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Message: [QUOTE="marklb, post: 101148, member: 19411"] I am breaking mine in and having a similar problem. I also have a yzf250 and once it was broken in it starts right up and it works great. Here is my dael. I am in Phoenix at about 1500ft. I have a yosh pipe w/ stock main, lowered the needle 1 clip and am fussing w/ the fuel screw. I went up to 3500 ft and it did not like to run good at 300rpm so try lowering the needle 1 clip. My problem is the hesitation at idle and right above idle, do you have this? I can't tell if it is rich or lean. I am also getting fuel from the overflow so I will ck the float level. I would suggest the needle move first! let me know if you are having any of the same problems! Thx Marklb [/QUOTE]