'87 CBR600, 20k "easy" mi. CV Keihins. I had to pull carbs, clean pilot jets, etc about 6 weeks ago. Seemed to be running about as good as ever. Added something from an old can of Stabil to gas yesterday. Rode about 12 mi., spent 20 min. in a store, came out, it wouldn't start. Tried 0 throttle, 1/8 throttle, 1/2 throttle, even (very briefly) with 1/3 choke. Stood around thinking about it for 6-8 min., tried full throttle and it shot up to 5k rpm in a flash. Operating conditions were normal. About 68 F. Nothing out of the ordinary about the ride. Same thing used to happen -very- infrequently in previous years: I'm guessing once every 2 seasons. "El Motore'" was flooded? Any notion as to what might've caused it? TIA, Puddin' "Well, there's two trains runnin'. Ain't neither one goin' my way. One run at midnight, the other run just before day." - from "Still A Fool", Muddy Waters, maybe 1949