i have a flat spot or a bog when i gas it quick, almost like applying the brake. if i roll the throttle easy it doesn't have the problem and accelerates well and has good top end, no plug fouling.
i have the stock jets and needle position now with the air screw about 2 1/4 turns out. i went up a size on the pilot and main jets but it was too hard to start. (about 10 kicks) i put the stock pilot jet back and it solved the starting problem. i tried moving the needle up and down with the one size larger main jet but no difference. i put the stock main back in, no difference. i have a k&n filter and the stock pipe with a supertrapp muffler with 13 plates. i took a couple out, no better. we ride in the high desert of socal about 2400 - 2800 ft. i don't think the altitude is an issue. according to honda the stock jetting should be fine. i went up on the main because of the exhaust and air filter.
i was told that this was common among four strokes but i'm skeptical.
do i have too many discs in the silencer?