Lost tachometer and maybe a cylinder - Page 2 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
VN750 General Discussion

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post #11 of 18 (permalink) Old 07-25-2019, 07:09 PM
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yes the coils are the same

2005 VN750

Sold 11-27-17
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post #12 of 18 (permalink) Old 07-25-2019, 07:28 PM Thread Starter
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Quote:
Originally Posted by michiganteddybear View Post
check for bad connections under the left neck cover.. all the wiring for the handle bars and gauges have connections there.

while changing the stator itself will not effect ignition, a broken wire on the pickup coils could, and they are delicate. and you may have broken a wire while working on stator
It happened about 10 minutes into the ride so I'm assuming that's not it based on that
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post #13 of 18 (permalink) Old 07-26-2019, 12:15 AM
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Originally Posted by Chris Allunario View Post
Also the ground wire to the coil tested well to ground and I'm getting power at the red hot wire at the ignition coil
Red hot is good, but I think it's a little more complicated than 'the ground wire on the coil testing well to ground'. That (from what I can tell) is the trigger for the spark when there's a brief, solid path to ground. The CDI box controls that via capacitors/mosfets/magic whatevers, so a straight ohm test doesn't mean everything is working correctly. It's the fluctuation of voltage between +12 and ground on that wire that makes the tach work and the coil fire.

Most likely culprit, as MTB says, is the pickup coil or the wires between it and the CDI box.

Second most likely is the CDI box.

Coil is probably fine.

1992 US-nonCA * tuxedo mod * r/r relocated

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post #14 of 18 (permalink) Old 07-30-2019, 05:58 PM Thread Starter
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Quote:
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Quote:
Originally Posted by Chris Allunario View Post
Also the ground wire to the coil tested well to ground and I'm getting power at the red hot wire at the ignition coil
Red hot is good, but I think it's a little more complicated than 'the ground wire on the coil testing well to ground'. That (from what I can tell) is the trigger for the spark when there's a brief, solid path to ground. The CDI box controls that via capacitors/mosfets/magic whatevers, so a straight ohm test doesn't mean everything is working correctly. It's the fluctuation of voltage between +12 and ground on that wire that makes the tach work and the coil fire.

Most likely culprit, as MTB says, is the pickup coil or the wires between it and the CDI box.

Second most likely is the CDI box.

Coil is probably fine.
How can I test those?
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post #15 of 18 (permalink) Old 07-31-2019, 03:04 AM
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Originally Posted by Chris Allunario View Post
How can I test those?
Pickup coils can be tested by checking the resistance between the two appropriate leads on the harness where it connects to the CDI box. 355 - 535 ohms. If you get an open line, you'll have to open the side cover and test between the terminals of the pickups themselves to see if the break is in the line or the coil is damaged.

If the pickups test OK, check the ignition coil primary 1.8-2.2 ohms, secondary 19-29Kohm. (did you already swap front and back successfully to rule out the coil?)

After that, the CDI box is sort of the only thing left, and there's not really a bench test for that component.

1992 US-nonCA * tuxedo mod * r/r relocated

Vulcan slang for newcomers
Service Manual Download
Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
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post #16 of 18 (permalink) Old 08-01-2019, 06:41 PM Thread Starter
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I swapped in a new coil and it did nothing. I am currently doing resistance tests. Apparently Kawasaki has a CDI tester but it's around $120-150 so I'd recommend going to a dealer to use it if anyone else needs to go this route

Last edited by Chris Allunario; 08-01-2019 at 06:46 PM.
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post #17 of 18 (permalink) Old 08-01-2019, 07:05 PM Thread Starter
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I think I found my problem. Grounded pickup coil. Everyone thanks so much for your help! I would have been dead in the water without you guys yet again. I love this community

Will the vn1500 pickup coil fit the vn750? If not I definitely ordered the wrong one

Last edited by Chris Allunario; 08-01-2019 at 07:41 PM.
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post #18 of 18 (permalink) Old 08-01-2019, 09:48 PM
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Glad you found the problem component. I'm not sure about the interchangeability of the 1500 coil.

1992 US-nonCA * tuxedo mod * r/r relocated

Vulcan slang for newcomers
Service Manual Download
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