Have been using this 149F for five years now. It has always started on 1 or 2 pulls, always idled smooth as silk, and accelerated well for a .49cc 4 banger. When I pulled into the driveway yesterday I noticed it was idling erratically. I tried adjusting the carb, no dice. Flew into mechanic mode and adjusted valves, cleaned carb jets, pulled flywheel to make sure it hadn't sheared the pin and slipped timing, and changed plug. Nothing, NADA. Since this old girl has pulled my fat ass around for five long years I'm thinking something has worn out. First I thought it might be the cam, but after checking a diagram found out it's metal. Then I noticed that the timing gear is plastic- ahah! Anyone had one of these to go on them? How did you engine act when it did? Thanks for any help.