| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 26 |
| Drive chain excessively loose |6.2.1d| | 16 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 8 |
| Drive chain worn to excess |6.2.1e| | 5 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 5 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 5 |
| Registration plate issues | 5 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 4 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Drive chain excessively tight |6.2.1d| | 3 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 3 |
| Front Brake excessively binding (1.2.1 (f)) | 3 |
| Registration plate lamp issues | 2 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 2 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 2 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 2 |
| Headlamp aim not tested (4.1.2 (b)) | 2 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| 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 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 2 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 2 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 2 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 2 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 2 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 2 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 2 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 2 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Headlamp light intensity severely reduced |4.1.4 |a|| | 1 |
| Drive chain so worn it is likely to fail |6.1.7 |c| |ii|| | 1 |
| Brake linkage has abnormal movement of levers indicating excessive wear or maladjustment |1.1.15 |f|| | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 1 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 1 |
| Indicator switch insecure unit on handle bar |1.5.4| | 1 |
| Front Brake hose fouling |3.2.B3b| | 1 |
| Position lamp switch does not operate the front and rear position lamps |1.1.4c| | 1 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 1 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 1 |
| Indicator switch insecure |1.5.4| | 1 |
| Brake fluid reservoir leaking hydraulic fluid |3.2.B1e| | 1 |
| Fuel system component insecure |7.2.1b| | 1 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 1 |
| Rear Stop lamp adversely affected by the operation of another lamp (4.3.3 (b)) | 1 |
| Stop lamp light intensity significantly reduced not noticable when rear postion light is illuminated (4.3.3 (a) (ii)) | 1 |
| Rear Brake cable guide defective and affecting operation (1.1.15 (d)) | 1 |
| Rear Brake lagging in operation excessive play in rear pedal /cable (1.2.1 (d)) | 1 |
| Rear reflector missing (4.8.2 (a) (ii)) | 1 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 1 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 1 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 1 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 1 |
| Headlamp switch faulty |1.2.4| | 1 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 1 |
| Front Suspension arm pin or bush excessively worn (5.3.4 (a) (i)) | 1 |
| Drive chain excessively loose (6.2.1d) | 1 |
| Seat insecure Back rest (6.2.1a) | 1 |
| Rear wheel rotation likely to be impeded Side panniers insecure (6.2.1b) | 1 |
| Front Roller brake test indicates a binding brake (3.3.A1a) | 1 |
| Drive chain worn to excess (6.2.1e) | 1 |
| Stop lamp remains on when the brakes are released | 1 |
| Rear Drive chain worn to excess |6.2.1e| | 1 |
| Headlamp not working on dipped beam when handlebars turned (4.1.1 (a) (ii)) | 1 |
| Headlamp not working on main beam when handlebars turned (4.1.1 (a) (ii)) | 1 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Rear Brake excessively binding |1.2.1 |f|| | 1 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 1 |
| Offside Handlebar mounting so insecure that steering is adversely affected |2.2.1 |a| |ii|| | 1 |
| Front Brake excessively binding |1.2.1 |f|| | 1 |
| Throttle operating incorrectly |6.2.7 |a| |i|| | 1 |
| Rear Brake lever has insufficient reserve travel (1.1.2 (a)) | 1 |
| Offside Front Direction indicators not working |1.5.1c| | 1 |
| Front wheel bearings have excessive free play |2.3.5b| | 1 |
| Front Wheel bearing so rough it is likely to overheat or break up (5.1.3 (b) (ii)) | 1 |
| Steering operation restricted in free movement from lock to lock (2.1.4 (c)) | 1 |
| Front Brake caliper insecurely mounted and braking performance affected (1.1.16 (c) (ii)) | 1 |
| Rear Position lamp adversely affected by the operation of another lamp (4.2.3 (b)) | 1 |
| All direction indicators obviously incorrectly positioned (4.4.3 (a)) | 1 |
| Headlamp aim not tested |4.1.2 |b|| | 1 |
| Position lamp switch does not operate in accordance with the requirements |4.2.2 |a|| | 1 |
| Position lamp switch insecure |4.2.2 |b|| | 1 |
| Position lamp switch does not illuminate all position lamps with a single operation |4.2.2 |a|| | 1 |
| Rear Brake master cylinder insecure |1.1.10 |c|| | 1 |
| Rear Brake pedal insecure |1.1.2 |e| |i|| | 1 |
| Stop lamp does not emit a steady light |1.3.1b| | 1 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Front Drive chain sprocket carrier worn to excess |6.2.1e| | 1 |
| Offside Front wheel spindle securing nut locking device missing |2.3.5a| | 1 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 1 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 1 |
| Nearside Direction indicator not working indicator switch faulty deteriorated |4.4.1 |a| |ii|| | 1 |
| Fuel system component leaking tap area |6.1.3 |b| |i|| | 1 |
| Brake hose damaged | 1 |
| Central Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 1 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 1 |
| Handlebar deformed |2.1.1b| | 1 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 1 |
| Position lamp switch insecure (4.2.2 (b)) | 1 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Front Valve stem seriously damaged |5.2.3 |j|| | 1 |
| Horn not working |7.7 |a| |ii|| | 1 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 1 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 1 |
| Nearside Rear Direction indicators not working |1.5.1c| | 1 |
| Centre Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Offside Rear Roller brake test indicates a binding brake |3.3.A1a| | 1 |
| Nearside Front Direction indicator not working |1.5.1c| | 1 |
| Nearside Rear Direction indicator missing |1.5.1a| | 1 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 1 |
| Front Gradient brake test indicates a sticking brake |3.3.D1c| | 1 |
| Rear Stop lamp does not emit a steady light |1.3.1b| | 1 |
| Rear Brake excessively binding (1.2.1 (f)) | 1 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 1 |
| Rear Brake locking device missing |3.2.A1e| | 1 |
| Brake lever has inadequate reserve travel front |3.1.3b| | 1 |
| Brake performance not tested (1.2.1 (g)) | 1 |
| Rear Wheel more than one fixing loose (5.2.1 (a) (ii)) | 1 |
| Offside Front Direction indicator damaged and function impaired |1.5.3a| | 1 |
| Headlamp aim not tested |1.6| | 1 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Rear Brake rod insecure (1.1.15 (c)) | 1 |
| Rear Upper Engine mounting/bracket missing (6.1.8 (a) (ii)) | 1 |
| Nearside Rear Footrest missing |6.2.1a| | 1 |
| Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 1 |
| Rear wheel rotation likely to be impeded chain guard |6.2.1b| | 1 |
| Front Headlamp aim not tested |4.1.2 |b|| | 1 |
| Front Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 1 |
| Front Horn not working |7.7 |a| |ii|| | 1 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 1 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 1 |