Hi and welcome, from memory 550 cc is correct, but I think some people recommend only using 500 cc to give better clutch action. If you check out American Beta (just google it) all the user manuals and workshop manuals you will ever need are available for download.
Have you burped the banjo on the m/c, I had the same thing happen, I could not move any fluid and then I burped the banjo and after that was able to bleed the brake line in the normal way.
Just a quick note, have you replaced the damaged HT lead (spark plug lead) if it has cut into the lead and the conductor is damaged you could get a week spark that will not spark when under compresson.
Use a 20 inch bmx inner inflated so it holds it's shape, place the inner tube in the gap between the tyre bead and the rim so it fill the gap, inflate the tyre and pull the inner tube out as the bead of the tyre reaches the rim of the wheel, this is normally very successfully to get the tyre to seal, once the tyre is holding pressure continue to inflate until the beads seat (please be cautious of over inflating the tyre especially if it has any visible damage)
Alternatively a bead seater is a great investment.
Has the bike been on its side? We used to loose some oil through the breather after a big off. If it was loosing trans oil through the mains it would be smoking enough to hide the section that he was riding. Unless your lad is riding the bike hard all the time you probably have a rear silencer full of unburnt oil that is smoking when the bike gets hot after a long hill climb!
Silly question but you are turning the fuel off while the bike is parked for the week?
Does the tap let by when in the off position?
When the bike starts does it run very fluffy at first?
The bike my flooding if the float needle has a small leak when closed this would also need some other minor carb faults but so minor that the bike could run fine once started.
Water In Gearbox And Other Problems
in Beta
Posted
Silkolene light gear oil every time ++++++