tach stops and bike starts to stall - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
Includes Electrical mods, Lights, Stator,
Rectifier, Diagrams, etc

 
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post #1 of 9 (permalink) Old 09-14-2012, 04:36 PM Thread Starter
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tach stops and bike starts to stall

I have what I think is an electrical problem. The bike runs along and suddenly the tach stops working. At the same time the engine starts sputtering and will not idle. It will run if I keep the throttle open but it feels like it is at half power, at best.

Rodd
'95
mine 05/09 19.5k; 11/09 30k
DONE
RAM Mount
Kuryakyn 12 volt socket
mirrors
paint Speedo and Tach
LED turn sigs
LED Brake
KAW luggage rack
Spiders Den Laptop Bag
KAW Saddlebag kit
Bridgestone Exedras
Protac Backrest
JJCyclepass
Coastered
Kuryakyn Levers, Grips & Throttle Boss
Spencer seat w/B&H cover
new ignition switch
handlebar clock
cup holder
Mutazu bags
LED Bulbs
V&H Cruzers
New Fuel Tank & Fenders
windscreen

TO DO
Hiway pegs
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post #2 of 9 (permalink) Old 09-14-2012, 05:01 PM
..have a vulcan good day!
 
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Quote:
Originally Posted by Rodd View Post
I have what I think is an electrical problem. The bike runs along and suddenly the tach stops working. At the same time the engine starts sputtering and will not idle. It will run if I keep the throttle open but it feels like it is at half power, at best.
Welcome to the forum.

tach problem is definitely electrical...there are two (?) connectors under the tank near the handlebars... I believe a 6 pin and a 8 or 9 pin which all your handlebar electrical passes through (including Ignition Switch connections). I suggest remove the tank, disconnect the connectors, cleaning thoroughly with contact cleaner and fine grit sandpaper or the like.

also,
Poor battery cable connections. Clean both battery posts/cables.
Clean each/every battery cable connections @ Starter Solenoid, Starter,
and two frame grounds. The 2nd one is on the bottom of the engine
(Starter ground) (engine is mounted with rubber mounts).

hope this helps
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 #3 of 9 (permalink) Old 09-14-2012, 06:00 PM
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I think the tach works off the front ignition coil ...... sounds like that is cutting out on you.

Do as WilliamTech said and pay close attention to the 12V connections to the front coil as well as the rest of the connections that might affect that coil. run it in the dark and see if you see any arcing as well.

check your plugs to see if they are fouled.
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post #4 of 9 (permalink) Old 09-14-2012, 06:25 PM
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check your battery ground.

02 honda sabre 1100
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post #5 of 9 (permalink) Old 09-26-2012, 02:46 PM
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mine did the same thing pull side panel off 3 of my wires were melted to the rectifier hoping it didnt mess anything up
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post #6 of 9 (permalink) Old 01-13-2013, 08:56 PM
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Hi Rodd,
could you tell me if you have managed to fix the bike cause I have somewhat the same problem....

89` Vulcan 750 - a.k.a HellRaiser
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post #7 of 9 (permalink) Old 01-13-2013, 09:09 PM
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Quote:
Originally Posted by malteser66 View Post
Hi Rodd,
could you tell me if you have managed to fix the bike cause I have somewhat the same problem....
If you have melted wires too then there was an over current condition, unless that rectifier gets that darn hot - I do not know. Good to think about what that may have caused the wires to melt.

Separate the wires and make sure they are in good shape, tape um back up and try that to see if your problem goes away.

Sorry for responding in lieu of the person you were asking but I am just saying what I would do

Good luck.
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post #8 of 9 (permalink) Old 01-13-2013, 09:28 PM
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Hi Mercury,

Thanks for joining in, I have checked the following: the wiring and there are no signs of melting, regulator/rectifier is a shindengen mosfet (no heat), checked grounds connections of battery, frame and engine, all seem ok too. spark plugs are ok,replaced both coils and ignitor box with spares, all fuses are good in fuse box, connections under tank are good too. bikes starts but tach does not work, engine does not fire properly, don`t know how to describe it but it stalls if i leave it to idle and seems like its out of breath but its something electrical. I am going to check the wiring to rectifier better.....

89` Vulcan 750 - a.k.a HellRaiser
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post #9 of 9 (permalink) Old 01-13-2013, 09:45 PM
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Have you tried going straight from the battery to the hot side of the coils. This will by-pass the key switch.

Something like this with out the relay.
https://www.vn750.com/forum/showthread.php?t=17276

02 honda sabre 1100
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