| Most common failures | No# failures |
|---|
| Registration plate issues | 46 |
| Headlamp aim out of alignment | 30 |
| Drive chain excessively loose |6.2.1d| | 20 |
| Rear reflector on motorcycle missing |1.4.1| | 18 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 17 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 13 |
| Registration plate lamp issues | 10 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 9 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 7 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 7 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 6 |
| Horn not working |1.7.3a| | 5 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 5 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 4 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Steering headbearing has excessive free play |2.2.2| | 4 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 4 |
| Drive chain worn to excess |6.2.1e| | 4 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 4 |
| Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Rear reflector missing |4.8.2 |a| |ii|| | 3 |
| Rear Wheel bearing has excessive play |5.1.3 |a| |i|| | 3 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 3 |
| Rear Footrest missing |6.2.1a| | 3 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Rear Position lamp not working (4.2.1 (a)) | 3 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 3 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 2 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Drive chain excessively tight |6.1.7 |k| |i|| | 2 |
| Offside Rear Footrest missing |6.2.1a| | 2 |
| Horn sounds harsh or grating |1.7.3c| | 2 |
| Rear Drive chain excessively loose |6.2.1d| | 2 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Handlebar deformed |2.1.1b| | 2 |
| Offside Front Direction indicators not working |1.5.1c| | 2 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 2 |
| Nearside Rear Footrest missing |6.2.1a| | 2 |
| Nearside Rear Direction indicators not working |1.5.1c| | 2 |
| Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Horn not working (7.7 (a) (ii)) | 2 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Rear Direction indicators not working |1.5.1c| | 1 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Rear Drive chain excessively tight |6.2.1d| | 1 |
| Nearside Indicator switch insecure |1.5.4| | 1 |
| Centre Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 1 |
| Centre Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 1 |
| Centre Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Rear Drive chain sprocket excessively loose |6.1.7 |c| |i|| | 1 |
| Wheel alignment incorrect which adversely affects the handling |2.4 |a|| | 1 |
| Rear Brake component inadequately mounted |1.1.21 |c|| | 1 |
| Front wheel spindle securing nut|s| loose |2.3.5a| | 1 |
| Rear reflector on motorcycle incorrectly positioned |1.4.2d| | 1 |
| Rear Direction indicator not working |1.5.1c| | 1 |
| Offside Front Footrest insecure |6.2.1a| | 1 |
| Headlamp switch faulty |1.2.4| | 1 |
| Horn not working |7.7 |a| |ii|| | 1 |
| Headlamp deteriorated and function impaired |1.2.3a| | 1 |
| Rear wheel spindle loose |2.4.A.2b| | 1 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 1 |
| Throttle operating incorrectly |6.2.1f| | 1 |
| Direction indicators flashing more than 120 times per minute indicator relay |1.5.1c| | 1 |
| Direction indicators not working |1.5.1c| | 1 |
| Horn control defective |1.7.2a| | 1 |
| Nearside Rear Direction indicator not working |1.5.1c| | 1 |
| Nearside Rear Direction indicator obscured |1.5.1a| | 1 |
| Offside Rear Direction indicator obscured |1.5.1a| | 1 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Front Direction indicator affected by the operation of another lamp |1.5.1c| | 1 |
| Rear Direction indicator affected by the operation of another lamp |1.5.1c| | 1 |
| All direction indicators incorrect colour Lenses/bulbs sun-bleached |4.4.3 |a|| | 1 |
| Exhaust has a major leak of exhaust gases Blowing at collector |6.1.2 |a|| | 1 |
| Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Handlebar fractured |2.1.1b| | 1 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 1 |
| Nearside Front Direction indicator not working |1.5.1c| | 1 |
| Drive chain excessively tight |6.2.1d| | 1 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 1 |
| Stop lamp does not illuminate immediately a brake applies front and rear brake lights not working |1.3.1a| | 1 |
| Drive chain sprocket carrier worn to excess bearing has excessive free play |6.2.1e| | 1 |
| Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Offside Front Shock absorber has a serious fluid leak offside front fork seal leaking |5.3.2 |b|| | 1 |
| Handlebar mounting clamp loose |2.1.1a| | 1 |
| Nearside Front Direction indicators not working |1.5.1c| | 1 |
| Nearside Rear Footrest insecure |6.2.1a| | 1 |
| Front Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 1 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 1 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 1 |
| Nearside Footrest missing |6.2.1a| | 1 |
| Offside Footrest missing |6.2.1a| | 1 |
| Front Position lamp not working |4.2.1 |a|| | 1 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 1 |
| Nearside Locking devices not correctly fitted which may make the motor bicycle dangerous to ride no locking on rider footpeg pivot |6.2.1h| | 1 |
| Offside Locking devices not correctly fitted which may make the motor bicycle dangerous to ride no locking on riders footpeg pivot |6.2.1h| | 1 |
| Nearside Rear wheel spindle securing nut locking device insecure |2.4.A.2b| | 1 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 1 |
| Throttle operating incorrectly Sticking |6.2.1f| | 1 |
| Drive chain sprocket carrier worn to excess Cush Drive Rubbers |6.2.1e| | 1 |
| Central Rear Position lamp not working |4.2.1 |a|| | 1 |
| Rear position lamp insecure |1.1.1c| | 1 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 1 |
| Rear position lamp damaged and function impaired |1.1.1b| | 1 |
| Nearside Steering lock stop ineffective |2.1.3| | 1 |
| Nearside Rear Direction indicator not working |4.4.1 |a| |ii|| | 1 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 1 |
| Rear Brake lever pivot excessively worn |1.1.1 |b|| | 1 |
| Rear Drive chain sprocket carrier worn to excess play in carrier bearing |6.2.1e| | 1 |
| Offside Direction indicator not working |1.5.1c| | 1 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Front Front wheel spindle loose |2.3.5a| | 1 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 1 |
| Rear Stop lamp insecure |1.3.3b| | 1 |
| Drive chain fouling another component |6.2.1d| | 1 |
| Front position lamp incorrect colour |1.1.2a| | 1 |
| Brake pedal mounting cracked . |3.1.2c| | 1 |
| 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| | 1 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 1 |
| Rear wheel has a loose wheel nut|s| |4.2.3a| | 1 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 1 |
| Front Brake excessively binding |1.2.1 |f|| | 1 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Rear Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 1 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 1 |
| Front Headlamp aim so that beam "kick up" is not visible on the screen |4.1.2 |a|| | 1 |
| Offside Brake pedal is bent and the brake cannot be readily applied |1.1.2 |d|| | 1 |
| Footrest insecure rear n/s |6.2.1a| | 1 |
| Offside Direction indicators not working |1.5.1c| | 1 |
| Centre Front Handlebar deformed |2.1.1b| | 1 |
| Centre Rear Rear reflector on motorcycle missing |1.4.1| | 1 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 1 |
| Rear Wheel bearing has excessive play sprocket carrier (5.1.3 (a) (i)) | 1 |
| Rear Wheel hub excessively worn cush drive rubbers (5.2.1 (b) (i)) | 1 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 1 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 1 |
| Rear Direction indicator not working both rear indicators not working (4.4.1 (a) (ii)) | 1 |
| Central Front Steering damper in such a condition that the steering action is adversely affected No damping on front forks (2.1.4 (d) (ii)) | 1 |
| Rear Wheel bearing has excessive play rear wheel bearing has excessive play (5.1.3 (a) (i)) | 1 |
| Rear Drive chain worn to excess (6.1.7 (c) (i)) | 1 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Rear Motorcycle structure joining/attachment plate or fastening so insecure that structural rigidity is seriously reduced rear fender lose (6.1.1 (b) (ii)) | 1 |
| Offside Front Motorcycle structure joining/attachment plate or fastening insecure hand gaurd (6.1.1 (b) (i)) | 1 |
| Stop lamp not working (4.3.1 (a) (ii)) | 1 |
| Offside Rear All direction indicators not working (4.4.1 (a) (ii)) | 1 |
| Stop lamp does not illuminate immediately a brake applies (1.3.1a) | 1 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 1 |
| Exhaust has a major leak of exhaust gases downpipe to header pipe (6.1.2 (a)) | 1 |
| Rear Brake excessively binding (1.2.1 (f)) | 1 |
| Nearside Rear Drive chain excessively loose rubbing on centre stand (6.1.7 (c) (i)) | 1 |
| Stop lamp remains on when the brakes are released | 1 |
| Front Brake excessively binding (1.2.1 (f)) | 1 |
| Drive chain excessively tight has a tight spot/is worn (6.1.7 (k) (i)) | 1 |
| Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 1 |
| Rear Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 1 |
| Drive chain horseshoe locking device incorrectly fitted Missing (6.1.7 (j) (i)) | 1 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 1 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 1 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 1 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 1 |
| Nearside Rear Wheel bearing has excessive play SPROCKET CARRIER BEARING NEEDS REPLACING (5.1.3 (a) (i)) | 1 |
| Offside Front Brake disc contaminated (1.1.14 (b)) | 1 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 1 |
| Rear Valve stem seriously misaligned (5.2.3 (j)) | 1 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 1 |