Vibration in fourth gear

[Rickhinnz]

I've just purchased a 95 1100 Sport and am slightly worried by the noticeable vibration in fourth gear. The is a slight vibration in fifth but no where near as bad. First to third are fine. Any ideas as to what I should be looking at?

Thanks in advance.

[voncrump]

Check the condition of the driveshaft and make sure the trunions are aligned. Drop out the gearbox oil and check the magnet for excess build up of metal particles ( you always find a little bit of metal on the magnet) but a big furry deposit spells trouble. You could also check obvious things like wheel balance. Also listen for an extra loud whine in those gears. Good luck, Voncrump