RE: I am breaking in my savage...but...
When I read your thrend, your problem sounds like your engine is loading up, is that the s-25, I have s-25 on my raptor and savage. is the engine die after giving a punch, if its then try to lean your low side 1/8 turn, thats the one on the side of your carbs. I adjusted mine as it also loads-up after I ilde it for a an estimate 5 second, some times what i do on a warming -up procedure i pinch the line time to time that goes to the carb when i feel its loading -up.