The cold starting problems that it seems some polaris' have is exactly why I bought the new 500 EFI. I sold our trailbosses because they were always hard to start and in AZ it doesn't really get that cold. With the new EFI machines they start sweet every time and our friends that still have the trailbosses still struggle to get them started and keep them running until they are up to temp. I have also found that running a little gas stabilizer in each tank full helped a whole lot on the starting problems that we used to have.