can anybody help ive put new o ring and bush and seal behinde front sproket. put it all back together great a thought untill i had it running noticed it was still leaking. so i cheked were the oil was coming from. looks like its leaking behinede the felt pad so i give bultaco uk a ring and asked for there addvice. he said its the seal in the shaft i didnt know there was a seal there. so i got one tryed to put it in just want to know how fare in should it go in?

You do not say what year the bike is?

If you post this may be able to advise

On that model there is a seal on the end of the gear

The shaft has two needle roller bearings on it, and these run inside the sleeve gear