Slow Turnover - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
Includes Electrical mods, Lights, Stator,
Rectifier, Diagrams, etc

 2Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 16 (permalink) Old 05-01-2020, 04:59 AM Thread Starter
Junior Member
 
Join Date: Apr 2020
Posts: 6
iTrader: (0)
 
Slow Turnover

Hi
I have an issue with my 1985VN 700 the engine is slow turning over I have replaced the battery and charged it, checked the starter motor and also tried a replacement, engine turns over but it sounds as if the battery is flat,
Can I have any ideas you may have
Many Thanks
Glyn
Glyn Jones is offline  
Sponsored Links
Advertisement
 
post #2 of 16 (permalink) Old 05-01-2020, 05:26 AM
Senior Member
 
Join Date: Nov 2015
Location: Pittsburgh, PA
Posts: 1,213
iTrader: (0)
 
Garage
Could be a bad ground connection? Check the negative battery terminal's connection to the frame.

Could also be a bad starter solenoid or connection around there. Try jumping power directly to the starter to see if it cranks more powerfully when bypassing the rest of the bike's electrical system. If that works ok, then do the same test with the solenoid.

It does happen that replacement parts are defective, too. Is the new battery for sure good? AGM type?
Glyn Jones likes this.

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 online now  
post #3 of 16 (permalink) Old 05-01-2020, 05:36 AM Thread Starter
Junior Member
 
Join Date: Apr 2020
Posts: 6
iTrader: (0)
 
Hi Thorn
Tried putting charger directly to starter motor and earthed on frame noting till I pressed starter then the same just turns slowly
Glyn Jones is offline  
 
post #4 of 16 (permalink) Old 05-01-2020, 06:21 AM
Senior Member
 
Join Date: Nov 2015
Location: Pittsburgh, PA
Posts: 1,213
iTrader: (0)
 
Garage
A charger won't have enough amps to properly drive the starter. You'd need to jump from the battery.

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 online now  
post #5 of 16 (permalink) Old 05-01-2020, 09:06 AM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 7,265
iTrader: (5)
   
Quote:
Originally Posted by Thorn View Post
A charger won't have enough amps to properly drive the starter. You'd need to jump from the battery.
+1 to what he said.

Sounds like not enough amps in the battery, or a problem with the starter assuming enough amps are getting to it.

The battery should load test at least 200-250 amps.

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 #6 of 16 (permalink) Old 05-01-2020, 12:07 PM
Senior Member
 
ubertalldude's Avatar
 
Join Date: Jun 2016
Location: NE Florida
Posts: 729
iTrader: (0)
 
My favorite way to rule out electrical issues is to "jump" the bike with a car battery WITHOUT THE CAR RUNNING. They typically have way higher cranking amps and capacity, just be careful not to kill your car's battery

If your bike cranks right away, you can pretty safely rule out an electrical/wiring issue. If it is still slow, you've got some digging to do.

As a curiosity, what kind of battery did you get? These bikes don't like wet cell "standard" batteries, they start a lot better with an AGM battery
Spockster likes this.

Earshave+Rejet (38/135) – NGK Iridiums – MCCT Conversion – Slipstreamer S03 Windshield – Custom Extended Backrest – Custom Highway Bars – MOSFET R/R – LED Underglow – Volt+USB In-Dash – Two-Wire & Blue-Wire Mod – Satin Black Engine Paint – Dampers Parts - Jets: Main=99101-393(#132 stock)/Pilot=n424-22 Pilot(#38 stock)
ubertalldude is offline  
post #7 of 16 (permalink) Old 05-01-2020, 12:48 PM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 7,265
iTrader: (5)
   
Quote:
Originally Posted by ubertalldude View Post
My favorite way to rule out electrical issues is to "jump" the bike with a car battery WITHOUT THE CAR RUNNING. They typically have way higher cranking amps and capacity, just be careful not to kill your car's battery

If your bike cranks right away, you can pretty safely rule out an electrical/wiring issue. If it is still slow, you've got some digging to do.

As a curiosity, what kind of battery did you get? These bikes don't like wet cell "standard" batteries, they start a lot better with an AGM battery
Great tip. The starter won't take more amps than it needs, you can hook a 12v bulldozer battery to it and it won't hurt a thing.

AGM - best battery available so far. Not sure about lithium-ion, haven't used one. Wet cells are dead. AGM is not the same as a gel battery, it's better.

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 16 (permalink) Old 05-01-2020, 04:09 PM
Super Moderator
 
Join Date: Feb 2013
Location: SW Florida
Posts: 2,526
iTrader: (5)
 
a lithium ion battery would be even better than AGM, according to the specs, performance, ect.. problem is lithium ion batteries require very specific charging and discharging protocols and protections, other wise you get either very poor life span, or even yet, turn into a fire bomb.

the charging system in the vn750 is in NO way capable of handling a Lithium battery. so we have AGM which is nearly as resilient as the standard old flooded lead acid

2005 VN750

Sold 11-27-17
michiganteddybear is online now  
post #9 of 16 (permalink) Old 05-02-2020, 10:28 AM Thread Starter
Junior Member
 
Join Date: Apr 2020
Posts: 6
iTrader: (0)
 
Hi, tried jump starting from car battery still only turning over slowly sounds like flat battery ?? But car battery is fully charged
Any other thoughts
Thanks
Glyn Jones is offline  
post #10 of 16 (permalink) Old 05-02-2020, 10:42 AM
Old Fart
 
Knifemaker's Avatar
 
Join Date: Jun 2004
Location: Catawissa, MO
Posts: 11,786
iTrader: (4)
     
Garage
Well if it’s still turning over slow from a fully charged car battery, I’d say the starter might just be bad. Unless there’s something wrong internally with the starter gears or motor itself.
Have you been able to start the bike at all?

If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
http://www.flickr.com/photos/knifemaker1954/sets/
Knifemaker 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