| Most common failures | No# failures |
|---|
| Steering headbearing has excessive free play |2.2.2| | 19 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 16 |
| Headlamp aim out of alignment | 14 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 14 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 13 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 12 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 12 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 11 |
| Horn not working |1.7.3a| | 11 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 10 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 10 |
| Throttle operating incorrectly |6.2.1f| | 6 |
| Riders seat insecure |6.2.1a| | 6 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 5 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 4 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Front Steering headbearing has excessive free play |2.2.2| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Registration plate issues | 4 |
| Headlamp dipped beam affected by the operation of the horn |1.2.2c| | 3 |
| Nearside Steering lock stop ineffective |2.1.3| | 3 |
| Front wheel bearings are excessively rough |2.3.5b| | 3 |
| Front Horn not working |1.7.3a| | 3 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Front position lamp adversely affected by the operation of the horn |1.1.3b| | 3 |
| Handlebar mounting clamp loose |2.1.1a| | 3 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 2 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 2 |
| Headlamp main beam affected by the operation of the horn |1.2.2c| | 2 |
| Stop lamp affected by the operation of the horn |1.3.2| | 2 |
| Front position lamp insecure |1.1.1c| | 2 |
| Front wheel spindle loose |2.3.3a| | 2 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 2 |
| Front wheel bearings have excessive free play |2.3.5b| | 2 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 2 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 2 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 2 |
| Rear shock absorber insecurely mounted |2.4.A.3b| | 2 |
| Front Handlebar mounting clamp loose |2.1.1a| | 2 |
| Offside Steering lock stop ineffective |2.1.3| | 2 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 2 |
| Front Dipswitch does not extinquish main beam/s, leaving at least 1 dipped beam headlamp |1.2.2b|i|| | 2 |
| Rear Built up wheel has a bolt/s missing |4.2.1c| | 2 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 2 |
| Fuel pipe leaking |7.2.1a| | 2 |
| Brake hose excessively deteriorated | 2 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Floor brake test Neither brake control achieves an efficiency of 25% |3.3.C1b| | 2 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 1 |
| Rear Rear suspension movement is excessively stiff |2.4.A.3b| | 1 |
| Plate brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.B2b| | 1 |
| Front Lower Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 1 |
| Front Rear reflector on motorcycle missing |1.4.1| | 1 |
| Headlamp aim not tested |1.6| | 1 |
| Rear Rear wheel has a loose wheel nut|s| |4.2.3a| | 1 |
| Rear position lamp insecure |1.1.1c| | 1 |
| Steering control handlebar movement restricted by taut cables |2.1.2c| | 1 |
| Front Gradient brake test indicates a binding brake |3.3.D1c| | 1 |
| Rear Gradient brake test indicates a severely juddering brake |3.3.D1d| | 1 |
| Rear Gradient brake test indicates a binding brake |3.3.D1c| | 1 |
| Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 1 |
| Headlamp incorrect colour |1.2.1| | 1 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 1 |
| All position lamps do not illuminate immediately when switched on unable to test lights/stop lights and horn |1.1.3a| | 1 |
| Exhaust noise is clearly in excess of that emitted by a similar motor bicycle fitted with a standard silencer in average condition unable to test |7.1.2| | 1 |
| Front suspension assembly has excessive free play in the pivot bearings. |2.3.2| | 1 |
| Front wheel spindle securing nut|s| loose |2.3.5a| | 1 |
| 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| | 1 |
| Rear Rear suspension component seized |2.4A2a|ii|| | 1 |
| Front Throttle operating incorrectly |6.2.1f| | 1 |
| Rear Front wheel spindle securing nut|s| loose |2.3.5a| | 1 |
| Front Fuel hose leaking |7.2.1a| | 1 |
| Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 1 |
| Rear Brake locking device insecure |3.2.A1e| | 1 |
| Rear wheel insecure |4.2.3b| | 1 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 1 |
| Front Fuel pipe leaking |7.2.1a| | 1 |
| Offside Handlebar handgrip missing |2.1.1c| | 1 |
| Rear suspension component loose |2.4.A.1a| | 1 |
| Rear suspension bush excessively deteriorated |2.4.A2a|i|| | 1 |
| Rear reflector on motorcycle missing |1.4.1| | 1 |
| Centre Front Brake drum|s| friction surface contaminated by oil or grease |3.2.A1k| | 1 |
| Headlamp aim beam image kick up to the offside |1.6| | 1 |
| Front Horn not loud enough to be heard by another road user |1.7.3a| | 1 |
| Rear Brake pedal insecure |3.1.2a| | 1 |
| Front Steering movement excessively stiff with the wheel raised |2.2.1b| | 1 |
| Front Front suspension spring worn and seriously weakened |2.3.2b| | 1 |
| Front Brake drum|s| insecure |3.2.A1g| | 1 |
| Exhaust mounting missing |7.1.1c| | 1 |
| Front Built up wheel has a loose bolt/s |4.2.1c| | 1 |
| Brake pedal has insufficient reserve travel |1.1.2 |a|| | 1 |
| Throttle operating incorrectly |6.2.7 |a| |i|| | 1 |
| Headlamp insecure |1.2.3b| | 1 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Fuel system component insecure |7.2.1b| | 1 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 1 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 1 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Front All position lamps adversely affected by the operation of the horn |1.1.3b| | 1 |
| Rear Rear position lamp adversely affected by the operation of the horn |1.1.3b| | 1 |
| Front Horn control defective |1.7.2a| | 1 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 1 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 1 |
| Front Front position lamp incorrect colour |1.1.2a| | 1 |
| Nearside Front Front suspension assembly component loose damper lower bush insecure repair |2.3.1| | 1 |
| Rear Built up wheel has a loose bolt/s |4.2.1c| | 1 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 1 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Rear Brake pivot excessively corroded |1.1.15 |b|| | 1 |
| Front Floor brake test indicates a severely grabbing brake |3.3.C2d| | 1 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 1 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Fuel hose leaking |7.2.1a| | 1 |
| Front Brake lever pivots excessively worn |3.1.3a| | 1 |
| Rear wheel spindle securing nut locking device insecure |2.4.A.2b| | 1 |
| Rear Stop lamp affected by the operation of another lamp |1.3.2| | 1 |
| Front Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 1 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 1 |
| Floor brake test No brake control achieves an efficiency of 30%. |3.3.C1a| | 1 |
| Rear Position lamp not working |4.2.1 |a|| | 1 |
| Offside Front Front suspension assembly component cracked snapped |2.3.1| | 1 |
| Brake lever is inoperative |3.1.3c| | 1 |
| Fuel cap missing |7.2.2a| | 1 |
| Front Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Horn control not functioning. |1.7.2b| | 1 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 1 |
| Front Brake excessively binding (1.2.1 (f)) | 1 |