250 250YZ hard to start

Hi I have a 00 250yz I just bought and the only way the guy I got it from could start it was push it,I took the top end apart and piston was blown but cylinder was fine, I replaced it and gaskets and it will start with kick starter now but is really hard to start like it takes a lot of kicking and doesn't matter if its warm or cold but when its running it seems fine! Any thoughts anyone?
 
Yep tried a couple new plugs,I have carb off now and cleaning it to see if that makes a difference?

When you give the carb a good cleaning try the air screw out at 1 1/2 out. Make sure you have brass screw, spring, washer, o-ring when you assemble it back together.
 
Set the float while you are in there. Doing the rest and playing with jetting is a waste of time imo without that. You really need to remove the jets and make sure air is getting through the passages.
 
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