NEWS APR.2019: v7.9 software is out there for many years now and has help a lot of DIYselfer. To continue to maintain the quality and allow improvements while developing others products as V9 wireless AC-CDI, CDI tester and soon TCI versions, I have chosen to switch V7.9 software into a paid product. A free trial version is available for download in the Shop section. CHARACTERISTICS. Adaptable to other single-cylinder .