Bike won't start but everything else will - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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post #1 of 28 (permalink) Old 09-03-2010, 06:38 PM Thread Starter
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Bike won't start but everything else will

So, I have a 96 Vulcan, and it won't start. I tested the compression. Good. Tested the gas flow. Good. Tested the spark plug. Nothing. From either one. But every other electrical system on the entire bike works. Even the starter clicks when i hit the button and the bike turns over. What is going on? I'm losing my mind, both from not knowing and from not riding!!
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post #2 of 28 (permalink) Old 09-03-2010, 07:11 PM
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Check the continuity on the black white wire from the ic 6 pin connector to ground. If you neutral switch is connected (bottom rear of engine with bullet connector with green wire) and neutral indicator working you should have less than 1 ohm resistance. also check power at red wire on coil in on position should be normal hot. Check all your fuses first.

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post #3 of 28 (permalink) Old 09-03-2010, 07:12 PM
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Check all your fuses first. Do a check for power to the Coils. Also it could be a weak battery, enough to crank the engine but not enough to fire the plugs.

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post #4 of 28 (permalink) Old 09-03-2010, 07:13 PM
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How many miles on the bike?
How much compression? You need a minimum of 129 psi according to the Clymer manual.

What voltage does the battery have now? At least 12.5 volts?
The vn750 really likes a fully charged battery to start.

If you need a new battery, get a Maintenance Free-AGM like this one:
http://cgi.ebay.com/ebaymotors/Deka-...item3eee173adb

You can have enough power to turn the engine over, but not enough left to make a good spark.

You say you got no spark from either plug. There are 2 in each cylinder.
Did you check one plug from each cylinder in order to test both ignition coils?

Do you have a service manual?
Here is a link to a free one:
http://www.tocmanufacturing.com/File...nd%20Parts.pdf

Use the procedure and specs there to check the resistance on both low and high voltage wires on both ignition coils.

Post back answers and I`m sure we can help you get her started.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
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TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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post #5 of 28 (permalink) Old 09-03-2010, 08:43 PM
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I have to thoughts.. one the diodes inside the JB that control the safety switches have failed (time for a new JB), Two your pick up coils aren't working to trigger the CDI Box. Just two more places to look.
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post #6 of 28 (permalink) Old 09-04-2010, 09:40 AM
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Like slim said your jb may be bad. When you check the continuity from my pprevious post you can confirm it

Harley sportster fenders
custom raked front end
custom exhaust
vn800 tank and guages
modified seat and recovered
rear frame chopped
custom wiring harness
airbox removed
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post #7 of 28 (permalink) Old 09-08-2010, 08:13 PM
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I have an 86 and im having the same problem with mine, its driving me absolutely crazy!! I keep running around in circles trying to figure it out only to end up back at square one and im running out of ideas!!
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post #8 of 28 (permalink) Old 09-08-2010, 09:18 PM
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Bad wiring, bad coil, bad pick-up, bad CDI unit................
If the bike turns over, then the main fuse is good.....therefore it's not a fuse.
Like others said, check the red wire for 12VDC at both coils and the CDI.
With the bike in neutral, check for continuity to ground of the black/white wire on the CDI. Also check continuity to ground of the black/yellow wire. Both of these wires should show continuity to ground.
pick-up coils test; pull the 4 pin connector apart and test resistance between B/Y and B and then between B/W and B/R. Should be around 350~550 ohms (I believe) Also check each of the 4 pick-up wires to ground. Should read inf.
Check resistance on coils: primary should be around 2 ohms and secondary should be 20k~30k ohms. Other than that, I would have to guess faulty CDI...........
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post #9 of 28 (permalink) Old 09-11-2010, 12:32 PM
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Send a message via AIM to Mazdaracer4fun Send a message via Yahoo to Mazdaracer4fun
USE A SPARK TESTER PPL!!! COME ON! they are cheap and VERY EASY TO USE! and very helpful!!! they can tell you if you are getting spark to the plugs! then after you figure that out you pull off plug wire and pop in a known good spark plug and touch it to frame/ground and see if you are getting it through the plugs.!!

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post #10 of 28 (permalink) Old 09-11-2010, 12:33 PM
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here is a pic of a spark tester that is super easy to use and super cheap!!!
http://www.hand-power-cutting-tool.c...ls/MTN8709.jpg

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