Polaris has determined the fuel pump sender units on all 2005 & 2006 big block 755 & 866 (700 & 900 Cleanfire models) can deteriorate. The deterioration can allow small particles to contaminate the fuel system, including the fuel filter and injectors. This could cause reduced performance, and/or engine damage.
Polaris has developed kits to remedy this situation. All models get a new fuel pump sender unit, and some models get a new fuel filter as well. Owners of these machines should have the appropriate kit installed to prevent fuel system contamination.