As many of you know I was having problems with my YS 63. Before getting through the first gallon of 20/20 the engine began to idle erratically and it would always die when I cranked the throttle. I just got it back from YS today. They did not charge me a cent, and on the invoice they said they replaced the plunger. Now, I lost my parts list for this engine and I wanted to know exactly what this plunger thing is. Is this a common point of failure?
Joel