| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 27 |
| Drive chain excessively loose |6.2.1d| | 21 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 14 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Horn not working |1.7.3a| | 10 |
| Drive chain worn to excess |6.2.1e| | 9 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 9 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 7 |
| Registration plate lamp issues | 6 |
| Rear reflector on motorcycle missing |1.4.1| | 6 |
| Drive chain excessively tight |6.2.1d| | 6 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Horn not working |7.7 |a| |ii|| | 5 |
| Rear reflector missing (4.8.2 (a) (ii)) | 5 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Nearside Front Direction indicators not working |1.5.1c| | 4 |
| Registration plate issues | 4 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 4 |
| Throttle operating incorrectly |6.2.1f| | 3 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Rear Brake pedal is inoperative |3.1.3c| | 3 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 3 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Rear Brake disc fractured (1.1.14 (a) (ii)) | 3 |
| Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 2 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 2 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 2 |
| Front Brake excessively binding (1.2.1 (f)) | 2 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Front Brake excessively binding |1.2.1 |f|| | 2 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 2 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 2 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Horn not working (7.7 (a) (ii)) | 2 |
| Rear Brake fluid significantly below minimum mark (1.1.10 (d) (ii)) | 2 |
| Rear Brake excessively binding (1.2.1 (f)) | 2 |
| Nearside Rear Footrest missing |6.2.1a| | 2 |
| Front Brake caliper insecure (1.1.16 (c) (i)) | 2 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 2 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 2 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 2 |
| Rear Drive chain excessively loose |6.2.1d| | 2 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Nearside Front Direction indicator not working |1.5.1c| | 2 |
| Rear Seat insecure |6.2.1a| | 2 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 2 |
| Riders seat insecure |6.2.1a| | 2 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 2 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 2 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 2 |
| Headlamp switch insecure |1.2.4| | 1 |
| Brake performance not tested |3.3| | 1 |
| Stop lamp not working when operated by rear brake (4.3.1 (a) (ii)) | 1 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Front Horn is not a constant note |1.7.3c| | 1 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 1 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 1 |
| Rear Hydraulic brake control creeps under load. |3.1.4a| | 1 |
| Fuel system component insecure |7.2.1b| | 1 |
| Offside Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 1 |
| Nearside Drive chain excessively loose |6.2.1d| | 1 |
| Offside Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 1 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Front Valve stem seriously damaged |5.2.3 |j|| | 1 |
| Rear Valve stem seriously damaged |5.2.3 |j|| | 1 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 1 |
| Stop lamp not working (4.3.1 (a) (ii)) | 1 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Fork yoke insecure (2.2.2 (d) (i)) | 1 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 1 |
| Front Brake fluid significantly below minimum mark (1.1.10 (d) (ii)) | 1 |
| Centre Rear Rear reflector on motorcycle missing |1.4.1| | 1 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 1 |
| Steering control has Insufficient clearance at full lock affecting the riders operation of the controls clutch cable |2.1.2b| | 1 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 1 |
| Handlebar deformed |2.1.1b| | 1 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 1 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Indicator tell tale not functioning |1.5.2| | 1 |
| Seat insecure |6.2.1a| | 1 |
| Upper Rear suspension bush has excessive free play mono shock mount |2.4.A2a|i|| | 1 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 1 |
| Rear Footrest missing |6.2.12 |a|| | 1 |
| Rear Brake master cylinder insecure (1.1.10 (c)) | 1 |
| Front Brake lever insecure (1.1.2 (e) (i)) | 1 |
| Headlamp insecure (4.1.1 (c)) | 1 |
| Steering operation impeded by a fairing (2.1.4 (e)) | 1 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 1 |
| Brake caliper|s| insecure freeplay in caliper missing a bush |3.2.A1j| | 1 |
| Offside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 1 |
| Nearside Front Floor brake test indicates a binding brake |3.3.C2c| | 1 |
| Centre Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 1 |
| Centre Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 1 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 1 |
| Brake lagging in operation Brake creeping. |1.2.1 |d|| | 1 |
| Stop lamp remains on when the brakes are released | 1 |
| Offside Steering operation fouling on the fuel tank or bodywork on full lock (2.1.4 (b)) | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 1 |
| Front Brake lever insecure |3.1.2a| | 1 |
| Front Direction indicators not working |1.5.1c| | 1 |
| Rear Direction indicators not working |1.5.1c| | 1 |
| Steering headbearing has excessive free play |2.2.2| | 1 |
| Offside Rear Brake component worn and seriously reduced in strength Disc under 3mm |3.2.A1| | 1 |
| Direction indicator flashing more than 120 times per minute Timed over 120 per minute |1.5.1c| | 1 |
| Rear Wheel bearing has excessive play |5.1.3 |a| |i|| | 1 |
| Nearside Rear Wheel bearing has excessive play |5.1.3 |a| |i|| | 1 |
| Offside Rear Wheel bearing has excessive play |5.1.3 |a| |i|| | 1 |
| Headlamp aim not tested (4.1.2 (b)) | 1 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 1 |
| Rear Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 1 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Rear Front mudguard insecure |2.3.7| | 1 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Nearside Front Direction indicator deteriorated and function impaired |1.5.3a| | 1 |
| Rear Brake component leaking fluid |3.2.B4| | 1 |
| Nearside Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Nearside Front Brake linked system has a seized caliper pivot. |3.2.B5| | 1 |
| Nearside Rear Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Fuel tank leaking |7.2.1a| | 1 |
| Offside Rear Footrest missing |6.2.1a| | 1 |
| Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Offside Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Front Brake back plate|s| insecure |3.2.A1j| | 1 |
| Rear Brake performance not tested rear brake not working. (1.2.1 (g)) | 1 |
| Nearside Front Handlebar so insecure it is likely to become detached (2.2.1 (b) (ii)) | 1 |
| Horn sound not in accordance with requirements (7.7 (c)) | 1 |
| Nearside Front Footrest insecure (6.2.12 (a)) | 1 |
| Chain guard insecure (6.1.7 (i)) | 1 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Steering control has Insufficient clearance at full lock affecting the riders operation of the controls |2.1.2b| | 1 |
| Rear Exhaust mounting missing |7.1.1c| | 1 |
| Rear wheel spindle securing nut|s| loose |2.4.A.2b| | 1 |
| Fairings so located that it is likely to impede the steering |2.1.2e| | 1 |
| Offside Rear Direction indicator not working |4.4.1 |a| |ii|| | 1 |
| Front Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Clutch lever positioned so it cannot be readily operated loose |6.2.7 |b|| | 1 |
| Rear Brake disc significantly and obviously worn |1.1.14 |a| |i|| | 1 |
| Roller brake test No brake control achieves an efficiency of 30% |1.2.2 |a| |i|| | 1 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 1 |
| Rear Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 1 |
| Front Headlamp at least one does not illuminate on dipped beam Aftermarket headlamp kit does not function every time it is switched on (1.2.2a(i)) | 1 |
| Lower Rear suspension bush has excessive free play (2.4.A2a(i)) | 1 |
| Horn sounds harsh or grating (1.7.3c) | 1 |
| Rear Stop lamp does not illuminate immediately a brake applies (1.3.1a) | 1 |
| Drive chain excessively loose (6.2.1d) | 1 |
| Rear Roller brake test indicates a binding brake (3.3.A1a) | 1 |
| Dipswitch does not operate immediately when selected on main beam (4.1.3 (b)) | 1 |
| Locking device(s) not correctly fitted which may make the motor bicycle dangerous to ride chain clip fitted backwards (6.2.1h) | 1 |
| Front Horn not working |1.7.3a| | 1 |
| Stop lamp not working rear switch |4.3.1 |a| |ii|| | 1 |
| Exhaust silencer insecure |8.1.1 |b| |i|| | 1 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 1 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 1 |
| Stop lamp does not illuminate immediately a brake applies foot pedal |1.3.1a| | 1 |
| Throttle operating incorrectly hand level loose and sticks on |6.2.1f| | 1 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 1 |
| Offside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 1 |
| Offside Front Direction indicator insecure |1.5.3b| | 1 |
| Offside Rear Direction indicators not working |1.5.1c| | 1 |
| Rear Brake performance not tested |3.3| | 1 |
| Front Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 1 |
| Front Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 1 |
| Offside Front Shock absorber has a serious fluid leak right fork seal |5.3.2 |b|| | 1 |
| Rear Lower Suspension attachment bracket/mounting insecure shock linkage |5.3.3 |a| |i|| | 1 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 1 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 1 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Fuel hose leaking |7.2.1a| | 1 |
| Rear Stop lamp not working Rear brake |4.3.1 |a| |ii|| | 1 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 1 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 1 |
| Steering movement excessively rough with the weight on the lower bearing |2.2.1a| | 1 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Offside Front Direction indicators not working |1.5.1c| | 1 |
| Offside Front Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 1 |
| Rear Brake caliper insecure (1.1.16 (c) (i)) | 1 |
| Rear Brake caliper|s| securing bolt|s| missing Caliper missing |3.2.A1j| | 1 |
| Headlamp aim headlamp damaged and function impaired No beam pattern |1.2.3a| | 1 |
| Headlamp aim headlamp deteriorated and function impaired headlight beam too dim |1.2.3a| | 1 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 1 |
| Front Brake performance not tested |3.3| | 1 |
| Front Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 1 |
| Front Headlamp aim so that beam "kick up" is not visible on the screen |1.6.B.1| | 1 |
| Offside Rear Direction indicators affected by the operation of another lamp |1.5.1c| | 1 |
| Front Headlamp aim not tested |1.6| | 1 |
| Nearside Front Direction indicator missing |1.5.1a| | 1 |
| Front Headlamp switch insecure |1.2.4| | 1 |
| Front Front position lamp insecure |1.1.1c| | 1 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 1 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride split link fitted backwards |6.2.1h| | 1 |
| Headlamp switch faulty |1.2.4| | 1 |
| Rear Brake reaction bracket insecure poor repair on bracket excessive movement |3.2.A1j| | 1 |
| Rear Wheel alignment incorrect which adversely affects the handling o/s back more |2.5.1| | 1 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 1 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Front Wheel alignment incorrect which adversely affects the steering |2.5.1| | 1 |
| Rear Rear suspension movement is excessively stiff |2.4.A.3b| | 1 |
| Rear mono-shock pivot seized |2.4.B.4| | 1 |