Losing power to front coil upon acceleration - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Where does this wire go?
Includes Electrical mods, Lights, Stator,
Rectifier, Diagrams, etc

LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 02-15-2011, 05:03 AM Thread Starter
Join Date: Dec 2010
Posts: 448
iTrader: (3)
Losing power to front coil upon acceleration

I took my bike out for a ride today, weather in the mid 50's, she ran great until I was heading home after about a 10 mile ride, and she started losing power and not accelerating. It did it for roughly a half mile, and I thought it was fuel related, then I happened to look at my tach, and the RPM's were at zero.
It would idle fine, and accelerate fine to about 2,500 RPM's, then just not go any further.
I played with the kill switch on the handlebar, and the key but nothing happened while I was riding.
My charging system works fine, and the battery has a full charge.
Any ideas? I'm going to take my key switch apart tomorrow to see if it's dirty or corroded inside like the other switches were.
BTW I had the front coil off the other day, and had a problem with it working after I put it all together, but I have ridden it approx 30 miles after that w/o any problems.
Thanks all.
RakerBill is offline  
Sponsored Links
post #2 of 4 (permalink) Old 02-15-2011, 05:52 AM
Members who have donated towards server costs
Join Date: Jun 2010
Posts: 386
iTrader: (5)

Last edited by FlacoLove; 03-25-2013 at 11:21 PM. Reason: PS..
FlacoLove is offline  
post #3 of 4 (permalink) Old 02-15-2011, 08:58 AM
Member? ... check.
ZCraggRatt's Avatar
Join Date: Apr 2010
Location: Tennessee
Posts: 514
iTrader: (4)
I am having trouble imagining the fuel system having any effect on the tach. The tack is driven by the IC ignitor. I would definately test the pickup coils, and check all coil connections from the ignitor IC. I am not sure, and maybe someone with more knowledge on the subject will chime in soon, but I think the ignitor IC controls the ignition advance. If it is not receiving the rpm from the pickups, it will not advance the spark, allowing the engine to rev up. If all the wiring checks out, it could be a bad pickup or ignitor IC. Hopefully someone else will correct me if I am mistaken. But I do not think it will be a fuel related problem if your tach was dropping to zero.

~~C8> Ratt
'91 VN750 - Cosmic Splendor/Candy Wine
Done: Coastered, .020 ign., Iridiums, VM
Plexistar II, MCCT's, Relocated MOSFET
Next: LED's
Will Do: Horns, Shave(maybe)
ZCraggRatt is offline  
post #4 of 4 (permalink) Old 02-15-2011, 09:25 PM
Linkmeister Supreme
OlHossCanada's Avatar
Join Date: Aug 2008
Location: Lethbridge, Alberta, Canada
Posts: 7,960
iTrader: (8)
The fuel won`t affect the tach.

The tach sensor wire reads one of the front coil plug wires, so no spark to the plugs and no tach reading are related.


1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15

OlHossCanada is offline  
Sponsored Links


Quick Reply

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


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

Email Address:


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