Does anyone know what cleanfire injection is? Is it like Ski Doo's SDI?

Simular to sdi. They used it on their watercraft for a couple of years. Works really well and clean burning. Better than going to a four stroke.

It's similar to SDI, but the injection points are different and they're oriented about the cylinder differently. The way Polaris pulls it off does not require nearly the pressure of the Doo system so it doesn't need the heavy duty compressors the Doos have. This is in no way related to the Ficht injection they used on their watercraft. Ficht is true DFI. SDI/CFI is not.