Im working on a 2001 arctic cat 300. After it is started it will run fine for 5-20 sec. 5 sec at idle, and around 20 with more throttle, then it starts to stutter and sounds like a two stroke. If I open the throttle too much, it just dies on me. The interesting thing is that if I restart it, it will run fine for another 20 sec.
The trick I have found to get it running like it should, is to open the trottle very slowly over a period of as much as 5 minutes. After that it will run perfect! The air temperature is that of a typical norwegian summer, ie in the 60s. But it shouldnt take THAT long to warm up. lol
The engine is a four stroke, single cylinder, cv carb, electronic ignition. The carb is the keihin cvk32.
Does anyone have an idea what could cause this kind of problems? I have of course taken apart the carb, and cleaned it.