| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 154 |
| Drive chain excessively loose |6.2.1d| | 103 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 101 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 55 |
| Drive chain worn to excess |6.2.1e| | 54 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 52 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 44 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 44 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 42 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 42 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 41 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 32 |
| Horn not working |1.7.3a| | 31 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 30 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 28 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 26 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 25 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 25 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 24 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 23 |
| Registration plate issues | 21 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 21 |
| Steering headbearing has excessive free play |2.2.2| | 21 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 19 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 19 |
| Handlebar deformed |2.1.1b| | 18 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 17 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 17 |
| Throttle operating incorrectly |6.2.1f| | 17 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 16 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 16 |
| Drive chain excessively tight |6.2.1d| | 16 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 14 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 14 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Offside Rear Footrest missing |6.2.1a| | 13 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 13 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 13 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 13 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 13 |
| Rear Drive chain excessively loose |6.2.1d| | 12 |
| Headlamp aim beam image kick up to the offside |1.6| | 12 |
| Nearside Rear Footrest missing |6.2.1a| | 12 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 12 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 12 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 11 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 11 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 10 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Front wheel bearings have excessive free play |2.3.5b| | 10 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 10 |
| Stop lamp remains on when the brake is released |1.3.1e| | 9 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 9 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 9 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 9 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 9 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 9 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 9 |
| Front Brake excessively binding (1.2.1 (f)) | 9 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 8 |
| Rear reflector on motorcycle missing |1.4.1| | 8 |
| Front Plate brake test indicates a binding brake |3.3.B1a| | 8 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 8 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 8 |
| Headlamp switch faulty |1.2.4| | 8 |
| Front position lamp incorrect colour |1.1.2a| | 8 |
| Nearside Front position lamp does not illuminate immediately when switched on |1.1.3a| | 8 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 8 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 8 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 8 |
| Front Brake disc|s| is excessively distorted |3.2.A1m| | 7 |
| Nearside Steering lock stop ineffective |2.1.3| | 7 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 7 |
| Exhaust excessively deteriorated |7.1.1a| | 7 |
| Dipswitch does not deflect the main beam/s, making them into dipped beam/s |1.2.2b|ii|| | 7 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 7 |
| Offside Rear Footrest missing (6.2.12 (a)) | 7 |
| Brake lever has inadequate reserve travel |3.1.3b| | 6 |
| Dipswitch does not extinquish main beam/s, leaving at least 1 dipped beam headlamp |1.2.2b|i|| | 6 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 6 |
| Steering control has Insufficient clearance at full lock affecting the riders operation of the controls |2.1.2b| | 6 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 6 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 6 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 6 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 6 |
| Rear Drive chain worn to excess |6.2.1e| | 6 |
| Rear Brake excessively binding (1.2.1 (f)) | 6 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 6 |
| Front Roller brake test indicates a severely juddering brake |3.3.A1b| | 5 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 5 |
| Chain guard insecure |6.2.1c| | 5 |
| Front Brake excessively binding |1.2.1 |f|| | 5 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 5 |
| Front Steering headbearing has excessive free play |2.2.2| | 5 |
| Front Horn not working |1.7.3a| | 5 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 5 |
| Front Handlebar deformed |2.1.1b| | 5 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 5 |
| Rear Brake disc|s| cracked |3.2.A1g| | 5 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 5 |
| Rear reflector missing (4.8.2 (a) (ii)) | 5 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 4 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Nearside Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Headlamp aim not tested |1.6| | 4 |
| Rear Brake hose which buldges |3.2.B4| | 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 |
| An item not tested |Manual| | 4 |
| Offside Steering lock stop ineffective |2.1.3| | 4 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 4 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 4 |
| Offside Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Front Fairings insecure and likely to impede the steering |2.1.2e| | 4 |
| Offside Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Nearside Footrest insecure |6.2.1a| | 4 |
| Rear Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 4 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 4 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 4 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 4 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| All direction indicators not working (4.4.1 (a) (ii)) | 4 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 4 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 4 |
| Rear Position lamp not working (4.2.1 (a)) | 4 |