Backfire and an ugly noise

Orono · 05-24-2016, 01:59 PM

I have gained a LOT of knowledge through this site and now in need of more

I have a 05 Nomad 1600 with 45K miles.

Was out yesterday with a group and the better half for a cruise and all was good. Covered approx 150 mile no issues. we stopped to re-group and after 10 minutes I tried to restart. Turned over fine but would not catch. turned the key off/on (sometime the fuel pump does not kick in). Started this time but with a REALLY LOUD backfire and a bad noise...almost a squeek sound.

We were able to get home with out any decrease in power, the oil pressure did not change, temp was fine and no loss of power. Just that noise that changes with the rpm's.

I can confirm that it sounds like it is coming from the back cylinders

Some of the mods done before me are as follows:

Kuryakan Fuel Controller
K/N Filters with all the insides removed...reed valves, has backer plates, etc.
Cam Chain Extenders were done

Not sure where to start diagnosing this one, other than taking it to the dealer.

Thanks in advance for the feedback

**ringadingh** · 05-24-2016, 04:16 PM

Does it start ok now, or still takes a lot of cranking?
I'm wondering if its possible itjumped a tooth on the timing chain.

skullbagger · 05-24-2016, 04:52 PM

Vapor lock maybe, mine did this years ago
May hour vent tube is clogged and or the tank vent by the cap

Sent from my iPhone using Tapatalk

**vulcanscott** · 05-24-2016, 06:19 PM

I am thinking Intake leak ! Spray all around it with carb cleaner . or possible gasket on reed valve plates . Let us know what You find !

Orono · 05-24-2016, 08:25 PM

Scott I think you hit dead on for the noise. I stopped at a shop in my way home and one of the guys said it sounded like an exhaust issue. The backfire probably blew something loose. I checked the plate I made for the reed valves and it sounds like it is coming from there.

I made a couple of plates from 1/8 aluminum plate thinking it would be ok. As far a s gaskets at concerned, should I order new ones or would standard gasket material work?

Not sure why it backfire...fuel lock maybe? Vent hose are all clear...did start to notice the singing from the tank now that it has warmed up.

Hey Ring, where do you have your service done or are you doing it all yourself.. I would like to hear another 1600 to compare sounds?

**vulcanscott** · 05-24-2016, 08:58 PM

the times I have blocked reeds I got lucky enough to come out with good used gaskets I did use high temp silicone sparingly . You should get new gaskets unless You can come up with a high temp material You might try a hearth shop or fire place supply . check Your Plates for flatness on a sheet of glass the sound You describe is like exhaust whistling through between the plates and gaskets .Hope this Helps !

**vulcanscott** · 05-25-2016, 12:20 AM

on a lighter Note I have never had a Vulcan that did not Backfire just cause it wanted to every now & then !

Orono · 05-25-2016, 10:18 PM

Pulled the plates off and checked them. Added another gasket and the original valve that was in there to provide a stiffer plate and tighter seal on the gaskets. Worked great!! Went for a ride and back to normal.

The information available in this family is awesome!! Thanks for the input!!!

**ringadingh** · 05-26-2016, 08:03 AM

Quote:

Originally Posted by Orono

Hey Ring, where do you have your service done or are you doing it all yourself.. I would like to hear another 1600 to compare sounds?

Ive done all my own service on the bike.

05-24-2016, 01:59 PM	#1
Orono Jr. Member Join Date: Oct 2015 Location: Newcastle,Ontario Posts: 12	Backfire and an ugly noise I have gained a LOT of knowledge through this site and now in need of more I have a 05 Nomad 1600 with 45K miles. Was out yesterday with a group and the better half for a cruise and all was good. Covered approx 150 mile no issues. we stopped to re-group and after 10 minutes I tried to restart. Turned over fine but would not catch. turned the key off/on (sometime the fuel pump does not kick in). Started this time but with a REALLY LOUD backfire and a bad noise...almost a squeek sound. We were able to get home with out any decrease in power, the oil pressure did not change, temp was fine and no loss of power. Just that noise that changes with the rpm's. I can confirm that it sounds like it is coming from the back cylinders Some of the mods done before me are as follows: Kuryakan Fuel Controller K/N Filters with all the insides removed...reed valves, has backer plates, etc. Cam Chain Extenders were done Not sure where to start diagnosing this one, other than taking it to the dealer. Thanks in advance for the feedback Login or Register to Remove Ads
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05-24-2016, 04:16 PM	#2
ringadingh Join Date: Aug 2007 Location: Newmarket Ontario Canada Posts: 35,387	Does it start ok now, or still takes a lot of cranking? I'm wondering if its possible itjumped a tooth on the timing chain. __________________ 2002 Nomad aka Bountyhunter VBA #27 VROC #18951
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05-24-2016, 04:52 PM	#3
skullbagger Advanced Member Join Date: Apr 2014 Location: N.C. Posts: 727	Backfire and an ugly noise Vapor lock maybe, mine did this years ago May hour vent tube is clogged and or the tank vent by the cap Sent from my iPhone using Tapatalk __________________ " If your like most people its not for you " VULCAN VAQUERO
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05-24-2016, 08:25 PM	#5
Orono Jr. Member Join Date: Oct 2015 Location: Newcastle,Ontario Posts: 12	Scott I think you hit dead on for the noise. I stopped at a shop in my way home and one of the guys said it sounded like an exhaust issue. The backfire probably blew something loose. I checked the plate I made for the reed valves and it sounds like it is coming from there. I made a couple of plates from 1/8 aluminum plate thinking it would be ok. As far a s gaskets at concerned, should I order new ones or would standard gasket material work? Not sure why it backfire...fuel lock maybe? Vent hose are all clear...did start to notice the singing from the tank now that it has warmed up. Hey Ring, where do you have your service done or are you doing it all yourself.. I would like to hear another 1600 to compare sounds? Login or Register to Remove Ads
	0

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05-24-2016, 06:19 PM	#4
vulcanscott Join Date: Oct 2013 Location: chandler okla Posts: 854	I am thinking Intake leak ! Spray all around it with carb cleaner . or possible gasket on reed valve plates . Let us know what You find !
	0

05-24-2016, 08:58 PM	#6
vulcanscott Join Date: Oct 2013 Location: chandler okla Posts: 854	the times I have blocked reeds I got lucky enough to come out with good used gaskets I did use high temp silicone sparingly . You should get new gaskets unless You can come up with a high temp material You might try a hearth shop or fire place supply . check Your Plates for flatness on a sheet of glass the sound You describe is like exhaust whistling through between the plates and gaskets .Hope this Helps !
	0

05-25-2016, 12:20 AM	#7
vulcanscott Join Date: Oct 2013 Location: chandler okla Posts: 854	on a lighter Note I have never had a Vulcan that did not Backfire just cause it wanted to every now & then !
	0

05-25-2016, 10:18 PM	#8
Orono Jr. Member Join Date: Oct 2015 Location: Newcastle,Ontario Posts: 12	Pulled the plates off and checked them. Added another gasket and the original valve that was in there to provide a stiffer plate and tighter seal on the gaskets. Worked great!! Went for a ride and back to normal. The information available in this family is awesome!! Thanks for the input!!!
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