I have a 2010 Yz 450 that is somewhat hard to start. It takes about 5-10 kicks when it is cold and close to 20 when it is warm. When it first starts up when cold it tends to die if I do not rev it. Once the bike is running, it runs great. I am not very mechanically knowledgable so I was curious what may be causing this. I was going to take it in to have the valves adjusted but I wanted to see if there may be something else causing this. I didn't want to take it in to have the valves adjusted then have to take it back if it is something else when they maybe could fix it all at once. Any input would be appreciated!