ya i rode with a guy from the chopper board who was ridding his sohc chopper when a black cloud came out from his breather and the bike ran really bad.... it wouldnt start easy so i put my hand near the 1-2 cycl and no air was comming out... turned out i called it right his cam shaft was CRACKED in HALF!!!! right at the #2 cam journal
he road home with his old lady on the back and then agin the next day to the bike show.... (per the rules to enter it had to ride down there) then when he went to leave it wouldnt start ( i think the motor was hosed) anyways he going to replace it...
but dang that motor took a beating and still ran on 2... cycl's it was crazy...