| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 216 |
| Registration plate lamp issues | 175 |
| Registration plate issues | 166 |
| Rear reflector missing (4.8.2 (a) (ii)) | 105 |
| Rear reflector on motorcycle missing |1.4.1| | 85 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 84 |
| Drive chain excessively loose |6.2.1d| | 68 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 65 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 64 |
| Front Brake excessively binding (1.2.1 (f)) | 47 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 41 |
| Rear reflector missing |4.8.2 |a| |ii|| | 38 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 35 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 31 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 31 |
| Rear Brake excessively binding (1.2.1 (f)) | 30 |
| Drive chain worn to excess |6.2.1e| | 29 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 28 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 27 |
| Horn not working (7.7 (a)) | 26 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 26 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 23 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 22 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 20 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 19 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 19 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 19 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 19 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 18 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 17 |
| Stop lamp not working (4.3.1 (a) (ii)) | 17 |
| 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| | 17 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 16 |
| Horn not working (7.7 (a) (ii)) | 16 |
| Rear Position lamp not working (4.2.1 (a)) | 16 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 15 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 15 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 15 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 14 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 14 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 14 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 14 |
| Stop lamp remains on when the brakes are released | 14 |
| 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)) | 13 |
| 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|| | 13 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 13 |
| Drive chain excessively tight |6.2.1d| | 12 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 12 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 12 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 12 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 12 |
| Offside Rear Footrest missing (6.2.12 (a)) | 11 |
| Horn not working |7.7 |a| |ii|| | 11 |
| Front Brake excessively binding |1.2.1 |f|| | 11 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 11 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 11 |
| Front Shock absorber has negligible damping effect (5.3.2 (b)) | 10 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 10 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 10 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 10 |
| All direction indicators not working (4.4.1 (a) (ii)) | 10 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 10 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 10 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 10 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 10 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 10 |
| Rear Wheel bearing has excessive play |5.1.3 |a| |i|| | 9 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 9 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 9 |
| Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 9 |
| Handlebar fouling on the fuel tank or bodywork on full lock (2.1.4 (b)) | 9 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 9 |
| Rear Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 9 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 9 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 8 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 8 |
| Horn not working |1.7.3a| | 8 |
| Rear Drive chain excessively loose (6.1.7 (c) (i)) | 8 |
| Front Position lamp not working (4.2.1 (a)) | 8 |
| Front Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 8 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 8 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 7 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 7 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 7 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 7 |
| Front Brake grabbing severely (1.2.1 (c)) | 7 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 7 |
| Front Wheel bearing so rough it is likely to overheat or break up (5.1.3 (b) (ii)) | 7 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 7 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 7 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 7 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 7 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 7 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 7 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Rear Position lamp not working |4.2.1 |a|| | 7 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Throttle operating incorrectly |6.2.1f| | 7 |
| Offside Handlebar deformed |2.1.1b| | 7 |
| Front Brake lever has insufficient reserve travel (1.1.2 (a)) | 7 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 7 |