1978 Arctic cat jag 3000 F/A hard to start. Any reason why?

Hello my arctic cat snowmobile is so hard to start after about 15 to 20 pulls it will fire up. It is really hard to start after its been ran. Please help me!!|||You are probably looking at a rebuild. that is the classic symptom of lower compression in a two stroke engine. At least it isn't that hard or expensive for a two stroker.