| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 141 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 131 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 122 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 113 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 107 |
| Registration plate issues | 68 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 52 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 45 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 43 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 37 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 36 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 34 |
| Horn not working |1.7.3a| | 34 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 31 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 29 |
| Stop lamp remains on when the brake is released |1.3.1e| | 28 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 26 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 24 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 24 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 23 |
| Headlamp insecure |1.2.3b| | 22 |
| Steering headbearing has excessive free play |2.2.2| | 21 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 21 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 20 |
| Rear reflector on motorcycle missing |1.4.1| | 19 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 19 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 19 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 18 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 18 |
| Throttle operating incorrectly |6.2.1f| | 18 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 17 |
| 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| | 16 |
| Direction indicators not working |1.5.1c| | 15 |
| Headlamp aim not tested |1.6| | 15 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 14 |
| Front Fairings insecure and likely to impede the steering |2.1.2e| | 13 |
| Riders seat insecure |6.2.1a| | 13 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 12 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 12 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 12 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 11 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 10 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 10 |
| Rear position lamp incorrect colour |1.1.2b| | 10 |
| Rear Brake locking device missing |3.2.A1e| | 10 |
| Front wheel bearings have excessive free play |2.3.5b| | 10 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 9 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 9 |
| Direction indicator not working |1.5.1c| | 9 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 9 |
| Rear Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 8 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 8 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 8 |
| Front wheel bearings are excessively rough |2.3.5b| | 8 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 8 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 8 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 7 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 7 |
| Front Brake disc|s| excessively scored |3.2.A1l| | 7 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 7 |
| Front Steering headbearing has excessive free play |2.2.2| | 7 |
| Front position lamp incorrect colour |1.1.2a| | 7 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 7 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 7 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 7 |
| Front mudguard insecure |2.3.7| | 7 |
| Nearside Rear Direction indicator not working |1.5.1c| | 6 |
| Indicator tell tale not functioning |1.5.2| | 6 |
| Handlebar deformed |2.1.1b| | 6 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 6 |
| Stop lamp remains on when the brakes are released | 5 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 5 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 5 |
| Rear Stop lamp affected by the operation of another lamp |1.3.2| | 5 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 5 |
| Offside Front Direction indicators not working |1.5.1c| | 5 |
| Offside Front Direction indicator not working |1.5.1c| | 5 |
| Rear Direction indicator incorrect colour |1.5.1b| | 5 |
| Front Headlamp insecure |1.2.3b| | 5 |
| Front Wheel alignment incorrect which adversely affects the steering |2.5.1| | 5 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 5 |
| Stop lamp emits other than a steady red light |1.3.1b| | 5 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 5 |
| Exhaust excessively deteriorated |7.1.1a| | 5 |
| Rear suspension component loose |2.4.A.1a| | 5 |
| Horn sounds harsh or grating |1.7.3c| | 5 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 5 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Nearside Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 5 |
| Front Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 5 |
| Front suspension has inadequate damping effect. |2.3.6c| | 5 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 5 |
| Headlamp aim beam image kick up to the offside |1.6| | 4 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Rear Direction indicator not working |1.5.1c| | 4 |
| Nearside Front Direction indicators not working |1.5.1c| | 4 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 4 |
| Nearside Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Rear Stop lamp deteriorated and function impaired |1.3.3a| | 4 |
| Headlamp dipped beam flickers when tapped lightly by hand |1.2.2c| | 4 |
| Front Direction indicator flashing less than 60 times a minute |1.5.1c| | 4 |
| Front Direction indicator insecure |1.5.3b| | 4 |
| Horn is not a constant note |1.7.3c| | 4 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 4 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 4 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 4 |
| Rear position lamp insecure |1.1.1c| | 4 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 4 |
| Nearside Front Direction indicator missing |1.5.1a| | 4 |
| Offside Front Direction indicator missing |1.5.1a| | 4 |
| Front Brake disc|s| is excessively distorted |3.2.A1m| | 4 |
| Headlamp switch faulty |1.2.4| | 4 |
| Horn is not continous or uniform |1.7.3c| | 3 |
| Front Brake locking device missing |3.2.A1e| | 3 |
| Rear Brake fluid reservoir leaking hydraulic fluid |3.2.B1e| | 3 |
| Front Brake lever attachment screws loose |3.1.2b| | 3 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 3 |
| Rear Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Offside Rear Direction indicators not working |1.5.1c| | 3 |
| Exhaust mounting missing |7.1.1c| | 3 |
| Dipswitch does not deflect the main beam/s, making them into dipped beam/s |1.2.2b|ii|| | 3 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 3 |
| Direction indicator affected by the operation of another lamp |1.5.1c| | 3 |
| Rear Brake disc|s| is excessively distorted |3.2.A1m| | 3 |
| Offside Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Lower Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Rear Direction indicator flashing less than 60 times a minute |1.5.1c| | 3 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 3 |
| Front Horn not working |1.7.3a| | 3 |
| Front suspension assembly component excessively bent |2.3.1| | 3 |
| Front Horn not loud enough to be heard by another road user |1.7.3a| | 3 |
| Rear Brake caliper|s| insecure |3.2.A1j| | 3 |
| Fuel cap does not fasten securely by a positive means |7.2.2b| | 3 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Rear Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Offside Rear Direction indicator not working |4.4.1 |a| |ii|| | 3 |
| Front Lower Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Rear position lamp deteriorated and function impaired |1.1.1b| | 3 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 3 |
| Front Direction indicator incorrect colour |1.5.1b| | 3 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Nearside Front Direction indicator not working |1.5.1c| | 3 |
| Rear Position lamp not working |4.2.1 |a|| | 3 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Registration plate lamp issues | 3 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 3 |