20 minute sputter - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 05-14-2007, 10:01 PM Thread Starter
 
Join Date: May 2007
Posts: 5
iTrader: (0)
 
20 minute sputter

>I just bought a motorcycle on ebay. It paid too much. It was supposed
> to run great. It doesn't. I try to take it to work. But I don't trust it. It just dies after about 15 minutes of driving and doesn't seem to have enough umph to restart. Just before it dies, sometimes it backfires. I replaced the battery and went thru a tank of new gas. the plugs are supposed to be new and all the fluids replaced. Its a vn750 '86 kawasaki vulcan with 10.000 miles on it. A
> dealer said this could cost 600-800 to diagnose/fix because its a
> labor intensive problem.

I have heard that it might be a bad ground. But where to I check this exactly? I have also heard it may be a stator. Someone said you have to pull the engine to get one of those in. Is that true? If I put a voltmeter on my battery terminals I get 12.8 volts at idle. I get 12.9 if I rev the engine. Does this sound right?
bradweist is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 05-14-2007, 10:26 PM
 
Join Date: Apr 2007
Posts: 43
iTrader: (0)
 
I just bought an 86 and have also been having some problems with it not wanting to start. Its really hit and miss. Sometimes it starts right up, other times it just sits there and cranks forever. It seems to have the most problems right as its starting to warm up. When its cold, it starts. When its hot, it starts. Its in that 5-10 minute warm up timeframe that it wants to stall and then won't restart.
The_Spaceboy is offline  
post #3 of 7 (permalink) Old 05-14-2007, 11:19 PM
HAWK
 
Ccspinner's Avatar
 
Join Date: Feb 2006
Location: Chicago land
Posts: 2,576
iTrader: (9)
 
Send a message via Yahoo to Ccspinner
Have you checked the charging system?
Sounds like you may have a Stator or Regulator Rectifier going or gone.
Look in the Vulcan Verses for a way to check the Charging system.
The Ground people have talked about is where the battery ground attaches to the fraim, it has been known to crack.
I would recomend putting Sea Foam in the tank to help cleen the fuel system.
You can find it at most auto stores.
hope this helps

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
Ccspinner is offline  
 
post #4 of 7 (permalink) Old 05-14-2007, 11:21 PM
Members who have donated towards server costs
 
Crobins365's Avatar
 
Join Date: Jul 2006
Location: Kennett Square, PA
Posts: 3,505
iTrader: (48)
     
Quote:
Originally Posted by bradweist View Post
>I just bought a motorcycle on ebay. It paid too much. It was supposed
> to run great. It doesn't. I try to take it to work. But I don't trust it. It just dies after about 15 minutes of driving and doesn't seem to have enough umph to restart. Just before it dies, sometimes it backfires. I replaced the battery and went thru a tank of new gas. the plugs are supposed to be new and all the fluids replaced. Its a vn750 '86 kawasaki vulcan with 10.000 miles on it. A
> dealer said this could cost 600-800 to diagnose/fix because its a
> labor intensive problem.

I have heard that it might be a bad ground. But where to I check this exactly? I have also heard it may be a stator. Someone said you have to pull the engine to get one of those in. Is that true? If I put a voltmeter on my battery terminals I get 12.8 volts at idle. I get 12.9 if I rev the engine. Does this sound right?

If you rev the engine, your voltage should go up to 14 or so, but the 12.8 v is a promising reading. What's your reading after you've been riding for a bit (as in, when it dies)? It may well be a bad ground - unhook the negative battery terminal, and then check to see that your engine ground lead is clean, tight, and really making contact with metal on the frame (not paint). It should be located on the left side of your bike (facing forward), on the frame, just above the fuse box.


Don't take it to a dealer until everyone here's walked you through some paces. And if it's a charging problem, you've got plenty of company here - we could maybe do a group engine pull!!

C
Crobins365 is offline  
post #5 of 7 (permalink) Old 05-15-2007, 07:37 AM
Senior Member
 
BigT's Avatar
 
Join Date: Mar 2007
Location: Houston, TX
Posts: 236
iTrader: (1)
 
I had similar issues with my '00. It didn't backfire, but it died a couple of times on me and once it wouldn't re-start after stopping at a store on the way to work.

I ended up only needing a regulator instead of a r/r and stator. There's some good info about checking the charging system with a multimeter in the verses. If you have problems (like I did) there are a lot of folks here that can walk you through it. Like everyone else already said, definitely check all of your connections and make sure that they're clean. If your bike has a wet cell battery, ckeck the vent tube and all parts below the vent tube and see if something has corroded (you'll want to install a maint. free AGM battery ASAP).

Once you get the charging system working right, you'll love the bike. Mine started acting up right after I bought it and I work with the previous owner. The bike never gave him any problems and he offered to give me my money back but I was already bitten by the vulcan bug. I'm glad now that I stuck it out and I love my ride.

Good luck.

I smile 'cause I don't know what the h*ll is going on.
BigT is offline  
post #6 of 7 (permalink) Old 05-15-2007, 08:23 AM
 
Join Date: Feb 2006
Posts: 227
iTrader: (0)
 
When I bought my 86, she was in about the same shape. A new maintenance free battery fixed alot of the starting problems.
wwmkwood is offline  
post #7 of 7 (permalink) Old 05-15-2007, 09:46 AM
Members who have donated towards server costs
 
93VN750's Avatar
 
Join Date: May 2006
Location: Tampa, Florida
Posts: 1,766
iTrader: (2)
 
Send a message via Skype™ to 93VN750
If your battery voltage does not go over 12.9Vdc when you rev it up, there is definitely a charging system problem there. After you have checked all the wiring and its good, start with the r/r then the stator.

As previously suggested, check the versus for the test procedure.

My behaved the same, replace the battery, r/r and stator, works fine now.

Jon

93VN750, under re-construction
vn750.com Member # 828

Rick's Stator and R/R
MF AGM Battery
Coastered
Degoated
Shaved & Jetted
Iridium's
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
Stainless Steel Brake Lines
Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)
93VN750 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