cv carb
Thread Starter
|
Advanced
Joined: Apr 2009
Posts: 99
Likes: 0
From: forest city n.c.
cv carb
mine as pick up a low throttle stumble or miss as some would say. clean carb to no pevail. unplug my air mixing screw and check and it is turn out one full turn from close. seam like I read it should be 2 turns out. went out 2 turn and it seam to be rich and my enricher didn't seam to work right. hard to choke it . carb is stock with the #45 slow jet, and I belive the #175 main. any sugestion to removing this miss. it is missing right when I am rolling back into the throttle. give more throttle and it is fine. thanks. 1990 flt stock evo engine.
HDF Community Team
Joined: Dec 2005
Posts: 5,404
Likes: 2,605
From: NC USA
mine as pick up a low throttle stumble or miss as some would say. clean carb to no pevail. unplug my air mixing screw and check and it is turn out one full turn from close. seam like I read it should be 2 turns out. went out 2 turn and it seam to be rich and my enricher didn't seam to work right. hard to choke it . carb is stock with the #45 slow jet, and I belive the #175 main. any sugestion to removing this miss. it is missing right when I am rolling back into the throttle. give more throttle and it is fine. thanks. 1990 flt stock evo engine.
If you use the "spray it with WD40, carb cleaner, propane" method and listen for a change in sound, get someone to hold a tube of some sort at the carb intake because any vapor it pulls in thru the throat will give a false indication of the leak, especially when checking the mainfold/carb grommet.
Road Master
Joined: Aug 2006
Posts: 1,148
Likes: 157
From: Banning, CA
Jetting info
mine as pick up a low throttle stumble or miss as some would say. clean carb to no pevail. unplug my air mixing screw and check and it is turn out one full turn from close. seam like I read it should be 2 turns out. went out 2 turn and it seam to be rich and my enricher didn't seam to work right. hard to choke it . carb is stock with the #45 slow jet, and I belive the #175 main. any sugestion to removing this miss. it is missing right when I am rolling back into the throttle. give more throttle and it is fine. thanks. 1990 flt stock evo engine.
screw and replace the needle with 1988 Sportster - needle N65C part # 277094-88.
Clean carb with Gumout Jet Spray while it's apart.
If you have a vacuum leak, it will not fix / cover it up - just put your jetting spot on.
IMHO.
Thread Starter
|
Advanced
Joined: Apr 2009
Posts: 99
Likes: 0
From: forest city n.c.
some things that I have already done. new intake and carb gasket. new voes vacum hose. spray wd 40 over every thing looking for a vacum leak. I change the #45 jet with a new #45 jet. pull needle out and clean it and check the diapram for a tear. none found. one question I have is this, how can you tell if your enricher has a vacum leak? other than that I can't find a vacum leak anywhere.
Trending Topics
Thread Starter
|
Advanced
Joined: Apr 2009
Posts: 99
Likes: 0
From: forest city n.c.
one other thing. stock breather but I have samson slip-on muffler. I have had muffler on for a while with no problems untill recent.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
HDF Community Team
Joined: Dec 2005
Posts: 5,404
Likes: 2,605
From: NC USA
some things that I have already done. new intake and carb gasket. new voes vacum hose. spray wd 40 over every thing looking for a vacum leak. I change the #45 jet with a new #45 jet. pull needle out and clean it and check the diapram for a tear. none found. one question I have is this, how can you tell if your enricher has a vacum leak? other than that I can't find a vacum leak anywhere.
Now this is gonna sound dumb, but I had similar symptoms once and turned out to be a crappy spark plug. They were "V-fire" plugs and with low miles. Try some new Champion RN12YC plugs (they're cheap) and lets eliminate that possibility
Novice
Joined: Oct 2009
Posts: 18
Likes: 0
From: Joplin, Missouri
Similar problem
Would the plugs cause the bike to stumble only at low rpms? I am having a similar problem with my 93 flstf. I have cleaned the carb, checked the diaphragm, put my old stock ignition module in, put the stock coil back in, (I had changed them to Screamin Eagle several years back, and after some digging found the old ones). Pulled the plug wires off my shovel and put them on, changed the gas, and checked the seals. Damn thing still stumbles violently under load at heavy throttle and low (1000-1500) rpm. Once it's above about 2500 rpm, it takes off like a rocket. Well, as well as a slightly modified 80" evo can resemble a rocket anyway.
Update - Problem Solved!
Finished putting things back together last night at about 10pm. I bought new intake and carb seals, and brand new plugs. Took it out for a test spin, and nothing had changed. However, this was the first time since the problem began that I had ridden the bike at night. When the bike was missing/chugging, I noticed a barely perceptible flicker in the headlight. Today, found that the cable at the starter was either broken loose or about to break. Not sure exactly because it came free real easy when I gave it a wiggle. Replaced that, and it pulls fine all the way from 1000 rpm up. I'm just amazed that the bike was able to start with the cable in that shape.
Oh yeah, I figured out by reading some other posts that by posting my problem within this thread that I was "poaching". Sorry, and won't happen again.
Update - Problem Solved!
Finished putting things back together last night at about 10pm. I bought new intake and carb seals, and brand new plugs. Took it out for a test spin, and nothing had changed. However, this was the first time since the problem began that I had ridden the bike at night. When the bike was missing/chugging, I noticed a barely perceptible flicker in the headlight. Today, found that the cable at the starter was either broken loose or about to break. Not sure exactly because it came free real easy when I gave it a wiggle. Replaced that, and it pulls fine all the way from 1000 rpm up. I'm just amazed that the bike was able to start with the cable in that shape.
Oh yeah, I figured out by reading some other posts that by posting my problem within this thread that I was "poaching". Sorry, and won't happen again.
Last edited by eightballdave; Aug 7, 2010 at 07:52 PM.