| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 65 |
| Drive chain excessively loose |6.2.1d| | 34 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 28 |
| Drive chain worn to excess |6.2.1e| | 23 |
| Registration plate issues | 20 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 19 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 12 |
| Horn not working |1.7.3a| | 12 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 11 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 10 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 10 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 10 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 9 |
| Rear reflector on motorcycle missing |1.4.1| | 9 |
| Registration plate lamp issues | 8 |
| Handlebar deformed |2.1.1b| | 8 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 8 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 8 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 7 |
| Nearside Rear Footrest missing |6.2.1a| | 6 |
| Offside Rear Footrest missing |6.2.1a| | 6 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 6 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 6 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 5 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 5 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 5 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 5 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Headlamp insecure |1.2.3b| | 4 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Rear Footrest missing |6.2.1a| | 4 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 4 |
| Stop lamp remains on when the brakes are released | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Rear Wheel bearing has excessive play |5.1.3 |a| |i|| | 3 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 3 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 3 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Front wheel bearings have excessive free play |2.3.5b| | 3 |
| Direction indicator not working |1.5.1c| | 3 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 3 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 3 |
| Rear Brake excessively binding (1.2.1 (f)) | 3 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 3 |
| Throttle operating incorrectly |6.2.1f| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Nearside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Front Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 3 |
| Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Front Brake excessively binding (1.2.1 (f)) | 3 |
| Rear Drive chain excessively loose |6.2.1d| | 3 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 3 |
| Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 2 |
| Rear Brake disc|s| cracked |3.2.A1g| | 2 |
| Offside Rear Direction indicator insecure |1.5.3b| | 2 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 2 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Headlamp aim not tested (4.1.2 (b)) | 2 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 2 |
| Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Rear suspension fouling which affects the movement of the rear suspension |2.4.A.3a| | 2 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 2 |
| Rear wheel spindle loose |2.4.A.2b| | 2 |
| Front Brake fluid contaminated (1.8 (a)) | 2 |
| Front Brake caliper|s| insecure |3.2.A1j| | 2 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 2 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 2 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 2 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 2 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 2 |
| Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Rear Footrest missing (6.2.12 (a)) | 2 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 2 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 2 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 2 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Front Brake lever is so short that the brake cannot be readily applied (1.1.2 (d)) | 2 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Clutch lever shortened so it cannot be readily operated. |6.2.1g| | 2 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 2 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Front Wheel bearing has excessive play |5.1.3 |a| |i|| | 2 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Brake pedal cannot be released smoothly |3.1.3d| | 2 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 2 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Horn not working (7.7 (a) (ii)) | 2 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 2 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 2 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 2 |
| Front position lamp incorrect colour |1.1.2a| | 2 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 2 |
| Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 2 |
| Rear Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 2 |
| Direction indicators not working |1.5.1c| | 2 |