I am in the process of changing the head gasket on a 98 lakota 300a. I bought a top end gasket kit from rocky mountain and I am trying to put it back together the manual says to put the 3 orings on. The problem is only 2 came with the kit. When I took it apart I did not notice any o rings. Please help

 

I called a local atv dealer and they said they did not see any orings on the microfiche so I said the hell with it and put it back together. I also read that I have to break it in. Any tips on what not to do. The manual said not to go over half throttle for 10 hours. While it was apart I noticed a lot of deposits on the valves and a little on the piston crown. Will I be doing this again soon?