Ignition Coils, P/U Coils, Tach Signal??? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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post #1 of 9 (permalink) Old 05-09-2007, 12:50 PM Thread Starter
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Ignition Coils, P/U Coils, Tach Signal???

I've got the jumpy/intermittant tach Blues. Seems like I read on a post that a similar problem was cured by cleaning and re-seating the connectors. Trying to find where to look for and check any connector/connection probs. I'm confused as to which coil provides the tach signal. I see the pick-up coil on the Ayers fiche. Looks like it has 1 input connector and 2 output connectors but I'm having a time visualizing where these are on the bike or if this is where I should even be looking. Appreciate any tips or feedback. Right now, I sometimes get what looks like a good reading when I first start up but as soon as I give it throttle it drops off and then begins jumping. Some jumps seem to go with road bumps. Then, as it warms up, it often will start reading but at approx. 2x what's expected (9500~10K @70mph). If I decel it will drop off and go back to jumping. The bike runs great other than this.

86' Vulcan, Stock & Lovin it!
Stator, R/R, splines lubed, ACCT's repl. at 25,200
Just turned 29,000 mi.

95' Vulcan, all stock, 9,700 mi.

John Spangler
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post #2 of 9 (permalink) Old 05-09-2007, 12:58 PM
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I'll repost this here to keep everything in place..
I've added a color coded wiring diagram to the tech photos here
https://www.vn750.com/photopost/showp...to=827&cat=503
It may help.
Looks like the tach ties into Ignition coil #1 and the CDI
With this in mind you might want to have a look at the CDI and see if there is any corrosion or hot spots on it. A cruddy CDI could be giving the bad tach signals.

The #1 coil I "believe" is the rear coil judging from the position on the diagram, but I'd check the CDI first and it's connections also flip it over and check the back, sometimes bad spots on the diodes etc show up as hot spots there

Dianna
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2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
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OKVROC # 18 (H)
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post #3 of 9 (permalink) Old 05-09-2007, 03:52 PM Thread Starter
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That link didn't work. Also, CDI?? Thanks

86' Vulcan, Stock & Lovin it!
Stator, R/R, splines lubed, ACCT's repl. at 25,200
Just turned 29,000 mi.

95' Vulcan, all stock, 9,700 mi.

John Spangler
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post #4 of 9 (permalink) Old 05-09-2007, 03:58 PM Thread Starter
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Found the wiring diagram. Still working on CDI :-)

86' Vulcan, Stock & Lovin it!
Stator, R/R, splines lubed, ACCT's repl. at 25,200
Just turned 29,000 mi.

95' Vulcan, all stock, 9,700 mi.

John Spangler
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post #5 of 9 (permalink) Old 05-09-2007, 04:09 PM
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CDI - Capacitor discharge Igniter

It's the box (pn# 21119) in the following diagram
http://www.ronayers.com/fiche/400_04...0&parent=10700

The CDIs have been known to take some hits from battery acid spills (another good reason to have a maintenance free battery)

Dianna
Conway, AR
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)
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post #6 of 9 (permalink) Old 05-09-2007, 04:14 PM Thread Starter
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Got it. I have an MF Yuasa. Can you access through the seat or one or both the side panels?

86' Vulcan, Stock & Lovin it!
Stator, R/R, splines lubed, ACCT's repl. at 25,200
Just turned 29,000 mi.

95' Vulcan, all stock, 9,700 mi.

John Spangler
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post #7 of 9 (permalink) Old 05-18-2007, 01:18 PM
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Cool I will have to check mine.. Its just starting to kinda jump around on mine also.

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post #8 of 9 (permalink) Old 07-09-2007, 04:52 PM
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Quote:
Originally Posted by DeForestSD View Post
That link didn't work.
Try HERE.


AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC


"When life throws you curves,
Aim for the apex."

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post #9 of 9 (permalink) Old 07-09-2007, 07:26 PM Thread Starter
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Got it. Thanks!

86' Vulcan, Stock & Lovin it!
Stator, R/R, splines lubed, ACCT's repl. at 25,200
Just turned 29,000 mi.

95' Vulcan, all stock, 9,700 mi.

John Spangler
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