cold starting and idleing problem - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 14 (permalink) Old 07-12-2012, 10:37 AM Thread Starter
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cold starting and idleing problem

Hey everyone, I have been fighting a problem for quite a while, When I first start my 1993 vulcan the rear cylinder doesnt fire, if I rev it up it will fire, and after it warms up it runs fine and idles at 1100 rmp. I am getting plenty of gas, I pulled a plug and turned it over and the spark seems great. I have put iridum plugs in it. and changed the rear plug wires. If it was a fuel problem wouldnt it happen all the time not just when its cold. any advice would be appreciated
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post #2 of 14 (permalink) Old 07-12-2012, 10:50 AM
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Have you checked the carbs for clean pilots, appropriate float levels, and performed a sync?

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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post #3 of 14 (permalink) Old 07-12-2012, 10:54 AM
..have a vulcan good day!
 
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I had rear cylinder firing intermittently, cleaned all coil connections, connector plugs and Ignitor connector...no help.
I replaced the Ignitor Box...problem resolved.

I have also added a relay which places battery 12 -13V directly onto the coils, thus no loss (voltage drop) through bike electrical harness.

WilliamTech

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #4 of 14 (permalink) Old 07-12-2012, 12:27 PM
..have a vulcan good day!
 
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Quote:
I have also added a relay which places battery 12 -13V directly onto the coils, thus no loss (voltage drop) through bike electrical harness.
https://www.vn750.com/forum/showthread.php?t=17276

Hope this helps
WilliamTech

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
WilliamTech is offline  
post #5 of 14 (permalink) Old 07-12-2012, 12:44 PM
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I had the same issue until I dumped half a can of seafoam in. It idles just fine cold now. I still have to choke it to start it, but I accept that.

I only understand what I don't understand.
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post #6 of 14 (permalink) Old 07-12-2012, 05:04 PM Thread Starter
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just replaced my ignitor with one from a friends bike, and unfortunatly it didnt change a thing. I have been trying to avoid taking the carbs out but I guess I have tried everything else. so thats what I will do next. thanks guys.
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post #7 of 14 (permalink) Old 07-20-2012, 05:36 PM Thread Starter
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well just finished removing and cleaning the carbs, also did a sync. still no change. could it be an internal engine problem
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post #8 of 14 (permalink) Old 07-20-2012, 06:00 PM
..have a vulcan good day!
 
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Quote:
Originally Posted by Tony D. View Post
well just finished removing and cleaning the carbs, also did a sync. still no change. could it be an internal engine problem
Quote:
Hey everyone, I have been fighting a problem for quite a while, When I first start my 1993 vulcan the rear cylinder doesn't fire, if I rev it up it will fire, and after it warms up it runs fine and idles at 1100 rmp. I am getting plenty of gas, I pulled a plug and turned it over and the spark seems great. I have put iridum plugs in it. and changed the rear plug wires. If it was a fuel problem wouldn't it happen all the time not just when its cold. any advice would be appreciated
I still say it's electrical.............
Quote:
I have also added a relay which places battery 12 -13V directly onto the coils, thus no loss (voltage drop) through bike electrical harness. WilliamTech
Read Post #10 & Post # 12 in the following link:
https://www.vn750.com/forum/showthread.php?t=17276

give it a shot
hope this helps
WilliamTech

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
WilliamTech is offline  
post #9 of 14 (permalink) Old 07-20-2012, 07:50 PM Thread Starter
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thanks for all your help William. I know you have posted to my questions in the past, and I appreciate it. I will give this mod a try, I have been thinking its electrical from the start, but this is my first bike and I didnt know where to start. So thanks again and I will keep you posted.
Tony D. is offline  
post #10 of 14 (permalink) Old 07-20-2012, 07:55 PM
..have a vulcan good day!
 
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Quote:
Originally Posted by Tony D. View Post
thanks for all your help William. I know you have posted to my questions in the past, and I appreciate it. I will give this mod a try, I have been thinking its electrical from the start, but this is my first bike and I didnt know where to start. So thanks again and I will keep you posted.
Replacing the Ignitor cured my problem. They are not that expensive.

WilliamTech

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
WilliamTech is offline  
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