| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 599 |
| Registration plate issues | 148 |
| Drive chain excessively loose |6.2.1d| | 138 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 105 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 96 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 90 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 84 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 82 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 77 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 74 |
| Front wheel bearings have excessive free play |2.3.5b| | 73 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 62 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 62 |
| Rear reflector on motorcycle missing |1.4.1| | 62 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 61 |
| Drive chain worn to excess |6.2.1e| | 59 |
| Headlamp aim beam image kick up to the offside |1.6| | 58 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 54 |
| Nearside Front Footrest insecure |6.2.1a| | 52 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 50 |
| Offside Front Footrest insecure |6.2.1a| | 45 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 44 |
| Front wheel bearings are excessively rough |2.3.5b| | 44 |
| Exhaust excessively deteriorated |7.1.1a| | 35 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 33 |
| Rear Hydraulic brake control feels spongy |3.1.4a| | 33 |
| Drive chain excessively tight |6.2.1d| | 32 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 31 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 29 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 28 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 28 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 27 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 25 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 24 |
| 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| | 24 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 24 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 23 |
| Throttle operating incorrectly |6.2.1f| | 22 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 22 |
| Fuel system component insecure |7.2.1b| | 22 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 21 |
| Rear Drive chain excessively loose |6.2.1d| | 20 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 20 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 19 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 19 |
| Steering headbearing has excessive free play |2.2.2| | 19 |
| Horn not working |1.7.3a| | 19 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 18 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 18 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 18 |
| Offside Headlamp aim beam image kick up to the offside |1.6| | 17 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 17 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 17 |
| Nearside Footrest insecure |6.2.1a| | 16 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 16 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 16 |
| Rear Brake disc|s| cracked |3.2.A1g| | 15 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 15 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 15 |
| Handlebar deformed |2.1.1b| | 15 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Offside Front Direction indicator insecure |1.5.3b| | 14 |
| Nearside Rear Direction indicator not working |1.5.1c| | 14 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 13 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 13 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 13 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 12 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 12 |
| Stop lamp remains on when the brake is released |1.3.1e| | 12 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 12 |
| Rear Brake excessively binding (1.2.1 (f)) | 12 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 12 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 12 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 12 |
| Front Position lamp not working (4.2.1 (a)) | 12 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 12 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 12 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 11 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 11 |
| Front Position lamp not working |4.2.1 |a|| | 10 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 10 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 10 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 10 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 10 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 10 |
| Rear reflector missing (4.8.2 (a) (ii)) | 10 |
| Rear Drive chain worn to excess |6.2.1e| | 10 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 9 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 9 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 9 |
| Nearside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 9 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 9 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 9 |
| Rear Position lamp not working |4.2.1 |a|| | 9 |
| Front Brake excessively binding (1.2.1 (f)) | 9 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 9 |
| Chain guard insecure |6.2.1c| | 9 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 9 |