My VN 750 is acting strange - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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post #1 of 20 (permalink) Old 04-14-2009, 03:04 AM Thread Starter
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My VN 750 is acting strange

Hi,

I went out for a ride yesterday. Never had problems with my bike. But I noticed something when I started her the first time. I had to push the start button twice to get her fired up, like there was not enough power the first time. This happened several times during the day. But the last time, when I was almost home, I couldn't get the bike started anymore. I had to use starting cables and a second battery to start the bike.

The battery is one season old and full with liquid (don't know whats inside). It's not a maintenance free battery. I'm not an expert, but I do want to know what's wrong with my bike. Can someone help me with this? I need a step-by-step guide to check things and how to do it. Maybe it's the stator (still positioned under the battery), but it can also be the dynamo. I really don't know what is wrong.

Willem
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post #2 of 20 (permalink) Old 04-14-2009, 03:14 AM
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without further testing im not sure do u have a volt meter? first things first charge your battery... then its time to do a couple quick tests one start bike and hold hand in front of head light when u rev it up does the light get brighter? 2. volt meter across the batt whats the batt volt not running and whats the voltage of the bike when its at idle and when its at 3000 rpm??? a couple more extensive test to come but that should be a good start... did u start with a freshly charged battery? and i do know the not mf batts are lucky to get more then a year out of them ....



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post #3 of 20 (permalink) Old 04-14-2009, 03:36 AM
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Quote:
Originally Posted by gwbosma View Post
Hi,

I went out for a ride yesterday. Never had problems with my bike. But I noticed something when I started her the first time. I had to push the start button twice to get her fired up, like there was not enough power the first time. This happened several times during the day. But the last time, when I was almost home, I couldn't get the bike started anymore. I had to use starting cables and a second battery to start the bike.

The battery is one season old and full with liquid (don't know whats inside). It's not a maintenance free battery. I'm not an expert, but I do want to know what's wrong with my bike. Can someone help me with this? I need a step-by-step guide to check things and how to do it. Maybe it's the stator (still positioned under the battery), but it can also be the dynamo. I really don't know what is wrong.

Willem
Check and clean All battery and ground connections.

Get rid of the battery you have and replace with an AGM MF battery, Link below.

Replace your spark plugs with NGK DPR7EIX-9 #7803 Irridium Plugs!!!

One season is about all you will get from a standard wet cell battery!

Battery

http://cgi.ebay.com/ebaymotors/ws/eB...3AIT&viewitem=

you will recieve in three days.

OR

http://www.batterymart.com/p-Big-Cra..._campaign=Base

They are made by the same company, East Penn Mfg.


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
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PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
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CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

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post #4 of 20 (permalink) Old 04-14-2009, 04:01 AM Thread Starter
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I put in the iridium spark plugs last season. Two weeks ago everything was fine and I drove more than 260 kilometers on one day without starting problems. I will try the headlight test this evening. What does this test say when the light gets brighter? I don't know if I can get the mentioned maintenance free battery, because I'm living in Holland. Are there other mf batteries that I can get in Holland suited for the VN750? I now have a Yuasa battery (not mf). When I want a mf Yuasa, what is the right type?

Last edited by gwbosma; 04-14-2009 at 04:12 AM.
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post #5 of 20 (permalink) Old 04-14-2009, 05:09 AM
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Quote:
Originally Posted by gwbosma View Post
I put in the iridium spark plugs last season. Two weeks ago everything was fine and I drove more than 260 kilometers on one day without starting problems. I will try the headlight test this evening. What does this test say when the light gets brighter? I don't know if I can get the mentioned maintenance free battery, because I'm living in Holland. Are there other mf batteries that I can get in Holland suited for the VN750? I now have a Yuasa battery (not mf). When I want a mf Yuasa, what is the right type?
You want a sealed MF AGM battey, here is a link close to home.

http://www.tayna.co.uk/YTXL-BS-Westc...ery-P3386.html


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote
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post #6 of 20 (permalink) Old 04-14-2009, 12:37 PM Thread Starter
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I just started the bike and it fired up without a problem. When I look at the headlight, it gets a tiny bit brighter than when the engine runs idle. I'll buy a volt meter to get some numbers. What does the headlight say?

EDIT: I know have a multimeter and tested the battery. When the engine runs at 3000 rpm, the voltage is 13.5 to 13.7. When the bike is off, the battery volt slowly goes from over 12 volts to lower volts. In about an hour, it gets to below 12 volts (11.80).

Last edited by gwbosma; 04-14-2009 at 03:25 PM.
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post #7 of 20 (permalink) Old 04-14-2009, 08:20 PM
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The voltmeter says get a maintenance free- absorbed glass mat battery. A fully charged battery at rest should be at 12 - 12.5volts.

Gordon

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
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https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html

Last edited by OlHossCanada; 06-01-2009 at 11:09 PM. Reason: correct voltage
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post #8 of 20 (permalink) Old 04-14-2009, 09:14 PM
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Your battery at rest should at least be over 12 volts always. My 10-month old battery is typically 12.8 when off, and goes to 13+ when idling, higher at 3000 rpm. Even if things are going well right now, please be smart and buy a glass mat maintenance free battery properly sized for your bike. Then fully charge it prior to installing. Your battery is probably going to die soon. Even if it still has some life to it, you don't want to be stuck somewhere without power.

Rubyrick

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post #9 of 20 (permalink) Old 04-14-2009, 09:58 PM
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I'd like to put my.02 in on this one if you continue to run tha battery in your bike and it in that low of a state of charge you will be putting an undue amount of work on what is a weak charging system already and could cause R/R or stator failure,It is the old pay now or pay a lot more later problem,they are right buy yourself a new battery, preferably a maintenance free battery and use your old one for the mower or something else we don't need,Denny




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post #10 of 20 (permalink) Old 04-15-2009, 02:12 AM Thread Starter
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The next morning:

Battery is at 11.74 volt.

To make sure its the battery, is there an other way to check it?

What does the headlight say? Is it good when it shines even a bit when I higher the rpm?

Thanks for all the help!
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