08 YZ450F starting issues.


I've got a 2008 YZ450F that i can't get started when its not warmed up. I have had to have friends pull me to get it started. Once its warmed up it will start first kick every time. I have adjusted the valves so they are in spec. Anyone have any suggestions of what to try next?


You are using the choke to cold start it, I imagine, right? 


How does the bike run once you get it running?  In particular, does it respond well to the throttle at or near idle speeds, or does it stumble a lot.


Have you tried giving the throttle 3-4 good twists before staring cold to prime the engine?

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