | 10 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 10 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 9 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 8 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 8 |
| Offside Rear Direction indicators not working |1.5.1c| | 8 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 8 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| Nearside Front Direction indicators not working |1.5.1c| | 7 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 7 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Nearside Rear Direction indicators not working |1.5.1c| | 7 |
| Riders seat insecure |6.2.1a| | 6 |
| Offside Rear Footrest missing |6.2.1a| | 6 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 6 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 6 |
| Exhaust noise is clearly in excess of that emitted by a similar motor bicycle fitted with a standard silencer in average condition |7.1.2| | 6 |
| Front Brake excessively binding (1.2.1 (f)) | 6 |
| Rear Wheel spoke excessively loose |4.2.1b| | 6 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 6 |
| Front wheel bearings have excessive free play |2.3.5b| | 6 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 6 |
| Rear Position lamp not working |4.2.1 |a|| | 6 |
| Nearside Rear Footrest missing |6.2.1a| | 5 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 5 |
| Front Brake disc contaminated (1.1.14 (b)) | 5 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 5 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Handlebar deformed |2.1.1b| | 5 |
| Rear Footrest missing |6.2.1a| | 5 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 5 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 5 |
| Nearside Rear Direction indicator not working |1.5.1c| | 5 |
| Nearside Front Direction indicator not working |1.5.1c| | 5 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Rear Shock absorber has negligible damping effect |5.3.2 |b|| | 4 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 4 |
| Headlamp aim beam image kick up to the offside |1.6| | 4 |
| Indicator switch insecure |1.5.4| | 4 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 4 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Rear Position lamp not working (4.2.1 (a)) | 4 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 4 |
| Headlamp aim not tested |4.1.2 |b|| | 4 |
| Rear wheel has a loose wheel nut|s| |4.2.3a| | 4 |
| Front wheel bearings are excessively rough |2.3.5b| | 4 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 4 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 4 |
| Exhaust system insecure (6.1.2 (a)) | 4 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Offside Rear Footrest missing (6.2.12 (a)) | 3 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 3 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 3 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 3 |
| Position lamp switch insecure |1.1.4b| | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 3 |
| Stop lamp remains on when the brakes are released | 3 |
| Horn not working |7.7 |a| |ii|| | 3 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 3 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 3 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 3 |
| Front Position lamp not working |4.2.1 |a|| | 3 |
| Throttle operating incorrectly |6.2.7 |a| |i|| | 3 |
| Front suspension has inadequate damping effect. |2.3.6c| | 3 |
| Headlamp switch faulty |1.2.4| | 3 |
| Rear reflector missing |4.8.2 |a| |ii|| | 3 |
| Stop lamp insecure |1.3.3b| | 3 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 3 |
| Brake hose damaged | 3 |
| Handlebar mounting clamp loose |2.1.1a| | 3 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 3 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 3 |
| Headlamp insecure |1.2.3b| | 3 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Exhaust excessively deteriorated |7.1.1a| | 3 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 3 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 3 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Rear Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 3 |
| Horn not working (7.7 (a) (ii)) | 2 |
| Front Position lamp not working (4.2.1 (a)) | 2 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 2 |
| Front Brake excessively binding |1.2.1 |f|| | 2 |
| All direction indicators not working |4.4.1 |a| |ii|| | 2 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 2 |
| Front Shock absorber has negligible damping effect (5.3.2 (b)) | 2 |
| Rear Brake lever has insufficient reserve travel (1.1.2 (a)) | 2 |
| Offside Rear Direction indicator not working |1.5.1c| | 2 |
| Chain guard insecure |6.2.1c| | 2 |
| Offside Front Direction indicator not working |1.5.1c| | 2 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Exhaust system insecure |6.1.2 |a|| | 2 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 2 |
| Front Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 2 |
| Rear Brake excessively binding |1.2.1 |f|| | 2 |
| Front Wheel spoke excessively loose |4.2.1b| | 2 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 2 |
| Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 2 |
| Nearside Direction indicators not working |1.5.1c| | 2 |
| Front Handlebar deformed |2.1.1b| | 2 |
| Front Steering headbearing has excessive free play |2.2.2| | 2 |
| Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| All direction indicators not working (4.4.1 (a) (ii)) | 2 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 2 |
| Front Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 2 |
| Headlamp insecure |4.1.1 |c|| | 2 |
| Rear Suspension arm pin or bush excessively worn |5.3.4 |a| |i|| | 2 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Nearside Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 2 |
| Offside Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 2 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Fuel system component leaking |7.2.1a| | 2 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 2 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 2 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Front Roller brake test indicates a severely juddering brake |3.3.A1b| | 2 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 2 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 2 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Headlamp aim so that beam "kick up" is not visible on the screen |4.1.2 |a|| | 2 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 2 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 2 |
| Nearside Front Footrest insecure (6.2.12 (a)) | 2 |
| Rear reflector on motorcycle obscured |1.4.1| | 2 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Rear Brake locking device missing |3.2.A1e| | 2 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Headlamp aim so that beam "kick up" is not visible on the screen |1.6.B.1| | 2 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 2 |
| Direction indicators not working |1.5.1c| | 2 |
| Offside Front Direction indicators not working |1.5.1c| | 2 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 2 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 2 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 2 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 2 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 2 |
| Nearside Handlebar deformed |2.1.1b| | 2 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Rear Brake master cylinder leaking hydraulic fluid |3.2.B1e| | 2 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 2 |
| Exhaust silencer insecure (8.1.1 (b) (i)) | 2 |
| Drive chain excessively tight, so that it is likely to fail |6.1.7 |k| |ii|| | 2 |
| Rear Roller brake test indicates a severely juddering brake |3.3.A1b| | 2 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |