I have a Beta 250 rev 3 Trials bike, and there appears to be a problem with the gears. 1st and 2nd are ok, but sometimes when trying to get into 3rd it sticks and will not move. can anyone advise me? Do I need to use some form of gearbox oil? I am new to this and don't really have a clue as you can probably gather!!! Also stuck in the middle of france so getting advice is not too easy!! Thanks in advance

Alors mon Pote tu a bien sur besion de l oil! seriously of course you need oil ther's a little glass sighting level on the clutch case just below the water pump. you need to see oil in there with the motor stopped bike upright on level ground. If there is oil in there it may just be a bit "thin" I recall with rev 3 using automatic transmission fluid for better clutch separation/action and finding the gearbox extremely "notchy" as you'v described. In which case try some oil. There are many and long discussion on this within Beta bike forum. Are you riding Aveyron next month? see you ther if so.