Anyone can help with advice on C15 . I recently bought a BSA C15 scrambles. I was misinformed as to the Gearbox oil capacity , thinking it 3/4 pint rather than 1/2 pint. This caused the oil seal from the gearbox to the small chain case sprocket to blow. I am unsure how I can get to this oil seal , from the timing /gearbox side or the primary chain case side ? A disaster. Any help appreciated.