Hi there! GREAT SITE! GREAT SERVICE! I have recently purchased a 1985 CT70 in decent shape (running!). My two boys absolutely love it! I would like to "BEEF UP" the engine. I saw the 85cc big bore kit. The Giannelli exhaust looks nice too! Would I have to do anything else to the engine/crank/transmission? I have sent a few before and after pictures. Looking forward to some customizing during the winter. Thanks again for your GREAT and prompt service!