| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 47 |
| Headlamp aim beam image kick up to the offside |1.6| | 13 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 13 |
| Registration plate issues | 12 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 11 |
| Drive chain excessively loose |6.2.1d| | 10 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 9 |
| Registration plate lamp issues | 9 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 7 |
| Horn not working |1.7.3a| | 7 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 6 |
| Throttle operating incorrectly |6.2.1f| | 5 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 5 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Steering headbearing has excessive free play |2.2.2| | 5 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Drive chain excessively tight |6.2.1d| | 4 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 4 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 4 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 4 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Nearside Headlamp aim beam image kick up to the offside |1.6| | 3 |
| Offside Headlamp aim beam image kick up to the offside |1.6| | 3 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Drive chain worn to excess |6.2.1e| | 3 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 3 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |
| Front Headlamp not working on main beam (4.1.1 (a) (ii)) | 3 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 3 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 3 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 3 |
| Front Brake excessively binding (1.2.1 (f)) | 3 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 3 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 2 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Nearside Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Front Headlamp aim beam image kick-up is to the offside |1.6.1| | 2 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 2 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 2 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 2 |
| Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Front Brake excessively binding |1.2.1 |f|| | 2 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front Valve stem seriously damaged |5.2.3 |j|| | 2 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 2 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 2 |
| Central Rear Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 2 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 2 |
| Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 2 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Nearside Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Exhaust has part of the system missing |7.1.1a| | 2 |
| Rear Wheel hub excessively worn (5.2.1 (b) (i)) | 2 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 1 |
| Nearside Rear Direction indicator not working |1.5.1c| | 1 |
| Nearside Rear Direction indicators not working |1.5.1c| | 1 |
| Nearside Front Headlamp aim beam image kick up to the offside |1.6| | 1 |
| Outer Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Front Brake lever mounting insecure |3.1.2a| | 1 |
| Rear Brake disc fractured (1.1.14 (a) (ii)) | 1 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Headlamp switch faulty |1.2.4| | 1 |
| Rear Front mudguard insecure |2.3.7| | 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 |
| Nearside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Stop lamp remains on when the brakes are released | 1 |
| Nearside Footrest missing |6.2.1a| | 1 |
| Stop lamp not working |4.3.1 |a| |ii|| | 1 |
| Nearside Front Footrest insecure (6.2.12 (a)) | 1 |
| Steering operation restricted in free movement from lock to lock (2.1.4 (c)) | 1 |
| Headlamp incorrect colour (4.1.4 (a)) | 1 |
| Rear Brake caliper inadequately mounted (1.1.16 (c) (i)) | 1 |
| Offside Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Rear Brake caliper|s| insecure |3.2.A1j| | 1 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 1 |
| Front Wheel bearing so rough it is likely to overheat or break up (5.1.3 (b) (ii)) | 1 |
| Offside Front Brake caliper insecure (1.1.16 (c) (i)) | 1 |
| Brake pedal is damaged and the brake cannot be readily applied |3.1.3c| | 1 |
| Rear Wheel bearing play so excessive that directional control is impaired (5.1.3 (a) (ii)) | 1 |
| Front Position lamp not working (4.2.1 (a)) | 1 |
| Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Rear Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 1 |
| Centre Rear Lower Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Offside Rear Upper Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Rear Wheel alignment incorrect which adversely affects the steering |2.5.1| | 1 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 1 |
| Central Rear Lower Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 1 |
| 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)) | 1 |
| Nearside Front Upper Rear suspension bearing has excessive free play |2.4.A2a|i|| | 1 |
| Front Horn not loud enough to be heard by another road user |1.7.3a| | 1 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 1 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Exhaust has a major leak of exhaust gases all three exhaust clamps have failed (6.1.2 (a)) | 1 |
| Rear suspension bush has excessive free play linkage |2.4.A2a|i|| | 1 |
| Front Brake performance not tested Front brake calliper locked (1.2.1 (g)) | 1 |
| Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 1 |
| Front Stop lamp does not illuminate immediately a brake applies the front brake light switch is missing |1.3.1a| | 1 |
| Outer Front Upper Headlamp aim beam image kick up to the offside |1.6| | 1 |
| Rear brake disc in such a condition that it is seriously weakened | 1 |
| Rear Valve stem seriously damaged |5.2.3 |j|| | 1 |
| Front Wheel bearing rough when rotated |5.1.3 |b| |i|| | 1 |
| Front Wheel bearing has excessive play |5.1.3 |a| |i|| | 1 |
| Rear Steering movement excessively rough with the wheel raised REAR WHEEL BEARINGS ROUGH |2.2.1b| | 1 |
| Rear Shock absorber has an excessively worn bush (5.3.2 (c)) | 1 |
| Drive chain sprocket so loose it is likely to fail Sprocket Carrier bearing |6.1.7 |c| |ii|| | 1 |
| Headlamp light source and lamp not compatible No discernable beam pattern (4.1.4 (c)) | 1 |
| Offside Front Position lamp not working (4.2.1 (a)) | 1 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 1 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 1 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 1 |
| Lower Rear mono-shock pivot excessively worn |2.4.B.4| | 1 |
| Central Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 1 |
| Front Brake disc significantly and obviously worn Severe warp front brake discs |1.1.14 |a| |i|| | 1 |
| Headlamp at least one does not illuminate on dipped beam not working |1.2.2a|i|| | 1 |
| Front Stop lamp switch with a delay in operation |4.3.2 |a| |ii|| | 1 |
| Rear Brake caliper|s| securing bolt|s| loose |3.2.A1j| | 1 |
| Rear Shock absorber has a serious fluid leak |5.3.2 |b|| | 1 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 1 |
| Brake fluid significantly below minimum mark |1.1.10 |d| |ii|| | 1 |
| Lower Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Rear suspension bearing has excessive free play rear engine side |2.4.A2a|i|| | 1 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 1 |
| Horn not working |7.7 |a| |ii|| | 1 |
| Rear Wheel bearing has excessive play |5.1.3 |a| |i|| | 1 |
| Nearside Rear Outer Wheel bearing play so excessive it is likely to break up sprocket carrier bearing (5.1.3 (a) (ii)) | 1 |
| Offside Front Shock absorber has a serious fluid leak fork seal leaking (5.3.2 (b)) | 1 |
| Offside Exhaust excessively deteriorated |7.1.1a| | 1 |
| Nearside Front Position lamp not working (4.2.1 (a)) | 1 |
| Front Brake excessively binding VERY STIFF AFTER USING THE FRONT BRAKE |1.2.1 |f|| | 1 |
| Front Brake lever cracked |3.1.2c| | 1 |
| Nearside Front Position lamp not working |4.2.1 |a|| | 1 |
| Rear Stop lamp missing |1.3.3a| | 1 |
| Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 1 |
| Headlamp aim not tested |4.1.2 |b|| | 1 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 1 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 1 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 1 |
| Headlamp aim not tested |1.6| | 1 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 1 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 1 |
| Offside Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Offside Front Brake disc|s| excessively worn |3.2.A1l| | 1 |
| Stop lamp emits other than a steady red light |1.3.1b| | 1 |
| Central Front Valve stem seriously damaged replaced perished valve (5.2.3 (j)) | 1 |
| Front Position lamp not working |4.2.1 |a|| | 1 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 1 |
| Nearside Rear Footrest missing will not open (6.2.12 (a)) | 1 |
| Nearside Rear Footrest missing |6.2.12 |a|| | 1 |
| Offside Rear Footrest missing |6.2.12 |a|| | 1 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 1 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 1 |
| Headlamp aim not tested (4.1.2 (b)) | 1 |
| Nearside Front Direction indicator not working |1.5.1c| | 1 |
| Offside Rear Direction indicator not working |1.5.1c| | 1 |
| Floor brake test indicates a sticking brake |3.3.C2c| | 1 |
| Floor brake test indicates a binding brake |3.3.C2c| | 1 |
| Offside Front Brake pipe inadequately supported |3.2.B2b| | 1 |
| Offside Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 1 |
| Rear Brake excessively binding |1.2.1 |f|| | 1 |
| Direction indicators not working |1.5.1c| | 1 |
| Offside Front Direction indicator likely to become detached (4.4.1 (c) (ii)) | 1 |
| Front Brake disc|s| insecure |3.2.A1g| | 1 |
| Front Lower Rear suspension bearing has excessive free play |2.4.A2a|i|| | 1 |
| Front wheel bearings are excessively rough |2.3.5b| | 1 |
| Front wheel bearings have excessive free play |2.3.5b| | 1 |
| Offside Rear Footrest insecure (6.2.12 (a)) | 1 |
| Offside Rear Exhaust silencer insecure (8.1.1 (b) (i)) | 1 |
| Nearside Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Offside Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Nearside Steering lock stop ineffective |2.1.3| | 1 |
| Drive chain excessively tight worn |6.2.1d| | 1 |
| Offside Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Fairings so located that it is likely to impede the steering |2.1.2e| | 1 |
| Rear Brake caliper insecurely mounted and braking performance affected |1.1.16 |c| |ii|| | 1 |
| Offside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Front Stop lamp|s| not working |4.3.1 |a| |ii|| | 1 |
| Front Stop lamp does not emit a steady light |1.3.1b| | 1 |
| Front Brake excessively binding body of caliper fouling on disc---incorrect assembly (1.2.1 (f)) | 1 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 1 |
| Front Drive chain sprocket carrier worn to excess |6.2.1e| | 1 |
| Horn not working (7.7 (a)) | 1 |
| Central Rear Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Lower Rear suspension bearing has excessive free play |2.4.A2a|i|| | 1 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 1 |
| Nearside Rear Footrest missing |6.2.1a| | 1 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 1 |
| Offside Position lamp switch insecure |1.1.4b| | 1 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 1 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 1 |
| Centre Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Offside Front Direction indicator not working |1.5.1c| | 1 |
| Chain guard insecure |6.1.7 |i|| | 1 |
| Front Front mudguard insecure |2.3.7| | 1 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 1 |
| Rear Upper Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Offside Front Direction indicators not working |1.5.1c| | 1 |
| Nearside Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 1 |
| Offside Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 1 |
| Suspension arm ball joint excessively worn |5.3.4 |a| |i|| | 1 |
| Front position lamp does not illuminate immediately when switched on (1.1.3a) | 1 |
| Rear Roller brake test indicates a binding brake (3.3.A1a) | 1 |
| Centre Rear Rear wheel bearings have excessive free play (2.4.A.2c) | 1 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 1 |
| Front Roller brake test indicates a binding brake (3.3.A1a) | 1 |
| Stop lamp not working front brake (4.3.1 (a) (ii)) | 1 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 1 |
| Horn not working (1.7.3a) | 1 |
| Front wheel spindle securing nut locking device insecure (2.3.5a) | 1 |
| Headlamp aim beam image kick up to the offside (1.6) | 1 |
| Centre Rear All position lamps do not illuminate immediately when switched on (1.1.3a) | 1 |
| Rear suspension component seized Rear suspenion linkage seized does not return when compressed |2.4A2a|ii|| | 1 |
| Nearside Rear Outer Rear wheel bearings have excessive free play Rear sprocket carrier bearing has excessive free play |2.4.A.2c| | 1 |
| Offside Headlamp not working on dipped beam Reconnected headlamp. (4.1.1 (a) (ii)) | 1 |