Need some help
 

I've been out of racing for awhile due to a back injury. Have racing go kart that I want to sell. Great kart, but downsizing and need to sell. I've gotten questions about current racing engine rules for dirt tracks. My motor is 5HP briggs and stratton raptor IKF legal back in 2009. Is the engine good now for racing? How much should I ask for this type of engine? It has been reconditioned and never raced and I have another engine that has 1 race on it after being reconditioned. I'm not trying to get a bunch of money, but I would like to get a fair price. However, I need to sell the go kart and all the parts. Any advice would be helpful. Please help.