coughing

Eddie R. · 02-26-2015, 01:47 PM

Hello All,

Intro first. Owned several Concours, and BMW's. This is my second Nomad. Picked this one up in November from a widow whose hubby only put 5,529 miles on it with no up grades! Its a '99 Green model exactly like my first one. Yes, I know about the plastic oil gear and a few other oddities. This is a great site with wonderful information...txks to this group for filling up my reading time!
I have gutted the mufflers, and installed an 8.5 inch open air cleaner. I went from a 45 to 46 pilotjet, a 145 to 147 main jet and a EZ-Just Mixture Screw for CVK carb.
I am stilling getting a cough once in a while after idle off. Have I not gone far enough with the mixture screw yet? The performance certainly has improved, but the cough bothers me somewhat.
Do I need to turn out on the mixture screw some more...seems to be about 3 turns now?
Thanks for any help.

redjay · 02-26-2015, 02:18 PM

Hello and Welcome.

If its any consolation my FI Nomad and FI Voyager both "coughed" occasionally out of the intake.

Bud2rat · 02-26-2015, 03:00 PM

Welcome Eddie R from just down the road in St. Pauls, NC.

wordwalker · 02-26-2015, 04:23 PM

I have a 2007 Vulcan 1600D Nomad that has been hiccupping or burping a lot lately. Sometimes as prepare to change gears. Its not so much a backfire as a miss any ideas on what's causing it and or what to do to fix the problem. I've added fuel stabilizer, Sea Foam, octane boosters and nothing seems to help.

rick6375 · 02-26-2015, 08:03 PM

Have always been told an intake cough/backfiring was from a lean mixture. If idle mixture is that far out already, may need to go up another size on the pilot. No expert, going from everything I've learned and been told.

**vulcanscott** · 02-27-2015, 07:10 AM

main jet required on 1500 is normally 168-170 with open breather . Just a thought > I went 168 & 45 pilot on my 99 and have a 170 & 46 pilot to go on my 01 1500 when the weather breaks . to busy hauling gas right now .

**ringadingh** · 02-27-2015, 08:55 AM

Welcome aboard! I think your on your own for carb settings, all I can offer is to make big changes in the screw settings, and then back up to where it runs best. This way you will see if it makes a difference with the direction your going.

jd01 · 02-27-2015, 10:07 AM

I have a 2001 carbed Nomad and did the Coyote intake mod from Gadget's website. I went with the 46 pilot jet, 170 main jet and 3 turns out on the pilot screw. Been running great since, averaging 39-40 mpg.

**ray2** · 02-27-2015, 07:51 PM

Have a Kaw 250cc ATV that coughed a lot put some mystery marvel oil in the gas and in a short time it was running good.

Eddie R. · 03-05-2015, 10:09 AM

Adjusted the idle mixture screw out 1/2 turn. Increased the idle as it seemed to low. Rode a half a tank yesterday and not one cough!

Thanks guys for all the ideas.

02-26-2015, 01:47 PM	#1
Eddie R. Jr. Member Join Date: Nov 2014 Location: Fuquay Varina, NC Posts: 48	coughing Hello All, Intro first. Owned several Concours, and BMW's. This is my second Nomad. Picked this one up in November from a widow whose hubby only put 5,529 miles on it with no up grades! Its a '99 Green model exactly like my first one. Yes, I know about the plastic oil gear and a few other oddities. This is a great site with wonderful information...txks to this group for filling up my reading time! I have gutted the mufflers, and installed an 8.5 inch open air cleaner. I went from a 45 to 46 pilotjet, a 145 to 147 main jet and a EZ-Just Mixture Screw for CVK carb. I am stilling getting a cough once in a while after idle off. Have I not gone far enough with the mixture screw yet? The performance certainly has improved, but the cough bothers me somewhat. Do I need to turn out on the mixture screw some more...seems to be about 3 turns now? Thanks for any help. Login or Register to Remove Ads
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02-26-2015, 02:18 PM	#2
redjay Top Contributor Join Date: Feb 2008 Location: Ontario Posts: 6,931	Hello and Welcome. If its any consolation my FI Nomad and FI Voyager both "coughed" occasionally out of the intake. Last edited by redjay; 02-26-2015 at 03:44 PM.
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02-26-2015, 03:00 PM	#3
Bud2rat Sr. Member Join Date: Jan 2012 Location: St. Pauls, NC Posts: 2,089	Welcome Eddie R from just down the road in St. Pauls, NC. __________________ Robert Torrey VBA# 02077 Vroc# 27672 1996 800A Customized (SOLD) 2001 1500 Nomad (The Mistress) 2013 Voyager 2014 SE Rally - Elkins, WV 2016 SE Rally - Helen, Ga
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02-26-2015, 04:23 PM	#4
wordwalker Jr. Member Join Date: May 2014 Location: Tucson, AZ Posts: 14	Engine misses I have a 2007 Vulcan 1600D Nomad that has been hiccupping or burping a lot lately. Sometimes as prepare to change gears. Its not so much a backfire as a miss any ideas on what's causing it and or what to do to fix the problem. I've added fuel stabilizer, Sea Foam, octane boosters and nothing seems to help. __________________ Be blessed & keep the shiny side up, Geo AKA wordwalker
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02-26-2015, 08:03 PM	#5
rick6375 Member Join Date: Dec 2013 Location: New Castle, In. Posts: 365	Have always been told an intake cough/backfiring was from a lean mixture. If idle mixture is that far out already, may need to go up another size on the pilot. No expert, going from everything I've learned and been told. __________________ 2005 800 Classic 2012 Voyager ABS Login or Register to Remove Ads
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02-27-2015, 07:10 AM	#6
vulcanscott Join Date: Oct 2013 Location: chandler okla Posts: 854	main jet required on 1500 is normally 168-170 with open breather . Just a thought > I went 168 & 45 pilot on my 99 and have a 170 & 46 pilot to go on my 01 1500 when the weather breaks . to busy hauling gas right now .
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02-27-2015, 08:55 AM	#7
ringadingh Join Date: Aug 2007 Location: Newmarket Ontario Canada Posts: 35,387	Welcome aboard! I think your on your own for carb settings, all I can offer is to make big changes in the screw settings, and then back up to where it runs best. This way you will see if it makes a difference with the direction your going. __________________ 2002 Nomad aka Bountyhunter VBA #27 VROC #18951
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02-27-2015, 10:07 AM	#8
jd01 Advanced Member Join Date: Feb 2008 Location: Canton,Georgia Posts: 851	I have a 2001 carbed Nomad and did the Coyote intake mod from Gadget's website. I went with the 46 pilot jet, 170 main jet and 3 turns out on the pilot screw. Been running great since, averaging 39-40 mpg. __________________ Don Denman "JD" 2001 Luminous Vintage Red carbed 1500 Nomad VBA #376 VROC #6195
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02-27-2015, 07:51 PM	#9
ray2 Join Date: Jan 2011 Location: Minnesota Posts: 939	Have a Kaw 250cc ATV that coughed a lot put some mystery marvel oil in the gas and in a short time it was running good. __________________ Ray Minnesota 2010-1700-Nomad VBA#01525
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03-05-2015, 10:09 AM	#10
Eddie R. Jr. Member Join Date: Nov 2014 Location: Fuquay Varina, NC Posts: 48	Update on coughing Adjusted the idle mixture screw out 1/2 turn. Increased the idle as it seemed to low. Rode a half a tank yesterday and not one cough! Thanks guys for all the ideas.
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