@John1 Just the MOT checker alone gives you quite a lot of details about the history of the bike and how well it's been cared for. It tells you a story about it's life and how the owners have treated her. Such basic things like worn tyres and brake pads suggest she's been ridden hard. Failures for high emissions and excessive smoke suggest lots of high revving and infrequent servicing. Worn chains and sprockets suggest heavy handedness on the throttle. Faulty headlights, indicators, brake lights etc. suggest wiring problems. Parts will naturally wear out over time, but an owner who cherishes their bike will check all of these prior to a test and fix any problems if need be, so that she stands a good chance of passing first time. Regular servicing and spanner-time will tell you how well the bike has been looked after. Also look at the reasons for failure's and the advisory's too, if the same one's reoccur then it's safe to say that the bike has had a hard life.
Try this little test and see for yourself. This is a bike I was looking at today, I was quite shocked when I ran the MOT checker. Just click the link above and enter these details below and you will see why.
Check the MOT history of a vehicle
Registration number: DX56BYO
Vehicle make APRILIA
In comparison enter these details of another bike and you will see a vast difference.
Check the MOT history of a vehicle
Registration number: DX57FXZ
Vehicle make APRILIA
Also check the yearly mileage recorded, the top bike readings are pretty shocking and it looked really good too!!! :O(