I don't believe they offer an engine exchange through that program for the sportster. However, everything I've looked into suggests that a rebuild can be as much as 2-3 thousand. Depending on how much of a basket case the engine is. If you are in a position to get a new/used bike, I would suggest doing that unless you really love your sporty and want to keep her. If you can't afford a new bike now, then a rebuild is not a bad thing. Now is the time to add some Screamin Eagle parts as long as they have her open. You didnt say if she was an 883, but if so you can upgrade to the 1200 now. Let us know what you decide, and welcome to HDtalking