I am new to this forum and I hope someone can help me. I may sound like a newbie, unfortunately I am though. I have a 1200 that I just cleaned the carb on, got it all put back together correctly I think, because it is running. But, only 2 pistons are firing, I have compression in each piston and each plug has good spark, I am thinking it is not getting gas or maybe air. I am totally lost. Book says I may need to adjust pilot screws, but before I started messing with that job I was hoping someone has had that problem before and could maybe help me out of a hole. Would appreciate any help at all.