engine misses under load - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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post #1 of 21 (permalink) Old 08-18-2009, 03:17 PM Thread Starter
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engine misses under load

Engine misses after .5 mile at 140. Rear coil puts out 30,000 volts at right spark plug wire, and 20,000 volts at left spark plug wire. Why?
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post #2 of 21 (permalink) Old 08-18-2009, 03:18 PM
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140 kph?

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post #3 of 21 (permalink) Old 08-18-2009, 04:20 PM
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yeah it's got to be 140kmh

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post #4 of 21 (permalink) Old 08-18-2009, 06:54 PM
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that doesn't sound right...but my guess is becasue one side burns fuel and the other burns exhaust gases...some one else jump in on this one plz
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post #5 of 21 (permalink) Old 08-19-2009, 11:40 PM
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Maybe you have a faulty plug wire? Partially broken and higher resistance? I`m just guessing.
Does the coil have separate windings for each wire? That could account for different output. If there is only one set of windings with two high voltage outputs, a faulty plug wire would seem the most likely culprit, IMHO.

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post #6 of 21 (permalink) Old 08-20-2009, 02:30 AM
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Not that I am an expert, but just after gathering info from the internet..

How was that 20/30kV measured? With the engine running that sounds way too high, the spark should occur below 20kV.

The coil only has one 'floating' secondary winding. The high voltage to the other plug is positive and to the other negative.

Under heavy load the required voltage is higher than under normal load. If you have bad plug wires or boots, you may have arcing to ground and no spark under heavy load. So a second vote from me to the diagnosis of OlHoss.
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post #7 of 21 (permalink) Old 08-20-2009, 12:13 PM
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Quote:
Originally Posted by Chuck Buhr View Post
Engine misses after .5 mile at 140. Rear coil puts out 30,000 volts at right spark plug wire, and 20,000 volts at left spark plug wire. Why?
My vote would have been a plug wire even before you mentioned the voltage.

With the bike running (and preferably cool) run your hand along the spark wires. When you find the bad spot, you'll know.

Also pull the wires and measure the length, then measure with a ohm meter. The wires should be the same resistance per foot (or inch)...... But my guess would be arching to ground because you have dual plugs per cylinder.

I'd like to know how you measured a 30k voltage!!?

P.S. Mine was at the boot where the wire runs in, arcing to the block. 5-6 turns of electrical tape around the bad spot should get you to the parts store no problem.
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post #8 of 21 (permalink) Old 08-20-2009, 01:33 PM
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Slim or anybody else, just how does the two plugs per cylinder work? I thought they both fired at the same time, both for fuel. If one is for fuel and one for exhaust, which one is which. Does marbeling come into play here at all?



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Replaced front side reflectors with LED reflectors
Added LED lights to bottom of front tubes
Polished front tubes
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Regapped pickups to snug .020
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Last edited by Reiki3; 08-20-2009 at 01:36 PM.
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post #9 of 21 (permalink) Old 08-20-2009, 05:12 PM
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Quote:
Originally Posted by Reiki3 View Post
Slim or anybody else, just how does the two plugs per cylinder work? I thought they both fired at the same time, both for fuel. If one is for fuel and one for exhaust, which one is which. Does marbeling come into play here at all?
They both fire at the same time, coil output should be the same. Replace your caps and wires.


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post #10 of 21 (permalink) Old 08-20-2009, 06:56 PM
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I did all that when I was having all my problems and is running fine now. I just didn't know how it worked with the two plugs.



2000 VN750
gray and black
13,265 when I picked it up


Relocated R/R
Marbled
Relayed coils
Volt meter (Relayed)
Blue accent lighting
Iridium plugs
Turn signal buzzer
Highway pegs
Heated grips
Fork bag
Auburn leather saddle bags
Clock
Replaced front side reflectors with LED reflectors
Added LED lights to bottom of front tubes
Polished front tubes
Sylvania H4ST
DEKA MF AGM ETX15L
Regapped pickups to snug .020
TOC ACCT springs

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