I have a 1982 flt with the shovel engine, it is making a loud knocking noise that sounds like its coming from the front cyl. It almost sounds like something is going to blow. It sounds like its not getting oil but it is.. The top end was done 700 miles ago and the lower end was within specs.. When the bike was running the other day the oil dip stick popped out it just pushes in but it shouldnt blow out. Thank you for any info..