Bike won't start after Tuxedo mod - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
Includes Electrical mods, Lights, Stator,
Rectifier, Diagrams, etc

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 17 (permalink) Old 08-14-2016, 02:21 AM Thread Starter
Member
 
DR.BADNEWS's Avatar
 
Join Date: Aug 2015
Location: Virginia Beach
Posts: 53
iTrader: (0)
 
Bike won't start after Tuxedo mod

Today I finally finished piecing my bike back together after installing the tuxedo mod, replacement stator, and reinstalling the surge tank and air boxes, however, I wasn't able to get it up and running. The bike just cranks for a minute or so until the battery dies. Tightening the idle speed adjustment screw makes the bike crank faster, but it unresponsive to choke and throttle movement. I feel pressure coming from the exhaust pipes, but I'm not getting any backfiring or even sure that I'm getting spark at the plugs because it doesn't sound like it's firing.

Before I disassembled it, the bike ran off the battery just fine until it'd die, and I didn't mess with timing or anything valve related in the process. I checked the jets when I had the carbs off and they looked clean as a whistle, so I didn't bother inspecting much deeper into finding the float bowls. And I've made sure all the grounds to my knowledge are secured. Pick-up coils are in the stock positions. And I can't think of any missed connections.

The bike has had straight pipes, a jet kit, and was ear shaved by a previous owner, but I just reinstalled the stock intake with K&N filters. I did the two wire and blue wire mods after the stator failed in November to keep it running for as long as I could get away with it. I was concerned about fuel to air mixture, but I figured it'd atleast start and run a little groggy if that was the case. I adjusted the idle fuel/air mixtures screws to 2 turns out, but I'm not sure if I need to bring them in or out with the jet kit.

Today was also 100F here in Virginia, so I wouldn't imagine it'd take a lot to get it started. But it was having a bit of hot starting issues before I took it apart, or maybe that was because the battery was nearly dead after riding it around.

The only electrical connections in question I can think of is the red and green wires that plug into a solenoid looking thing in front of the battery and the two prong outlet on the other solenoid looking thing on the right. But switching those around seemingly did nothing to help. There's some sort of clicking in the electronics under the seat when it cranks, but that may be normal.

Can't think of any other important wires or connections, I don't know much about electronics and circuits. I'm gonna check and replace the spark plugs tomorrow with iridiums, because I do that with all my vehicles. Then look into the coil relay mod, but that shouldn't be necessary if I did everything right. Last case scenario I'll adjust pick-up coil clearance to .2mm or whatever, but I REALLY don't want to take the crank case apart again after filling it up with oil.

Can anyone explain what I might be missing here?

EDIT: Bike finally started after 4-5 hours of frustration trying to get it started without changing much. Bike runs like **** at low-end speeds, but was slightly improving over the trip to and from work with a butt load of seafoam and a near full tank of fresh gas. Bike ran for about one day then battery already killing itself in less than 30 miles on a full charge... Another stator gone bad, or is something not wired up correctly here?

Last edited by DR.BADNEWS; 08-30-2016 at 08:19 PM. Reason: Change in circumstances
DR.BADNEWS is offline  
Sponsored Links
Advertisement
 
post #2 of 17 (permalink) Old 08-14-2016, 02:27 AM
1986 VN750
 
thtanner's Avatar
 
Join Date: Nov 2011
Location: Dana Point, CA
Posts: 3,255
iTrader: (8)
 
Garage
1: Is the petcock turned to "on"

2: Check spark! Pull a plug, hold it against the frame and see if it sparks.

3: Check for fuel.. by pulling a plug and seeing if it's wet (if no spark)

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
thtanner is offline  
post #3 of 17 (permalink) Old 08-14-2016, 04:05 AM
Senior Member
 
Join Date: Nov 2015
Location: Pittsburgh, PA
Posts: 975
iTrader: (0)
 
Garage
Quote:
Originally Posted by thtanner View Post
1: Is the petcock turned to "on"

2: Check spark! Pull a plug, hold it against the frame and see if it sparks.

3: Check for fuel.. by pulling a plug and seeing if it's wet (if no spark)
What he said. Hopefully #1 fixes it. if not, the answers to 2 and 3 will lead to the next troubleshooting step.

1992 US-nonCA * tuxedo mod * r/r relocated

Vulcan slang for newcomers
Service Manual Download
Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
Thorn is offline  
 
post #4 of 17 (permalink) Old 08-14-2016, 09:35 AM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 6,440
iTrader: (5)
   
Agreed, check #2 and 3.

If it sat a while during the mod, ethanol may have caused the petcock diaphragm to stick closed. Or it can be a stuck float valve in the carbs. A prime into the the intake may get it going, using gas or starting fluid.

But we need to verify spark and fuel in order to proceed.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
post #5 of 17 (permalink) Old 08-26-2016, 11:21 PM Thread Starter
Member
 
DR.BADNEWS's Avatar
 
Join Date: Aug 2015
Location: Virginia Beach
Posts: 53
iTrader: (0)
 
I'm really hoping it's the spark plugs or previously being flooded. Could I blow into the gas cap to get gas through the petcock if it clogged? I only sat for a couple months...
DR.BADNEWS is offline  
post #6 of 17 (permalink) Old 08-26-2016, 11:27 PM
FREEBIRDS MC CENTRAL NY
 
OleDirtyDoc's Avatar
 
Join Date: May 2011
Location: Norwich,NY
Posts: 15,864
iTrader: (0)
     
Garage
Send a message via Yahoo to OleDirtyDoc
If you were me you'd ask a prospect to do it

ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
OleDirtyDoc is offline  
post #7 of 17 (permalink) Old 08-27-2016, 09:46 AM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 6,440
iTrader: (5)
   
Quote:
Originally Posted by DR.BADNEWS View Post
I'm really hoping it's the spark plugs or previously being flooded. Could I blow into the gas cap to get gas through the petcock if it clogged? I only sat for a couple months...
Probably won't work. Might try applying vacuum to the vac line and see if the gas flows..

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
post #8 of 17 (permalink) Old 08-27-2016, 01:18 PM
Senior Member
 
Join Date: Nov 2015
Location: Pittsburgh, PA
Posts: 975
iTrader: (0)
 
Garage
Quote:
Originally Posted by Spockster View Post
Probably won't work. Might try applying vacuum to the vac line and see if the gas flows..
This. The petcock will only let fuel through if a vacuum is applied to the 'middle' line. Then fuel will flow out both sides under gravity. Something as small as a syringe can provide the appropriate vacuum.

1992 US-nonCA * tuxedo mod * r/r relocated

Vulcan slang for newcomers
Service Manual Download
Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
Thorn is offline  
post #9 of 17 (permalink) Old 08-27-2016, 08:30 PM
FREEBIRDS MC CENTRAL NY
 
OleDirtyDoc's Avatar
 
Join Date: May 2011
Location: Norwich,NY
Posts: 15,864
iTrader: (0)
     
Garage
Send a message via Yahoo to OleDirtyDoc
Quote:
Originally Posted by DR.BADNEWS View Post
I'm really hoping it's the spark plugs or previously being flooded. Could I blow into the gas cap to get gas through the petcock if it clogged? I only sat for a couple months...
If it has a prime function should work

ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
OleDirtyDoc is offline  
post #10 of 17 (permalink) Old 08-28-2016, 05:16 PM Thread Starter
Member
 
DR.BADNEWS's Avatar
 
Join Date: Aug 2015
Location: Virginia Beach
Posts: 53
iTrader: (0)
 
Changing the spark plugs did absolutely nothing for me. the bike seems like it really has to struggle and huff when cranking and it'll crank and crank for about 2-3 minutes before the battery dies. I'm gonna check to see if the spark plugs are "wet". Can crush washers be reused like that?
DR.BADNEWS is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome