| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 31 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 20 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 17 |
| Horn not working |1.7.3a| | 13 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 11 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 10 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 8 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 7 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 6 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 6 |
| Nearside Rear Direction indicator not working |1.5.1c| | 6 |
| Headlamp insecure |1.2.3b| | 6 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 6 |
| Drive chain excessively loose |6.2.1d| | 5 |
| Registration plate issues | 5 |
| Fuel system component leaking |7.2.1a| | 5 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Riders seat insecure |6.2.1a| | 4 |
| Drive chain excessively tight |6.2.1d| | 4 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 4 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Offside Rear Direction indicator not working |1.5.1c| | 4 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 3 |
| Throttle operating incorrectly |6.2.1f| | 3 |
| Front Wheel spoke excessively loose |4.2.1b| | 3 |
| Steering headbearing has excessive free play |2.2.2| | 3 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 3 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 2 |
| Brake locking device missing |3.2.A1e| | 2 |
| Brake hose excessively deteriorated | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Front Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 2 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 2 |
| Front Brake locking device missing |3.2.A1e| | 2 |
| Offside Rear Footrest insecure |6.2.1a| | 2 |
| Nearside Front Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 2 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 2 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 2 |
| Rear Brake locking device missing |3.2.A1e| | 2 |
| Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Front Brake caliper|s| insecure |3.2.A1j| | 2 |
| Nearside Front Direction indicator not working |1.5.1c| | 2 |
| Front Brake pipe likely to be fouled or trapped by moving parts |3.2.B2c| | 2 |
| Nearside Direction indicator not working |1.5.1c| | 2 |
| Offside Direction indicator not working |1.5.1c| | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 2 |
| Rear Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 2 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 2 |
| Nearside Direction indicator flashing more than 120 times per minute |1.5.1c| | 2 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Front Direction indicator not working |1.5.1c| | 2 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 2 |
| Rear Brake back plate|s| insecure |3.2.A1j| | 1 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 1 |
| Rear position lamp deteriorated and function impaired |1.1.1b| | 1 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 1 |
| Footrest missing |6.2.1a| | 1 |
| Nearside Front Direction indicators not working |1.5.1c| | 1 |
| Offside Front Direction indicators not working |1.5.1c| | 1 |
| Offside Rear Direction indicators not working |1.5.1c| | 1 |
| Nearside Rear Direction indicators not working |1.5.1c| | 1 |
| Rear Brake linkage has abnormal movement of levers indicating excessive wear or maladjustment |1.1.15 |f|| | 1 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 1 |
| Exhaust excessively deteriorated holed |7.1.1a| | 1 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 1 |
| Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Rear Exhaust excessively deteriorated |7.1.1a| | 1 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 1 |
| Nearside Front Footrest insecure |6.2.1a| | 1 |
| Indicator switch does not operate the direction indicators on the side selected |1.5.4| | 1 |
| Front suspension assembly component loose |2.3.1| | 1 |
| Headlamp dipped beam flickers when tapped lightly by hand |1.2.2c| | 1 |
| Drive chain worn to excess |6.2.1e| | 1 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 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 NSF, NSR & OSR footpeg retaining clips missing |6.2.1h| | 1 |
| Exhaust has part of the system missing bolt missing from silencer clamp |7.1.1a| | 1 |
| Rear Wheel has an excessively distorted bead rim. |4.2.2| | 1 |
| Rear Position lamp not working |4.2.1 |a|| | 1 |
| Front Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 1 |
| Front Front mudguard insecure |2.3.7| | 1 |
| Front Brake caliper|s| securing bolt|s| missing |3.2.A1j| | 1 |
| Handlebar deformed |2.1.1b| | 1 |
| Front Brake cylinder leaking hydraulic fluid |3.2.B1e| | 1 |
| Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Front Brake lever pivots excessively worn |3.1.3a| | 1 |
| Offside Front Direction indicator damaged and function impaired |1.5.3a| | 1 |
| Rear suspension component excessively corroded. swing arm |2.4.A.1a| | 1 |
| Front Headlamp aim beam image kick-up is to the offside |1.6.1| | 1 |
| Rear Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 1 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 1 |
| Rear Drive chain worn to excess |6.2.1e| | 1 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 1 |
| Offside Front Fairings insecure and likely to impede the steering |2.1.2e| | 1 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 1 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 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 |
| Front Brake pipe inadequately supported |3.2.B2b| | 1 |
| Front Brake pipe excessively damaged |3.2.B2a| | 1 |
| Front Floor brake test indicates a severely grabbing brake |3.3.C2d| | 1 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 1 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 1 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 1 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 1 |
| Rear Wheel spoke excessively loose |4.2.1b| | 1 |
| Headlamp switch faulty |1.2.4| | 1 |
| Front Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 1 |
| Nearside Rear Footrest insecure |6.2.1a| | 1 |
| Front wheel spindle securing nut locking device missing |2.3.5a| | 1 |
| Rear Stop lamp affected by the operation of another lamp |1.3.2| | 1 |
| Offside Front Direction indicator not working |1.5.1c| | 1 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 1 |
| Front Brake hose fouling |3.2.B3b| | 1 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Offside Front Upper Fuel cap sealing washer deteriorated |7.2.2c| | 1 |
| Offside Front Lower Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Nearside Locking devices not correctly fitted which may make the motor bicycle dangerous to ride fork spring retaining cap nut |6.2.1h| | 1 |
| Front wheel spindle loose |2.3.5a| | 1 |
| Offside Indicator tell tale not functioning |1.5.2| | 1 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Outer Front Brake caliper|s| securing bolt|s| loose |3.2.A1j| | 1 |
| Headlamp deteriorated and function impaired |1.2.3a| | 1 |
| Throttle operating incorrectly sticking |6.2.1f| | 1 |
| Brake pedal cannot be released smoothly |3.1.3d| | 1 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 1 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 1 |
| Front Handlebar deformed |2.1.1b| | 1 |
| Nearside Front Direction indicator insecure |1.5.3b| | 1 |
| Offside Front Direction indicator insecure |1.5.3b| | 1 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 1 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 1 |
| Rear Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 1 |
| Offside Direction indicator flashing more than 120 times per minute |1.5.1c| | 1 |
| Centre Front Upper Steering headbearing has excessive free play |2.2.2| | 1 |
| Horn not working (1.7.3a) | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. (3.3.A2b) | 1 |
| Rear Stop lamp affected by the operation of another lamp Brake light and tail light appear to be reverse wired |1.3.2| | 1 |
| Rear reflector on motorcycle deteriorated and function impaired |1.4.2a| | 1 |
| Headlamp aim beam image kick up to the offside |1.6| | 1 |
| Lower Rear shock absorber insecurely mounted |2.4.A.3b| | 1 |
| Rear reflector on motorcycle missing |1.4.1| | 1 |
| Offside Rear Brake locking device missing |3.2.A1e| | 1 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 1 |
| Nearside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 1 |
| Offside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 1 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 1 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 1 |
| Offside Front Hydraulic brake control feels spongy |3.1.4a| | 1 |
| Offside Rear Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Nearside Front Indicator switch defective |1.5.4| | 1 |
| Nearside Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 1 |
| Offside Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 1 |
| Front Hydraulic brake control creeps under load. |3.1.4a| | 1 |
| Offside Steering lock stop ineffective |2.1.3| | 1 |
| Offside Exhaust excessively deteriorated |7.1.1a| | 1 |
| Front position lamp does not illuminate immediately when switched on side light |1.1.3a| | 1 |
| Horn control not functioning. |1.7.2b| | 1 |
| Stop lamp emits other than a steady red light |1.3.1b| | 1 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 1 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Front Fuel system component insecure |7.2.1b| | 1 |
| Front Brake lever cannot be released smoothly |3.1.3d| | 1 |