Just a thought...aren't all HO engines recommended to use XD100, I also have an 08 250 HOinstalled 12/07 and have had all the injectors replaced, 5 at one time under warranty way back in 09, so far 420 + hrs and no mechanical problems. I now run ethanol free gas but from day one have used XD100 and double filter/ water separate my fuel with Moeller manifold and filter with sight glass bottom and add 16 oz of Seafoam to every 16 gal of fuel. I believe keeping all trash out of the fuel is key to 2 stroke EFI engines.