zerks or not, the best way is to put on the dirty pants, get the pan and kero, and get dirty.
pull the wheel, chain, swingarm, the lot out, really clean those hard to get to bits, lube it with really nice grease (think women and moisturiser.....sohc4's are female.......spend accordingly), and put it back together with love and attention.
tits or wheels mate....its an old story