Post by CrankingWithCG on Jul 10, 2020 21:56:39 GMT -5
After much trial and error on my built 155, ive been still having trouble with my low speed sruff. I went down from a 48 pilot to a 38. With the bigger pilots, i thought it was running lean due to an idle that would either sit at 2500rpm, or idle down and die if i turned the idle down any. Apparently it was way too fat, and it HAD to idle that high to keep itself running. Oops
On the 38, i still have a strange miss if i snap the throttle open really hard if i hold it. Its sitting with the air screw about a turn to a turn and a half out. Its on the air side, so turning in cuts air, turning out adds air. Idle doing that same not going low without dying thing, though theres a little more wiggle room with how low itll go. Its not a hanging idle that eventually settles back down, it comes down to 2500-2900 rpms. Itll occasionally drop to 1800, but goes back up. I raised the needle up a clip to try and get at least the bog to go away, but now it spits and sputters until about half throttle. Going out on the air screw doesnt make the idle go up, and going in makes it drop.
Its a 155 bbk with a hand ported head, valve springs, A9 cam, hand "mostly straightpiped" exhaust, aluminum intake, and a 28mm Keihin slide carb. Im just confused. Too big on the pilot still?
On the 38, i still have a strange miss if i snap the throttle open really hard if i hold it. Its sitting with the air screw about a turn to a turn and a half out. Its on the air side, so turning in cuts air, turning out adds air. Idle doing that same not going low without dying thing, though theres a little more wiggle room with how low itll go. Its not a hanging idle that eventually settles back down, it comes down to 2500-2900 rpms. Itll occasionally drop to 1800, but goes back up. I raised the needle up a clip to try and get at least the bog to go away, but now it spits and sputters until about half throttle. Going out on the air screw doesnt make the idle go up, and going in makes it drop.
Its a 155 bbk with a hand ported head, valve springs, A9 cam, hand "mostly straightpiped" exhaust, aluminum intake, and a 28mm Keihin slide carb. Im just confused. Too big on the pilot still?