Well, stuff happens. Beautiful day, 60+ degrees, put the stock (no mods yet except for Electronic Ig) RYOBI on the test stand, starts right off, idling a little fast, so adjust needle, got the tach out, ouch, dang, got to ba little more careful, wonder why it started running rough, whats that funny red stuff on my finger. It's tough to type with a splint on my pinky that covers the 10 stiches it took to stop the bleeding. Totally destroyed the end of the 18 X 6-10 TOP FlIGHT. Guess I wll be out of action for awhile. MAMMA says no more until you are well enough to get the garden ready. Anyway, this is a stock engine with 2 narrow rings, The off-white reed valve plate off of a STIHL FS40, stock carb. E-I at 30 degrees. Only reading I got was 6540. More info when the swelling goes down