| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 109 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 87 |
| Drive chain excessively loose |6.2.1d| | 70 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 67 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 60 |
| Steering headbearing has excessive free play |2.2.2| | 53 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 49 |
| Drive chain worn to excess |6.2.1e| | 36 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 34 |
| Registration plate issues | 33 |
| Front wheel bearings have excessive free play |2.3.5b| | 32 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 27 |
| Nearside Handlebar mounting clamp bolt loose |2.1.1a| | 27 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 24 |
| Riders seat insecure |6.2.1a| | 23 |
| Nearside Front Direction indicator not working |1.5.1c| | 20 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 20 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 19 |
| Offside Handlebar mounting clamp bolt loose |2.1.1a| | 19 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 19 |
| Drive chain excessively tight |6.2.1d| | 18 |
| Nearside Rear Footrest missing |6.2.1a| | 18 |
| Offside Rear Footrest missing |6.2.1a| | 17 |
| Throttle operating incorrectly |6.2.1f| | 15 |
| Front wheel bearings are excessively rough |2.3.5b| | 15 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 15 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 14 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 13 |
| Rear Footrest missing |6.2.1a| | 13 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 13 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 13 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 13 |
| Rear reflector on motorcycle missing |1.4.1| | 13 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 13 |
| Nearside Front Direction indicators not working |1.5.1c| | 12 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 11 |
| Offside Front Direction indicators not working |1.5.1c| | 11 |
| Nearside Handlebar mounting clamp loose |2.1.1a| | 11 |
| Indicator switch insecure |1.5.4| | 11 |
| Rear Drive chain excessively loose |6.2.1d| | 11 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Brake hose damaged | 11 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 10 |
| Fuel system component leaking |7.2.1a| | 9 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 9 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 9 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 9 |
| Horn not working |1.7.3a| | 8 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 8 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 7 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 7 |
| Offside Front Direction indicator not working |1.5.1c| | 7 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 7 |
| Offside Handlebar deformed |2.1.1b| | 6 |
| Headlamp aim not tested |1.6| | 6 |
| Exhaust mounting missing |7.1.1c| | 6 |
| Brake pedal pivots excessively worn |3.1.3a| | 6 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 6 |
| Headlamp insecure |1.2.3b| | 6 |
| Offside Rear Direction indicator not working |1.5.1c| | 6 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 6 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 6 |
| An item not tested |Manual| | 5 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Drive chain fouling another component |6.2.1d| | 5 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 5 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 5 |
| Front Steering headbearing has excessive free play |2.2.2| | 5 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 5 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 5 |
| Steering control handlebar movement restricted by taut cables |2.1.2c| | 5 |
| Lower Rear suspension bush has excessive free play |2.4.A2a|i|| | 5 |
| 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| | 5 |
| Footrest missing |6.2.1a| | 5 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 5 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Offside Rear Direction indicator insecure |1.5.3b| | 4 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 4 |
| Fuel system component insecure |7.2.1b| | 4 |
| Rear Brake caliper|s| securing bolt|s| missing |3.2.A1j| | 4 |
| Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Offside Front Direction indicator missing |1.5.1a| | 4 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 4 |
| Front mudguard insecure |2.3.7| | 4 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 4 |
| Rear Brake pedal is damaged and the brake cannot be readily applied |3.1.3c| | 4 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 4 |
| Nearside Front Direction indicator insecure |1.5.3b| | 4 |
| Offside Front Direction indicator insecure |1.5.3b| | 4 |
| Direction indicators not working |1.5.1c| | 4 |
| Handlebar deformed |2.1.1b| | 4 |
| Rear Drive chain worn to excess |6.2.1e| | 4 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Rear Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 4 |
| Front Brake lever insecure |3.1.2a| | 4 |
| Offside Handlebar mounting clamp loose |2.1.1a| | 4 |
| Direction indicator not working |1.5.1c| | 4 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 3 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 3 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 3 |
| Headlamp aim beam image kick up to the offside |1.6| | 3 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Position lamp switch insecure |1.1.4b| | 3 |
| Nearside Rear Drive chain worn to excess |6.2.1e| | 3 |
| Nearside Rear Direction indicators not working |1.5.1c| | 3 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Rear suspension component loose |2.4.A.1a| | 3 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 3 |
| Offside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 3 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 3 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 3 |
| Clutch lever positioned so it cannot be readily operated. |6.2.1g| | 3 |
| Direction indicator flashing less than 60 times a minute |1.5.1c| | 3 |
| Handlebar mounting clamp loose |2.1.1a| | 3 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 3 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 3 |
| Nearside Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Rear position lamp insecure |1.1.1c| | 3 |
| Chain guard insecure |6.2.1c| | 3 |
| Front Handlebar mounting clamp loose |2.1.1a| | 3 |
| Rear Brake pedal insecure |3.1.2a| | 3 |
| Offside Rear Direction indicators not working |1.5.1c| | 3 |
| Rear Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 3 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 3 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 3 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 3 |
| Rear Brake pedal pivots excessively worn |3.1.3a| | 3 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Nearside Rear Direction indicator not working |1.5.1c| | 3 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 2 |
| Offside Front Fairings insecure and likely to impede the steering |2.1.2e| | 2 |
| Front Direction indicator insecure |1.5.3b| | 2 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Rear Exhaust mounting missing |7.1.1c| | 2 |
| Front Horn not working |1.7.3a| | 2 |
| Offside Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Nearside Rear Drive chain excessively tight |6.2.1d| | 2 |
| Rear Stop lamp missing |1.3.3a| | 2 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 2 |
| Offside Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 2 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 2 |
| Rear Drive chain fouling another component |6.2.1d| | 2 |
| Nearside Leg shield insecure and likely to impede the steering |2.1.2e| | 2 |
| Rear Brake caliper|s| securing bolt|s| loose |3.2.A1j| | 2 |
| Nearside Front Direction indicator damaged and function impaired |1.5.3a| | 2 |
| Rear position lamp damaged and function impaired |1.1.1b| | 2 |
| Steering movement excessively rough with the wheel raised |2.2.1b| | 2 |
| Brake lever is positioned so that the brake cannot be readily applied |3.1.3c| | 2 |
| Brake lever insecure |3.1.2a| | 2 |
| Front wheel spindle securing nut|s| loose |2.3.5a| | 2 |
| Front Brake hose fouling |3.2.B3b| | 2 |
| Headlamp switch insecure |1.2.4| | 2 |
| Front Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 2 |
| Front Riders seat insecure |6.2.1a| | 2 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 2 |
| Front position lamp incorrect colour |1.1.2a| | 2 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Centre Rear Upper Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 2 |
| Rear Drive chain excessively tight |6.2.1d| | 2 |
| Nearside Direction indicators not working |1.5.1c| | 2 |
| Offside Direction indicators not working |1.5.1c| | 2 |
| Rear Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Front Direction indicator not working |1.5.1c| | 2 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 2 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Rear Hydraulic brake control feels spongy |3.1.4a| | 2 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 2 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 2 |
| Front Front mudguard insecure |2.3.7| | 2 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Nearside Headlamp switch insecure |1.2.4| | 2 |
| Rear Brake pedal cannot be applied smoothly |3.1.3d| | 2 |
| Upper Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Rear Stop lamp affected by the operation of another lamp |1.3.2| | 2 |
| Brake pedal is so short and the brake cannot be readily applied |3.1.3c| | 2 |
| Front Headlamp insecure |1.2.3b| | 2 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 2 |
| Offside Direction indicator not working |1.5.1c| | 2 |
| Rear Brake pedal is positioned so that the brake cannot be readily applied |3.1.3c| | 2 |
| Nearside Handlebar deformed |2.1.1b| | 2 |
| Nearside Front Handlebar mounting clamp loose |2.1.1a| | 2 |
| Front suspension assembly component loose |2.3.1| | 2 |
| Fairing insecure and likely to impede the steering |2.1.2e| | 2 |
| Brake performance not tested |3.3| | 2 |
| Front Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 2 |
| Offside Front Handlebar deformed |2.1.1b| | 2 |
| Front Brake lever is positioned so that the brake cannot be readily applied |3.1.3c| | 2 |
| Nearside Front Handlebar mounting clamp bolt loose |2.1.1a| | 2 |
| Offside Front Handlebar mounting clamp bolt loose |2.1.1a| | 2 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 2 |
| Offside Indicator tell tale not functioning |1.5.2| | 2 |
| Nearside Footrest insecure |6.2.1a| | 2 |
| Rear wheel rotation likely to be impeded |6.2.1b| | 2 |
| Front Brake disc|s| securing bolt|s| loose |3.2.A1g| | 2 |
| Front suspension has inadequate damping effect. |2.3.6c| | 2 |
| Steering control handlebar movement restricted by cables caught on a projection |2.1.2c| | 2 |
| Front suspension assembly component excessively misaligned |2.3.1| | 2 |
| Rear Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 2 |
| Clutch lever shortened so it cannot be readily operated. |6.2.1g| | 2 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 2 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 2 |
| Horn is not a constant note |1.7.3c| | 2 |
| Rear Brake hose fouling |3.2.B3b| | 2 |
| Centre Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 2 |
| Rear Brake component is severely distorted |3.1.5| | 2 |
| Brake lever mounting insecure |3.1.2a| | 2 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 2 |
| Hydraulic brake control feels spongy |3.1.4a| | 2 |
| Rear Brake linkage has abnormal movement due to maladjustment |3.2.A1i| | 2 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 2 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 2 |