About 4lts of oil
Just googled it and it should be 3.7lts
Did you buy it from a shop or private, I'll assume private. I would have given it back to the bloke and told him give me a call when it was fixed.
The breather for the engine will probably be in the air box and overfilling with oil can cause some blowback.
Now you have it, you should do an oil change ensuring you put the correct amount in. Buy a manual if you don't have one already. You can even download them of t'internet and hope you haven't blown any seals.
Oh and stick an intro into the new members section. You'll get a better response that way