05 old dog
Well-Known Member
im fighting the same surging problem...been from a 29-33 int and lots of adjusting on the air screw and cant get it to go away.....
Tuning XXX Carb w/ K&N Duel Intake
- Thread starter PHATASS
- Start date
hi brian just notice you updated thank you...i have the same problem as 05 old dog does hoping one of us will figure it out...ive ran the xxx for awhile threw several engine upgrades and always it went bact to the a/b..this time with so manny mods...i'm really thinkin about takin out the purple emulsion tube..sachs says thats really screwing with the air flow.. been wanting to do this for awhile but just havent had time... work and some family health issues really limit and put shit in perspective....good luck and plz keep me posted on the surging..although i think it will come down to different setting bein different locations... but your not to far from me1 state....
ronson1977
Member
You have a link for that 34 jet? I wanna give it a shot. Belay that, just saw the link...
PHATASS
Active Member
I'll keep ya updated. Right now I'm trying to figure out this whinning noise when downshifting.
http://www.bigdogbiker.com/forums/general/31982-noise-down-shifting.html#post485772
ronson1977
Member
I was going to order a jet from that zippers place in the link but not only to they make you call and talk to a less than enthusiastic rep but the jet was on back order for weeks. So I called Bob @ XXX and he's getting some out to me right away. Always eager to sit on the phone and help, a great guy. I'm calling Bob 1st from now on.
05 old dog
Well-Known Member
well get it in there and let us know....more than 1 fighting this problem...
ronson1977
Member
Will do
ronson1977
Member
Put the 34 in yesterday and bumped the main from a 72 to 74. Much smoother now. Not quite perfect yet. Think I'm gonna throw in the 35 and see how she goes. I'm on the right track though.
05 old dog
Well-Known Member
hmmmm...im at 33 may have to give that a shot...
ronson1977
Member
Had some popping after the change today from the main so I'm going back to the 72. Still feeling out the intermediate.
Staffy
Active Member
Notice a lot of attention being focused on the int and main jets, what most of us miss is the "air bleed". Without getting into a thesis, most of us use "high flow" air filters and the transition from int to main (around 2500RPM)can get tricky causing some of the issues described in this thread – stumble and lean/rich mixtures). In fact, an extreme airflow condition (velocity stack) may cause a vacuum that could draw fuel in from the carb’s bowl vent and cause unexpected results (rich condition). Boring out the carb’s throat (part of the XXX mods) definitely helps smoothen out the air/fuel surge. Leaving the int around 32-33 and the main around 78-82, I strongly recommend moving up the air bleed to around 68-72 (and above if you are using a Thunder Jet). The air bleed jet controls when the main jet kicks in and the rate of fuel. Give it a try, you will be glad you did. (PS. Depending on the filter, opening the bowl vent may be an option)
ronson1977
Member
My air bleed is a 66 per the XXX mod and is showing no indication of needing adjustment, as it serves the purpose of easing the transition from intermediate to main to which there have been no unfavorable symptoms.
francoblay1
The Spaniard
Very interesting Thread indeed.... c´mon Guys... don´t stop half way!!!
DaFrankster
New Member
Any progress?
Any "new" scoop on your intermediate jet situation? Sounds like you gained some ground with the 34...?
Best of luck---
D-
Any "new" scoop on your intermediate jet situation? Sounds like you gained some ground with the 34...?
Best of luck---
D-