Hitting bumps causing power failure - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 06-05-2014, 04:15 PM Thread Starter
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Hitting bumps causing power failure

Hi all,

I've been scouring the forums for possible solutions to a problem I started experiencing recently and can't seem to find anything that quite matches...

Yesterday while riding home, I hit a fairly standard-issue bump and immediately lost engine power; slowing very quickly while I attempted to restart. Other electrical seemed to be functional while the engine was dead - I could grind on the startor and even got it running again before I came to a complete stop. I believe I noticed the dash lights and similar were still functional when the engine power cut out. It started back up and promptly cut out again a few times, so I hopped off and took a look. I jiggled a few wires, disconnected and reconnected the plug caps and 2 visible wiring harnesses, and all was well for the rest of my 20 mile ride home.

It happened again today after traveling a bumpy section of road, so I'm thinking the bumps might not be a coincidence here? But I could be wrong. It seems more electrical than gas - but again, I could be wrong. When power is lost, it has cut out immediately and cleanly, and with some in-out-in-out choppiness before dying...

Where should I start checking for something loose or touching something it shouldn't be touching? Any help is greatly appreciated!

Thanks!
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post #2 of 9 (permalink) Old 06-05-2014, 04:31 PM
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Check all ground cables and make sure all connectors are clean and affixed securely.

Use electrical contact cleaner on connectors and pack them with dielectric grease to prevent moisture from getting back in.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
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V&H Cruzers
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Meanstreak Seat
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post #3 of 9 (permalink) Old 06-05-2014, 04:35 PM
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many have had odd or weird electrical gremlins that have been cured by cleaning the ignition switch as well

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post #4 of 9 (permalink) Old 06-05-2014, 04:36 PM
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Quote:
Originally Posted by michiganteddybear View Post
many have had odd or weird electrical gremlins that have been cured by cleaning the ignition switch as well
x2 on that!! Slim has a rebuild guide in the electrical section.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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post #5 of 9 (permalink) Old 06-05-2014, 07:30 PM
..have a vulcan good day!
 
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x2 on all advice given. Electrical.

"When power is lost, it has cut out immediately and cleanly, and with some in-out-in-out choppiness before dying...".

A long shot but, If it happens again, pop the gas cap to eliminate possibility of POOGS. (wouldn't hurt).

hth

'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!

Last edited by WilliamTech; 06-05-2014 at 07:33 PM.
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post #6 of 9 (permalink) Old 06-06-2014, 03:04 AM
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Possibly an issue in the ignition switch? Though I would still lean towards a loose ground wire somewhere.

......I'd rather wake up in the middle of nowhere then in any city on earth.

*2014 VN900 Custom (16,200 miles and counting)
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post #7 of 9 (permalink) Old 06-06-2014, 03:25 AM
..have a vulcan good day!
 
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Quote:
Originally Posted by Ndr View Post
Possibly an issue in the ignition switch? Though I would still lean towards a loose ground wire somewhere.
x2 ...my first thought & thinking it was already highly suggested....difficult to keep up with many threads....


'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!

Last edited by WilliamTech; 06-06-2014 at 03:28 AM.
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post #8 of 9 (permalink) Old 06-06-2014, 11:41 AM
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What they said. Sounds like loose ground somewhere.

Fergy
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post #9 of 9 (permalink) Old 06-06-2014, 03:32 PM
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x5 ignition switch. tie wrap the puck tightly together after you clean it.

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