700cc pistons http://www.hoosracing.com/products.html They fit in the stock sleeves and onto the head with no modifications. I started cleaning the stock pistons and noticed one one was uneven like some of the metal chipped off. I originally thought is was carbon build-up. I could put a 750 kit for $600( which would need a new heavy duty clutch), buy a new stock piston or buy this for $300. For the price it seems like a good deal. I would just need to have a machine shop bore them to the 700cc specs. Any thoughts, or items I have not thought about. I am most worried about cylinder wall thickness anybody no anything about them or someone who has used them.