| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 61 |
| Drive chain excessively loose |6.2.1d| | 31 |
| Registration plate lamp issues | 25 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 18 |
| Rear Brake excessively binding (1.2.1 (f)) | 14 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 12 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 12 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 11 |
| Drive chain worn to excess |6.2.1e| | 11 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 10 |
| Registration plate issues | 10 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 8 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 8 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 8 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 7 |
| Steering headbearing has excessive free play |2.2.2| | 7 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 7 |
| Front Position lamp not working (4.2.1 (a)) | 6 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 5 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 5 |
| Nearside Front Direction indicator insecure |1.5.3b| | 5 |
| Front Brake excessively binding (1.2.1 (f)) | 5 |
| Offside Handlebar deformed |2.1.1b| | 5 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Offside Front Direction indicators not working |1.5.1c| | 4 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Offside Front Direction indicator not working |1.5.1c| | 4 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| 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| | 4 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 4 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 4 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Drive chain excessively tight |6.2.1d| | 3 |
| Rear Brake excessively binding |1.2.1 |f|| | 3 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Rear reflector on motorcycle missing |1.4.1| | 3 |
| Rear Drive chain worn to excess |6.2.1e| | 3 |
| Handlebar deformed |2.1.1b| | 3 |
| Front Brake excessively binding |1.2.1 |f|| | 3 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 3 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 3 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 3 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 2 |
| Riders seat insecure (6.2.5 (a) (ii)) | 2 |
| Horn not working |1.7.3a| | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 2 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Steering headbearing in such a condition that steering control is adversely affected |2.2.2 |f| |ii|| | 2 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Offside Front Direction indicator insecure |1.5.3b| | 2 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Stop lamp not working Control 1 |4.3.1 |a| |ii|| | 2 |
| Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 2 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Drive chain so worn it is likely to fail |6.1.7 |c| |ii|| | 2 |
| Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 2 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 2 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Stop lamp not working with rear brake |4.3.1 |a| |ii|| | 2 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 2 |
| Dipswitch does not operate immediately when selected on dipped beam (4.1.3 (b)) | 2 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 2 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 2 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 2 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Riders seat insecure |6.2.1a| | 2 |