06 Sportster cough off Idle
Road Warrior
Joined: Jul 2012
Posts: 1,566
Likes: 55
From: Londonderry, NH
I should have mentioned I still get coughs off idle. They're just a little more rare now.
I am ordering a new needle this week. I was just going to get the CVP velocity needle. Do I really need the N65C?
I'm going to bump up my pilot jet again anyway. I have parts at the dealer I need to pick up so Im going to pick up a 48 to try first and a 46 if they have them to test out both. 3.5-4 turns out is too much on my mix screw to be running this lean still.
I am ordering a new needle this week. I was just going to get the CVP velocity needle. Do I really need the N65C?
I'm going to bump up my pilot jet again anyway. I have parts at the dealer I need to pick up so Im going to pick up a 48 to try first and a 46 if they have them to test out both. 3.5-4 turns out is too much on my mix screw to be running this lean still.
You can verify by adding 1-2 shims (thin washers) under the stock needle to raise it.
I agree 3.5-4 turns out is too much.
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Cruiser
Joined: Mar 2014
Posts: 218
Likes: 1
From: Michigan
Well I broke down and ordered a new needle, and a couple jets. My bike is definitely running lean. It pops on decel, and all the popping/coughing goes away when I pull the enrichener out a bit. I know a 48 pilot should be too much for a stage 1 1200 but Im guessing that my air filter pumps in a ton of air. I also went ahead and got a 185 main since my carb is currently running a 180. I have a TC88A ignition in the mail as well. I'm hoping with the jets, needle, and ignition I can get this thing running as it should! I'll update when I get everything installed later this week.
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Cruiser
Joined: Mar 2014
Posts: 218
Likes: 1
From: Michigan
Just another update.
got my new jets and new CV performance velocity needle in the mail this week. Pulled my carb today to install them. I bought a 48 pilot and a 185 main, decided to only install the 48 pilot.
What a difference!!! No more carb cough! I was able to set my mix screw at 2 turns out and she fired right up! Popping on decel was drastically reduced, acceleration was increased and oh my god the throttle response! it's like a completely different bike! all this tuning and test riding was done when it was 68* today so I know for a fact now my air cleaner was pullign too much air. I've read tons of times that a 48 should be much too big for a stage 1 1200 but seriously it made a huge difference! I havent seen any signs of running rich yet, no black smoke or anything but I'm sure my MPG will take a hit. I bought this bike to be a hot rod so i dont really care about MPG. I'll run it like this for a while and see how it does!
got my new jets and new CV performance velocity needle in the mail this week. Pulled my carb today to install them. I bought a 48 pilot and a 185 main, decided to only install the 48 pilot.
What a difference!!! No more carb cough! I was able to set my mix screw at 2 turns out and she fired right up! Popping on decel was drastically reduced, acceleration was increased and oh my god the throttle response! it's like a completely different bike! all this tuning and test riding was done when it was 68* today so I know for a fact now my air cleaner was pullign too much air. I've read tons of times that a 48 should be much too big for a stage 1 1200 but seriously it made a huge difference! I havent seen any signs of running rich yet, no black smoke or anything but I'm sure my MPG will take a hit. I bought this bike to be a hot rod so i dont really care about MPG. I'll run it like this for a while and see how it does!
Stellar HDF Member
Joined: Feb 2013
Posts: 3,072
Likes: 1,727
From: Dallas, Texas
Most CV 40 Tuner Kits tell you to drill out the diaphragm vacuum port. IF a previous owner hogged it out, your diaphragm will flutter under certain conditions and make it fart through the carb. IF the slide spring is too light, it will make the carb fart. 45/180 is on the mark for the jetting, 2 shim washers under the needle valve is good. Play with the mixture screw.
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