need help with rm250 starting problem

I have a 96 RM250 that doesn't want to start cold. The only way is push start down a steep hill.My compression is good. I just rebuilt the top end last year, but I've been having this problem since I bought this bike in 98. I had alot shops tried to figure out the problem, but no one has a clue. :bang: Once the bike gets warmed up it starts with 1 kick. My choke wasn't staying up so I replaced it but didn't solve it. I have a FMF gold fatty pipe & FMF silencer , & a rad valve. And had a couple shops make sure my jetting was right. I'm lost & tired of dealing with this, but can't afford a new bike. PLEASE HELP!!! Steve

Would the jetting affect the start of bike if the bike runs great while it's running? I never foul plugs, and the the bike runs smooth through the gears. When I check my plug it's always dry & cinnomin brown.