| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 19 |
| Rear reflector on motorcycle missing |1.4.1| | 11 |
| Rear reflector missing (4.8.2 (a) (ii)) | 10 |
| Rear reflector missing |4.8.2 |a| |ii|| | 9 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 7 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 6 |
| Registration plate lamp issues | 6 |
| Registration plate issues | 6 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 6 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 5 |
| Drive chain excessively loose |6.2.1d| | 5 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 4 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Drive chain worn to excess |6.2.1e| | 3 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 3 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Rear Brake fluid reservoir fluid level significantly below minimum level |1.1.10 |d| |ii|| | 2 |
| Rear reflector on motorcycle obscured |1.4.2b| | 2 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Rear Position lamp not working (4.2.1 (a)) | 2 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| All direction indicators not working (4.4.1 (a) (ii)) | 2 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Headlamp insecure (4.1.1 (c)) | 2 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 2 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 2 |
| Offside Rear Footrest missing (6.2.12 (a)) | 2 |
| Rear Lower Shock absorber has an excessively worn bush (5.3.2 (c)) | 2 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 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 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| All position lamps not working (4.2.1 (a)) | 2 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 2 |
| Front Wheel bearing play so excessive it is likely to break up |5.1.3 |a| |ii|| | 2 |
| Rear Brake caliper insecure |1.1.16 |c| |i|| | 2 |
| Rear Wheel bearing has excessive play |5.1.3 |a| |i|| | 2 |
| Rear Brake disc significantly and obviously worn |1.1.14 |a| |i|| | 2 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 2 |
| Horn not working (7.7 (a) (ii)) | 2 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 2 |
| Nearside Front Direction indicators not working |1.5.1c| | 2 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Rear Brake hose leaking |1.1.12 |c|| | 1 |
| Front Wheel fixing loose (multiple fixings) (5.2.1 (a) (i)) | 1 |
| Nearside Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 1 |
| Rear Position lamp not working |4.2.1 |a|| | 1 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 1 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 1 |
| Fork yoke modification unsafe (2.2.2 (e)) | 1 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 1 |
| Handlebar deformed to the extent that steering is affected (2.2.1 (c) (ii)) | 1 |
| Front Brake lever is so short that the brake cannot be readily applied (1.1.2 (d)) | 1 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 1 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 1 |
| Front Headlamp aim not tested (4.1.2 (b)) | 1 |
| Brake performance not tested (1.2.1 (g)) | 1 |
| Stop lamp remains on when the brakes are released | 1 |
| Rear Brake excessively binding (1.2.1 (f)) | 1 |
| Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 1 |
| Rear Brake disc contaminated (1.1.14 (b)) | 1 |
| Front Brake disc contaminated (1.1.14 (b)) | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 1 |
| Nearside Rear All direction indicators not working (4.4.1 (a) (ii)) | 1 |
| Stop lamp not working Flickering on and off (4.3.1 (a) (ii)) | 1 |
| Rear Drive chain sprocket so loose it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Brake rod insecure On rear brake master cylinder |1.1.15 |c|| | 1 |
| Front Shock absorber has negligible damping effect (5.3.2 (b)) | 1 |
| Offside Front Shock absorber has an excessively worn bush (5.3.2 (c)) | 1 |
| Throttle operating incorrectly |6.2.1f| | 1 |
| Front Drive chain sprocket carrier worn to excess |6.2.1e| | 1 |
| Stop lamp not working foot |4.3.1 |a| |ii|| | 1 |
| Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 1 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 1 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 1 |
| Rear reflector likely to become detached (4.8.1 (b) (ii)) | 1 |
| Rear Position lamp switch does not illuminate all position lamps with a single operation (4.2.2 (a)) | 1 |
| Rear Position lamp switch allows the rear position lamp to be switched off when the headlamp(s) are on (4.2.2 (a)) | 1 |
| Rear Position lamp switch does not operate in accordance with the requirements (4.2.2 (a)) | 1 |
| Throttle control functioning such that safe operation of the motorcycle is adversely affected (6.2.7 (a) (ii)) | 1 |
| Stop lamp does not illuminate immediately a brake applies hand |1.3.1a| | 1 |
| Brake lever cracked |3.1.2c| | 1 |
| Rear Lower Rear suspension bush has excessive free play shock |2.4.A2a|i|| | 1 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Suspension component pin or bush excessively worn bottom shock |5.3.4 |a| |i|| | 1 |
| Steering headbearing in such a condition that steering control is adversely affected headrace notchy |2.2.2 |f| |ii|| | 1 |
| Nearside Rear Direction indicators not working missing
|1.5.1c| | 1 |
| Offside Rear Direction indicators not working |1.5.1c| | 1 |
| Headlamp insecure |1.2.3b| | 1 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Offside Front Direction indicators not working |1.5.1c| | 1 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 1 |
| Front Headlamp not working on main beam (4.1.1 (a) (ii)) | 1 |
| All position lamps not working Front and rear (4.2.1 (a)) | 1 |
| Nearside Fairings insecure and likely to impede the steering |2.1.2e| | 1 |
| Front Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 1 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 1 |
| Rear Lower Shock absorber has an excessively worn bush |5.3.2 |c|| | 1 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 1 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 1 |
| Handlebar deformed to the extent that steering is affected |2.2.1 |c| |ii|| | 1 |
| Throttle operating incorrectly not idling |6.2.7 |a| |i|| | 1 |
| Rear Brake master cylinder insecurely mounted |3.2.B1a| | 1 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 1 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 1 |
| Front Brake caliper insecurely mounted and braking performance affected (1.1.16 (c) (ii)) | 1 |
| Front Wheel spindle locking device missing (5.2.1 (d)) | 1 |
| Handlebar deformed handle bars bent |2.1.1b| | 1 |
| Horn not working (7.7 (a)) | 1 |
| Rear Footrest missing both |6.2.12 |a|| | 1 |
| Fuel pipe leaking |7.2.1a| | 1 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 1 |
| Throttle operating incorrectly Sticking. |6.2.1f| | 1 |
| Drive chain excessively tight |6.2.1d| | 1 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride Split link fitted incorrect direction of travel. |6.2.1h| | 1 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Nearside Rear Direction indicator not working |1.5.1c| | 1 |
| Front position lamp missing |1.1.1a| | 1 |
| Front Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 1 |
| Nearside Front Forks excessively deformed |2.2.2 |d| |i|| | 1 |
| Offside Forks excessively deformed |2.2.2 |d| |i|| | 1 |
| Offside Rear Brake component insecure master cylinder hose insecure |1.1.21 |c|| | 1 |
| Rear Brake fluid reservoir fluid level significantly below minimum level (1.1.10 (d) (ii)) | 1 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 1 |
| Direction indicators flashing more than 120 times per minute all |1.5.1c| | 1 |
| Front Steering headbearing has excessive wear or free play upper and lower |2.2.2 |f| |i|| | 1 |
| Rear Drive chain excessively loose |6.1.7 |c| |i|| | 1 |
| Rear Brake component inadequately mounted |1.1.21 |c|| | 1 |
| Offside Rear Direction indicator not working |4.4.1 |a| |ii|| | 1 |
| Rear Brake caliper insecurely mounted and braking performance affected |1.1.16 |c| |ii|| | 1 |
| Wheel alignment incorrect which adversely affects the handling |2.4 |a|| | 1 |
| Brake performance not tested rear caliper loose and rubbing on disc |1.2.1 |g|| | 1 |
| Rear brake disc in such a condition that it is seriously weakened | 1 |
| Rear Brake caliper inadequately mounted |1.1.16 |c| |i|| | 1 |
| Rear Position lamp adversely affected by the operation of another lamp flashes with indicators |4.2.3 |b|| | 1 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 1 |
| Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking side stand |6.1.1c| | 1 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 1 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 1 |
| Rear Footrest missing (6.2.12 (a)) | 1 |
| Front Position lamp not working (4.2.1 (a)) | 1 |
| Headlamp aim not tested (4.1.2 (b)) | 1 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 1 |
| Stop lamp not working on any control (4.3.1 (a) (ii)) | 1 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Drive chain sprocket worn to excess Both |6.2.1e| | 1 |
| Offside Front Direction indicator not working |1.5.1c| | 1 |
| Dipswitch does not operate immediately when selected on main beam |4.1.3 |b|| | 1 |
| Position lamp missing |4.2.1 |a|| | 1 |
| Drive chain excessively tight |6.1.7 |k| |i|| | 1 |
| Drive chain horseshoe locking device incorrectly fitted |6.1.7 |j| |i|| | 1 |
| Offside Front Indicator switch does not operate the direction indicators on the side selected |1.5.4| | 1 |
| Rear Drive chain excessively loose |6.2.1d| | 1 |
| Nearside Rear Direction indicator missing (4.4.1 (a) (ii)) | 1 |
| Exhaust has a major leak of exhaust gases front pipe |6.1.2 |a|| | 1 |
| Exhaust silencer likely to become detached front rubber mount broken |8.1.1 |b| |ii|| | 1 |
| Drive chain sprocket worn to excess both front and rear |6.1.7 |c| |i|| | 1 |
| Rear Brake pedal not releasing correctly and functionality of brakes affected return spring broken |1.1.2 |b| |ii|| | 1 |
| Handlebar excessively deformed (2.2.1 (c) (i)) | 1 |
| Front Brake fluid contaminated (1.8 (a)) | 1 |
| Rear Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 1 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 1 |
| Front Brake grabbing severely (1.2.1 (c)) | 1 |
| Stop lamp does not illuminate immediately a brake applies Front brake. |1.3.1a| | 1 |
| Nearside Front Direction indicator not working |4.4.1 |a| |ii|| | 1 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Horn not working |1.7.3a| | 1 |
| Front Wheel bearing has excessive play |5.1.3 |a| |i|| | 1 |
| Position lamp not working Rear bulb blown. (4.2.1 (a)) | 1 |
| Handlebar mounting clamp loose |2.1.1a| | 1 |
| Front Brake master cylinder insecurely mounted |3.2.B1a| | 1 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Throttle operating incorrectly Sticking |6.2.1f| | 1 |
| Rear Drive chain excessively loose (6.1.7 (c) (i)) | 1 |
| Front Position lamp likely to become detached (4.2.1 (c) (ii)) | 1 |