I can't get my 06 yz250 to start it's always been the rock. About two months ago I took it apart to swap the top end it was running fine no issues. Upon inspection the corner of the one intake port flaked a little bit in the corner was the original plating. So sent it off to power seal fresh plating looks good. New wiseco piston even replaced the reed petals with oem. I'm getting spark I'm getting fuel but it won't even pop a little bit. Took carb off and cleaned it out good again. Tried a couple different spark plugs compression feels excellent. I didn't mess with the jets they are stock I rebuilt it completely only two years ago crank and bottom end are good. I took out the plug and kicked it over and I was getting some smoke out of the silencer. I feel like it's acting like fuel starving but there's plenty of fuel in the carb and nothing was blocked. Gonna check a few more simple things to test. Kind of bummed first time the rock has let me down since I bought it new in 05.