| Most common failures | No# failures |
|---|
| Rear Position lamp not working (4.2.1 (a)) | 20 |
| Headlamp aim out of alignment | 18 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 10 |
| Registration plate lamp issues | 8 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 8 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 6 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 5 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 5 |
| Front Position lamp not working (4.2.1 (a)) | 5 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 4 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 4 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 4 |
| Horn not working (7.7 (a)) | 4 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Registration plate issues | 3 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 3 |
| Front Brake excessively binding (1.2.1 (f)) | 3 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 3 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 3 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 3 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 3 |
| Rear Brake excessively binding (1.2.1 (f)) | 3 |
| Throttle control functioning such that safe operation of the motorcycle is adversely affected (6.2.7 (a) (ii)) | 3 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 2 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 2 |
| Exhaust system insecure (6.1.2 (a)) | 2 |
| Rear Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 2 |
| Rear Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 2 |
| Rear All position lamps not working (4.2.1 (a)) | 2 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 2 |
| Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Rear Position lamp not working |4.2.1 |a|| | 2 |
| Front Brake master cylinder defective but brake still operating master cylinder sight/inspection glass deteriorated (1.1.10 (b) (i)) | 1 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 1 |
| Front Suspension attachment bracket/mounting insecure (5.3.3 (a) (i)) | 1 |
| Front Position lamp not working Front position lamp not working (4.2.1 (a)) | 1 |
| Headlamp not working on dipped beam Dipped beam not working (4.1.1 (a) (ii)) | 1 |
| Headlamp aim not tested Headlamp aim not tested due to dipped beam not working (4.1.2 (b)) | 1 |
| Wheel alignment incorrect which adversely affects the handling Wheel alignment incorrect (2.4 (a)) | 1 |
| Throttle operating incorrectly Throttle assembly insecure (6.2.7 (a) (i)) | 1 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 1 |
| Front Stop lamp does not illuminate by the operation of both brake controls not operating when front brake applied (4.3.2 (a) (iii)) | 1 |
| Front Headlamp not working on main beam opperates on headlight flash only (4.1.1 (a) (ii)) | 1 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 1 |
| Front Brake master cylinder leaking inspection glass broken (1.1.10 (b) (ii)) | 1 |
| Front Brake lever has insufficient reserve travel (1.1.2 (a)) | 1 |
| Front Brake hose damaged and likely to fail cut in hose (1.1.12 (a)) | 1 |
| Front Stop lamp not working brake light switch faulty (4.3.1 (a) (ii)) | 1 |
| Rear Position lamp likely to become detached (4.2.1 (c) (ii)) | 1 |
| Front All position lamps not working (4.2.1 (a)) | 1 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 1 |
| Rear Brake fluid contaminated (1.8 (a)) | 1 |
| Front Brake fluid contaminated (1.8 (a)) | 1 |
| Nearside Lower Drive chain excessively loose |6.1.7 |c| |i|| | 1 |
| Horn sound not in accordance with requirements (7.7 (c)) | 1 |
| Steering headbearing in such a condition that steering control is adversely affected (2.2.2 (f) (ii)) | 1 |
| Horn not working (7.7 (a) (ii)) | 1 |
| Rear Stop lamp not working all controls (4.3.1 (a) (ii)) | 1 |
| All direction indicators not working (4.4.1 (a) (ii)) | 1 |
| Front Wheel bearing play so excessive that directional control is impaired (5.1.3 (a) (ii)) | 1 |
| Rear Wheel fixing loose (single fixing) (5.2.1 (a) (ii)) | 1 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 1 |
| Rear Brake pedal pivot excessively worn (1.1.1 (b)) | 1 |
| Offside Rear Footrest insecure (6.2.12 (a)) | 1 |
| Rear Brake performance unable to be tested (1.2.1 (g)) | 1 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 1 |
| Front Brake disc significantly and obviously worn |1.1.14 |a| |i|| | 1 |
| Front Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 1 |
| Headlamp light source and lamp not compatible LED bulb fitted (4.1.4 (c)) | 1 |
| Fuel pipe leaking excessively or a risk of fire (6.1.3 (b) (ii)) | 1 |
| Rear Brake disc contaminated (1.1.14 (b)) | 1 |
| Front Stop lamp not working brake switch (4.3.1 (a) (ii)) | 1 |
| Nearside Direction indicator not working (4.4.1 (a) (ii)) | 1 |
| Nearside Rear Lower Shock absorber has negligible damping effect (5.3.2 (b)) | 1 |
| Offside Rear Lower Shock absorber has negligible damping effect (5.3.2 (b)) | 1 |
| All position lamps not working (4.2.1 (a)) | 1 |
| Suspension arm attachment bracket/mounting insecure (5.3.3 (a) (i)) | 1 |
| Rear Wheel bearing play so excessive that directional control is impaired (5.1.3 (a) (ii)) | 1 |
| Front Brake fluid reservoir fluid level significantly below minimum level (1.1.10 (d) (ii)) | 1 |
| Front Drive chain sprocket so worn it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Offside Rear Direction indicator not working |4.4.1 |a| |ii|| | 1 |
| Rear Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 1 |
| Rear Exhaust system insecure (6.1.2 (a)) | 1 |
| Front Stop lamp emits other than a steady red light (4.3.3 (a) (ii)) | 1 |
| Nearside Rear Wheel fixing loose (single fixing) rear spindle adjuster nut loose (5.2.1 (a) (ii)) | 1 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 1 |
| Brake lever is so short that the brake cannot be readily applied (1.1.2 (d)) | 1 |
| Offside Footrest insecure (6.2.12 (a)) | 1 |
| Stop lamp not working when rear brake applied (4.3.1 (a) (ii)) | 1 |
| Direction indicator not working (4.4.1 (a) (ii)) | 1 |
| Stop lamp not working rear foot pedal (4.3.1 (a) (ii)) | 1 |
| Indicator switch inoperative doesnt operate when switched between sides (4.4.2 (a) (ii)) | 1 |
| Rear Upper Engine mounting/bracket excessively loose (6.1.8 (a) (ii)) | 1 |
| Rear Lower Engine mounting/bracket excessively loose (6.1.8 (a) (ii)) | 1 |
| Front Brake master cylinder leaking (1.1.10 (b) (ii)) | 1 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 1 |
| Nearside Rear All direction indicators incorrect colour (4.4.3 (a)) | 1 |
| Front Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 1 |
| Dipswitch does not operate immediately when selected on dipped beam (4.1.3 (b)) | 1 |
| Suspension component pin or bush likely to become detached Swingarm spindle loose (5.3.4 (a) (ii)) | 1 |
| Rear Stop lamp adversely affected by the operation of another lamp (4.3.3 (b)) | 1 |
| Rear Brake linkage has abnormal movement of levers indicating excessive wear or maladjustment lock nut missing on rear brake linkage to cylinder (1.1.15 (f)) | 1 |
| Central Rear Position lamp not working (4.2.1 (a)) | 1 |
| Central Rear Stop lamp not working (4.3.1 (a) (ii)) | 1 |
| Central Front Headlamp not working on main beam (4.1.1 (a) (ii)) | 1 |
| Nearside Handlebar excessively deformed (2.2.1 (c) (i)) | 1 |
| Rear Suspension arm pin or bush excessively worn (5.3.4 (a) (i)) | 1 |
| Nearside Rear All direction indicators not working (4.4.1 (a) (ii)) | 1 |
| Nearside Front Direction indicator obviously incorrectly positioned dim and unable to see at some angles (4.4.3 (a)) | 1 |
| Offside Direction indicator obviously incorrectly positioned dim and unable to see at some angles (4.4.3 (a)) | 1 |
| Nearside Rear Direction indicator obviously incorrectly positioned (4.4.3 (a)) | 1 |
| Offside Rear Direction indicator obviously incorrectly positioned (4.4.3 (a)) | 1 |
| Throttle operating incorrectly sticking on (6.2.7 (a) (i)) | 1 |
| Rear Footrest missing (6.2.12 (a)) | 1 |