Alright,

I just (last week) picked up a new to me Superhawk.

I noticed this morning riding to work that if I am cruising along at a steady 2000-3500rpm (town traffic, putting along in 1st or 2nd) it starts to run rough. almost feels like it is backfiring through the carbs. (feel the tank jump a little with the hiccup.)

I will be going along at a steady pace (no accel or decel) at a steady rpm. and it will be nice and smooth and then start to kick. If I change the speed it goes fine.

Any ideas? I have no fear of diggin into the carbs so any suggestions would be great.

 

+1 me too i usually have it happen when i am just starting out. once everything is warm it is fine.

 

Ya know, from what I have gathered it is just a side-effect of the v-twin with those two big carbs on them. It sounds all too common and just one of those things you have to deal with in exchange for the high torque that comes with the SuperHawk.
Welcome to the forum. Enjoy the Hawk!

 

Hmmm bike was definatley not completely warm yet. and considering it was ~45 degrees when I left for work this morning that would explain it. maybe I unchoked it a little to early

 

I usually have to set the choke in two steps in the mornings to avoid those hiccups...

 

Regarding the 2500-3500 stumble: Do you all have pipes and stock jetting? If so, shimming the carb needles will solve it. If you have a jet kit, then raising the needles up a slot does the same thing. If it only happens right after start up and dead cold, you just need to choke it longer.

 

Yeah it seems this is a thing that happens on this bike. I know if I sit there and blip the throttle, every so often I'll get a backfire kind of thing happen thru the front carb. Could be a slight jetting issue I suppose but the bike has ZERO hiccups, stumbles, hesitation, etc when actually riding it (putting around or flogging the **** out of it). It only does it on mine I'd say 3 times out of oh....maybe 30 "blips" of the throttle. Not that I'm blipping it that many times sitting on the bike at a red light or anything. I mean in total over the course of a day, or sometimes it doesn't do it at all for the entire day but then once the next following day. I think temps and the "right conditions" make mine do it. Who knows LOL. All I know is she runs like a champ!

I'll try and rtead up on some more threads and see if it's a normal trait of the SH. I'm not worried about it but I guess it's just one of those things kinda like the stalling out coming to a stop thing for others. Mine hasn't personally stalled (crosses fingers) but I read its best just to not coast to a stop.

Jon87yj, do a search on here using "backfire". You'll find 2 pages of good info. From backfires thru the exhaust, from the carbs, or back into the airbox. Numerous things cause it for one thing or the other but it seems most all come from a jetting or PAIR issue. I found a few articles that seem very similar to mine.