The stock B6 shock is very wimpy. I put a B12 shock on mine and its worked well. Does well with 2 up riding too as I go very little preload for single riding and crank it up a few for a passenger. You will have to add progressive fork springs to keep things even (you don't want a firm rear with a spongy front end). Someone usually has one for sale on ebay for cheap or run an ad here.