We offer replacement CDI modules for the classic Yamaha Sno-Sport 125. The original Yamaha CDI box, part number 87A-85540-00-00, was discontinued a few years ago, so we worked with an electronics specialist in the US and developed this replacement. Our replacement module uses a digital processor that is programmed to provide a timing curve identical to the original and is made using Japanese and American electrical Components. These CDI boxes fit both kickstart-only and electric start 1990-1991 Yamaha Sno-Sport 125 models. Please be aware that as the housing has a slightly different shape than the original, you may have to fasten it to the frame in a different location.