Just after I had gone through fuel system and had 8 perfect rides before the big freeride this past weekend my ski took a dump a WOT, idled perfect. At wot for a couple seconds it would shut off like someone yanked the lanyard. Hit the start button and it restarted. It was starving for fuel on high speed carb circuit. Low speed fine because to idle doesn't require much fuel delivery.
After pulling head and carbs. I lost 30 psi in rear cylinder ( 160 mag, 130 pto )
Plug readings didn't match at all. Decided to yank the fuel/water separator out and just go direct into carb with the inline fuel filter and put it all back together, beat the hell out of it and now the plug readings are matching, and it doesn't starve for fuel and shutoff on WOT.
But now I have the engine all apart and ready to redo top end.