I was riding my xp not too long ago with it running great until I hit a small wave and it bogged down to 3k at wot. I rebuilt the carbs, to full stock settings, new 2.0 need and seat, 115 gram spring. I'm waiting for new high speed adj needles now cause the boosters where dripping. I redid the rotary timing again and have it set. Both cyl have 150 psi in each. My problem now is the ski has a lack of power out of the hole and will clime to 5k and slowly run to 6k . any ideas?! I'm starting to think timing? thanks Mike, oh this engine is fresh, maybe 5 hours on it