Bought a 650 Speed Demon after conferring with BG tech reps for my setup. On fire up, so rich that plugs were fouled after about 35 minutes of run time. OK, rejet down 4 sizes front and rear, replace plugs and try again. Now able to at least set idle mixture, altho the four screws are NOT more than 1/3 out from closed. Another call to BG, snotty S.O.B. who answers says I must have screwed up settings....No, assh*le, it's out of the box except for rejetting. Well, then, you just gotta drill out the airbleeds, don't you? - and make sure the throttle plates are closed front and rear.
My time is kind of limited these days, and tuning any carburetor is a given on any new application. I will get this carb straightened out (with time), but the off-idle stumble is just about bearable right now.
Got many years' experience with airbleed carbs (all 2-stroke Jap bikes used 'em) and plenty of time spent on Holleys too; much misspent youth drag-racing tunnel-rammed Nova.
That you folks were fortunate enough to get one that worked, out of the box, is great but ought not imply that will be the case every time.
