Ok guys 13 volts when cranking - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 11 (permalink) Old 05-02-2015, 07:40 PM Thread Starter
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Ok guys 13 volts when cranking

My battery is bad but I have put a cranking battery charger on the bike to see if having the correct voltages would produce a blue spark. When I test the battery connection voltage with the charger it is producing 15 volts but once I hit the starter it drops down to 13 volts and also the spark is darker, it is still orange not blue.

Can the spark plugs go bad by just sitting for a few years? Any suggestions where to look next?

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post #2 of 11 (permalink) Old 05-02-2015, 07:50 PM
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Quote:
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My battery is bad but I have put a cranking battery charger on the bike to see if having the correct voltages would produce a blue spark. When I test the battery connection voltage with the charger it is producing 15 volts but once I hit the starter it drops down to 13 volts and also the spark is darker, it is still orange not blue.

Can the spark plugs go bad by just sitting for a few years? Any suggestions where to look next?
It's normal for the voltage to drop when current is drawn. I'd think if the no load voltage is 15v and it drops to 13 when the starter is engaged that's prob about right, since he starter draws a lot of current. What if you disregard the orange spark for now and see if you have other problems, like maybe fuel/mixture? When did the bike run last? Was it running when you got it and is it new to you?

"Katie"
2002 VN 750, stock except for accessories
Mustang seat
Super Bright LED brake strobe on trunk
About 25k miles
All drive train maintenance performed, drive shaft coupler replaced
Way more experienced at pulling VN 750 carbs than I ever wanted to be.
TOC ACCT rebuild kits installed
Pick up coil mod
Cooling system flushed, refilled with fresh coolant
Petcock rebuilt
VN sold, current steed Honda ST 1300
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post #3 of 11 (permalink) Old 05-02-2015, 08:07 PM Thread Starter
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When I got the bike 3 years ago it had sat for a few years before I got it. Just within the last 2 weeks I pulled the carbs and thoroughly cleaned them and put them back on the bike. The bike ran for the first time since I got the bike and would stay running until I shut off the bike. Then it wouldn't start again. That is when I noticed my spark isn't blue of which is optimal running spark.

I did however begin to think to play with the mixtures since I only turned the mixture screw out 2.5 times and that may be an issue. I am going to try that now.

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Richard
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post #4 of 11 (permalink) Old 05-02-2015, 11:16 PM
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Maybe check the voltage at positive side of the coil while cranking. Should also be an ohms test for the coils in the manual.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
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post #5 of 11 (permalink) Old 05-03-2015, 03:29 AM
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Are you using a new battery ?

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #6 of 11 (permalink) Old 05-03-2015, 07:12 AM
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You say it sat for a while. Was it protected from the weather? Have you checked compression? Could the cylinders have rusted while it was sitting?

"Katie"
2002 VN 750, stock except for accessories
Mustang seat
Super Bright LED brake strobe on trunk
About 25k miles
All drive train maintenance performed, drive shaft coupler replaced
Way more experienced at pulling VN 750 carbs than I ever wanted to be.
TOC ACCT rebuild kits installed
Pick up coil mod
Cooling system flushed, refilled with fresh coolant
Petcock rebuilt
VN sold, current steed Honda ST 1300
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post #7 of 11 (permalink) Old 05-03-2015, 08:28 AM Thread Starter
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no the compression is good. The bike was inside when it sat up. There is no rust on the bike except for the instrument cluster housings, the rest of the bike is clean.

I am thinking it possibly could be in the mixture ratio or the coils/wires are weak and or a combination of both giving me this issue. I ran the bike in the buikding for about 5 minutes twice lastnight and as long as it ran, it ran perfectly so it makes me think the mixture is correct. The bike would idle very low and not shut off. Just when I shut it off, it won't start back.

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Richard
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post #8 of 11 (permalink) Old 05-03-2015, 09:45 AM
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Quote:
Originally Posted by mrseedsower View Post
no the compression is good. The bike was inside when it sat up. There is no rust on the bike except for the instrument cluster housings, the rest of the bike is clean.

I am thinking it possibly could be in the mixture ratio or the coils/wires are weak and or a combination of both giving me this issue. I ran the bike in the building for about 5 minutes twice last night and as long as it ran, it ran perfectly so it makes me think the mixture is correct. The bike would idle very low and not shut off. Just when I shut it off, it won't start back.
Sounds like a Hot Start issue..... Perform the "Pick-Up Coil Mod"

Also, suggest you replace the Spark Plugs and Spark Plug wires

WilliamTech

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #9 of 11 (permalink) Old 05-03-2015, 10:29 AM
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Yes pick up coil mod solved the hot start issue for me

It is what it is.
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post #10 of 11 (permalink) Old 05-03-2015, 03:27 PM Thread Starter
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I did the coil mod 2 years ago. Spark plug wires and spark plug is next. Where do I get the wires and what kind of spark plugs do you recommend?

Grace and Peace to you!
Richard
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