| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 22 |
| Rear reflector on motorcycle missing |1.4.1| | 13 |
| Registration plate lamp issues | 11 |
| Horn not working |7.7 |a| |ii|| | 6 |
| Steering headbearing has excessive free play |2.2.2| | 6 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 5 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 5 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 5 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Drive chain excessively loose |6.2.1d| | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 4 |
| Front Brake excessively binding |1.2.1 |f|| | 3 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 3 |
| Front Position lamp not working |4.2.1 |a|| | 3 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Registration plate issues | 3 |
| Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 3 |
| Horn not working |1.7.3a| | 2 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Nearside Rear Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Offside Rear Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Rear Position lamp not working |4.2.1 |a|| | 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 shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Nearside Rear Direction indicators not working |1.5.1c| | 2 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 2 |
| Rear Shock absorber has negligible damping effect |5.3.2 |b|| | 2 |
| Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 2 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 2 |
| Headlamp aim so that beam "kick up" is not visible on the screen |1.6.B.1| | 2 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 2 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| Rear Suspension component pin or bush excessively worn (5.3.4 (a) (i)) | 2 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Front Position lamp not working (4.2.1 (a)) | 2 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Front Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Rear Suspension arm pin or bush excessively worn (5.3.4 (a) (i)) | 2 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 2 |
| All direction indicators not working (4.4.1 (a) (ii)) | 2 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 2 |
| Front Upper Steering headbearing has excessive free play loose head bearings |2.2.2| | 1 |
| Front Upper Steering headbearing has excessive free play |2.2.2| | 1 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 1 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 1 |
| Rear suspension bush has excessive free play Swing arm |2.4.A2a|i|| | 1 |
| Headlamp aim beam image kick up to the offside |1.6| | 1 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 1 |
| Front wheel spindle loose |2.3.3a| | 1 |
| Rear suspension bush has excessive free play swing arm bearings adversly affecting control of vehicle |2.4.A2a|i|| | 1 |
| Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Drive chain worn to excess |6.2.1e| | 1 |
| Headlamp aim not tested dip beam not working. |1.6| | 1 |
| Front Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 1 |
| Rear Drive chain excessively tight, so that it is likely to fail |6.1.7 |k| |ii|| | 1 |
| Rear suspension bearing has excessive free play nut missing swing arm shaft |2.4.A2a|i|| | 1 |
| Stop lamp emits other than a steady red light on then off as brake applied |1.3.1b| | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 1 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 1 |
| Nearside Rear Footrest missing |6.2.1a| | 1 |
| Front Brake fluid contaminated |1.8 |a|| | 1 |
| Offside Rear Footrest insecure |6.2.12 |a|| | 1 |
| Front Steering headbearing has excessive free play |2.2.2| | 1 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 1 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 1 |
| Rear Brake pedal anti-slip provision missing |1.1.2 |c|| | 1 |
| Rear Brake pedal not releasing correctly and functionality of brakes affected sticks on |1.1.2 |b| |ii|| | 1 |
| Rear Drive chain worn to excess |6.1.7 |c| |i|| | 1 |
| Front Stop lamp damaged and function impaired not working |1.3.3a| | 1 |
| Offside Front Brake hose excessively damaged |1.1.12 |b| |ii|| | 1 |
| Headlamp switch insecure |1.2.4| | 1 |
| Exhaust is leaking and excessively noisey egr return pipe missing |7.1.1b| | 1 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 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 Footrest missing |6.2.1a| | 1 |
| Rear suspension bush has excessive free play swingarm |2.4.A2a|i|| | 1 |
| Brake component insecure |1.1.21 |c|| | 1 |
| Rear position lamp does not illuminate immediately when it is switched on number plate light |1.1.3a| | 1 |
| Front Brake lever is damaged and the brake cannot be readily applied |3.1.3c| | 1 |
| Rear Brake lever mounting insecure |3.1.2a| | 1 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 1 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 1 |
| Rear suspension bush has excessive free play SWINGARM HAS EXCESSIVE FREEPLAY |2.4.A2a|i|| | 1 |
| Headlamp insecure |1.2.3b| | 1 |
| Nearside Rear Direction indicators not working Not flashing |1.5.1c| | 1 |
| Rear position lamp damaged and function impaired |1.1.1b| | 1 |
| Front Brake effort inadequate at a wheel |1.2.1 |a| |i|| | 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 |
| Roller brake test Neither brake control achieves an efficiency of 25% |1.2.2 |a| |i|| | 1 |
| Indicator switch defective |1.5.4| | 1 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 1 |
| Nearside Front Direction indicator damaged and function impaired |1.5.3a| | 1 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 1 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 1 |
| Drive chain sprocket so worn it is likely to fail |6.1.7 |c| |ii|| | 1 |
| Brake lever insecure REAR |3.1.2a| | 1 |
| Front Brake component leaking fluid |3.2.B4| | 1 |
| Exhaust has part of the system missing |7.1.1a| | 1 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Wheel alignment incorrect which adversely affects the handling Swing arm pivot worn |2.5.1| | 1 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 1 |
| Direction indicators affected by the operation of another lamp Affected by horn |1.5.1c| | 1 |
| Exhaust system insecure End can |6.1.2 |a|| | 1 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Stop lamp does not illuminate immediately a brake applies front control |1.3.1a| | 1 |
| Rear Suspension component has excessive wear or free play |5.3.3 |d|| | 1 |
| Rear Suspension component insecure and control of the motorcycle impaired |5.3.3 |a| |ii|| | 1 |
| Drive chain so worn it is likely to fail |6.1.7 |c| |ii|| | 1 |
| Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 1 |
| Steering linkage component insecure to the motorcycle structure |2.1.3 |a| |i|| | 1 |
| Stop lamp remains on when the brakes are released | 1 |
| Rear Upper Position lamp not working |4.2.1 |a|| | 1 |
| Exhaust system insecure |6.1.2 |a|| | 1 |
| Drive chain excessively tight |6.1.7 |k| |i|| | 1 |
| Front Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 1 |
| All direction indicators not working |4.4.1 |a| |ii|| | 1 |
| Rear All direction indicators missing |4.4.1 |a| |ii|| | 1 |
| Stop lamp not working |4.3.1 |a| |ii|| | 1 |
| Headlamp aim not tested |4.1.2 |b|| | 1 |
| Footrest insecure |6.2.12 |a|| | 1 |
| Throttle operating incorrectly |6.2.7 |a| |i|| | 1 |
| Throttle control functioning such that safe operation of the motorcycle is adversely affected |6.2.7 |a| |ii|| | 1 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 1 |
| Suspension arm pin or bush excessively worn |5.3.4 |a| |i|| | 1 |
| Stop lamp not working front brake operation |4.3.1 |a| |ii|| | 1 |
| Brake pedal has insufficient reserve travel |1.1.2 |a|| | 1 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 1 |
| Central Front Wheel alignment incorrect which adversely affects the steering |2.4 |a|| | 1 |
| Drive chain horseshoe locking device incorrectly fitted |6.1.7 |j| |i|| | 1 |
| Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 1 |
| Offside Front Footrest insecure |6.2.12 |a|| | 1 |
| Chain guard insecure |6.1.7 |i|| | 1 |
| Rear Brake reaction bracket excessively worn |1.1.15 |b|| | 1 |
| Drive chain horseshoe locking device likely to become detached |6.1.7 |j| |ii|| | 1 |
| Rear Brake excessively binding |1.2.1 |f|| | 1 |
| Rear suspension component loose swing arm excessive play |2.4.A.1a| | 1 |
| Front Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 1 |
| Nearside Rear Direction indicator lens defective such that the emitted light is adversely affected (4.4.1 (b) (ii)) | 1 |
| Rear Brake cylinder has no reserve travel and braking performance affected (1.1.16 (e) (ii)) | 1 |
| Front Headlamp light source and lamp not compatible (4.1.4 (c)) | 1 |
| Rear All position lamps light intensity significantly reduced (4.2.3 (a) (ii)) | 1 |
| Front All position lamps light intensity significantly reduced (4.2.3 (a) (ii)) | 1 |
| Nearside Rear All direction indicators missing (4.4.1 (a) (ii)) | 1 |
| Offside Rear All direction indicators missing (4.4.1 (a) (ii)) | 1 |
| Rear Stop lamp light intensity significantly reduced (4.3.3 (a) (ii)) | 1 |
| Headlamp light intensity severely reduced (4.1.4 (a)) | 1 |
| Nearside Rear Drive chain sprocket so loose it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Rear Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 1 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 1 |
| Front Drive chain worn to excess (6.1.7 (c) (i)) | 1 |
| Nearside Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Offside Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Nearside Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 1 |
| Offside Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 1 |
| Rear Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 1 |
| Front Brake lever pivot excessively tight (1.1.1 (a)) | 1 |
| Front Brake excessively binding Front wheel binds badly when turned backwards (1.2.1 (f)) | 1 |
| Steering operation restricted in free movement from lock to lock (2.1.4 (c)) | 1 |
| Offside Front Lower Brake cylinder leaking Level glass cracked and leaking fluid (1.1.16 (b) (i)) | 1 |
| Nearside Indicator switch inoperative (4.4.2 (a) (ii)) | 1 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 1 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Front Brake excessively binding (1.2.1 (f)) | 1 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 1 |
| Rear Brake pedal not releasing correctly and functionality of brakes affected (1.1.2 (b) (ii)) | 1 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 1 |
| Rear Brake lining(s) less than 1.0 mm thick (1.1.13 (a)) | 1 |
| Rear Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 1 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 1 |
| Rear Stop lamp adversely affected by the operation of another lamp (4.3.3 (b)) | 1 |
| Rear Position lamp adversely affected by the operation of another lamp (4.2.3 (b)) | 1 |
| Rear Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 1 |
| Nearside Rear Direction indicator obviously incorrectly positioned (4.4.3 (a)) | 1 |
| Rear Wheel spindle or securing nut(s) so insecure that wheel security or steering control is adversely affected wheel support bar (5.2.1 (c) (ii)) | 1 |
| Rear Exhaust system insecure (6.1.2 (a)) | 1 |
| Central Rear Stop lamp not working stop lamp not working correctly on foot pedal (4.3.1 (a) (ii)) | 1 |
| Central Rear Suspension arm pin or bush excessively worn rear swinging arms bushes worn (5.3.4 (a) (i)) | 1 |
| Nearside Rear Drive chain excessively loose chain and sprockets loose and worn (6.1.7 (c) (i)) | 1 |
| Nearside Rear Drive chain sprocket excessively loose rear sprocket cush drive worn (6.1.7 (c) (i)) | 1 |
| Front Stop lamp does not illuminate by the operation of both brake controls Front brake switch inoperative (4.3.2 (a) (iii)) | 1 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 1 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 1 |
| Nearside Rear Brake lever so insecure that the brake cannot be readily applied (1.1.2 (e) (ii)) | 1 |
| Stop lamp not working (4.3.1 (a) (ii)) | 1 |
| Rear Suspension arm insecurely attached Swinging Arm Pivot Bolt excessively loose. (5.3.3 (a) (i)) | 1 |
| Central Rear Lower Suspension arm pin or bush excessively worn swing arm bearing excessive free play. (5.3.4 (a) (i)) | 1 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 1 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 1 |
| Rear Drive chain sprocket excessively loose cush drive (6.1.7 (c) (i)) | 1 |
| Nearside Front Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 1 |
| Offside Rear Direction indicator missing (4.4.1 (a) (ii)) | 1 |
| Front Dipswitch does not operate immediately when selected on dipped beam (4.1.3 (b)) | 1 |
| Front Dipswitch does not operate immediately when selected on main beam (4.1.3 (b)) | 1 |
| All position lamps not working (4.2.1 (a)) | 1 |
| Shock absorber has a serious fluid leak both front forks (5.3.2 (b)) | 1 |
| Nearside Suspension arm pin or bush excessively worn (5.3.4 (a) (i)) | 1 |
| Front Throttle control functioning such that safe operation of the motorcycle is adversely affected (6.2.7 (a) (ii)) | 1 |
| Front Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 1 |
| Central Rear Rear reflector missing (4.8.2 (a) (ii)) | 1 |
| Front Handlebar grip insecure to handlebar Need glueing (2.2.1 (d) (ii)) | 1 |
| Front Brake disc significantly and obviously worn front brake pulsing under load (1.1.14 (a) (i)) | 1 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 1 |
| Front Valve stem seriously damaged split (5.2.3 (j)) | 1 |
| Rear Valve stem seriously damaged split (5.2.3 (j)) | 1 |
| Rear Suspension arm pin or bush excessively worn swinging arm bushes(both) (5.3.4 (a) (i)) | 1 |