Which Pulser Fires Rear Cylinder? - 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 05-10-2013, 02:15 PM Thread Starter
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Which Pulser Fires Rear Cylinder?

Well, it's *finally* riding season again and I couldn't wait to put some miles on the bike to verify my work over the winter. As some of you may recall, I had a problem back in December with wires breaking off my ignition pickups while performing the pickup mod. Acquiring a used set of pickups and splicing them into the existing assembly with quick-connects brought the engine back to life and all was good... until the other day on my ride home from work, when the rear cylinder went on vacation. *grumbles* I determined that there was no spark to either plug on the rear cylinder. I pulled the stator cover off to see if anything came unplugged, all looked in order. So I ran the engine for a moment with the cover off (risking some oil spray), lo and behold both cylinders fired right up *weird*. Put the cover back on and ran it again, only to see the rear cylinder quit again.

Obviously, one of those 'good used' pickups didn't last very long (fell prey to what I constantly battle my boss with... 'junkyard parts tend to be just that, JUNK!') Now, I know I should plunk down the $100+ for a new set of pickups... but with an extra Benjamin being hard to come by, I'd like to try my hand at concentrating on the one offender right now.

Thanks everyone for your knowledge and input!

1992 Vulcan 750 - Mostly Stock (for now)
* YUASA AGM Battery - YTX14AHL-BS
* Cleaned Master Cylinder, Flushed Front Brakes W/Extra-Dry DOT4
* Ignition Pick-Up Coil Mod (With Quick-Connect In-Line Terminals)
* Chrome Coolant Reservoir Cover & Oil Filter
* Muzzy's Aluminum Radiator Fan Blade
* Replacement Drive Shaft - Lubed Splines & Final Drive
* New Clutch Handle (Straightened Old, Kept As Spare)

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post #2 of 9 (permalink) Old 05-10-2013, 03:18 PM
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are you sure the wires are not shorting to the cover when the cover is replaced?

I would inspect each wire carefully to be sure.....maybe even cover them in silicone or something before replacing the cover. a pinhole in the insulation would jump the signal to the grounded case and cause the coil to not get sufficient signal to fire.

just sayin......
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post #3 of 9 (permalink) Old 05-10-2013, 04:56 PM Thread Starter
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Quote:
Originally Posted by kc2dgq View Post
are you sure the wires are not shorting to the cover when the cover is replaced?

I would inspect each wire carefully to be sure.....maybe even cover them in silicone or something before replacing the cover. a pinhole in the insulation would jump the signal to the grounded case and cause the coil to not get sufficient signal to fire.

just sayin......
That was my original thought... that the shrink tube insulation I used had ridden along the wire, exposing the terminals. Sadly though, such isn't the case *that would've been too easy to remedy, resulting in a boring life for me* LOL!

1992 Vulcan 750 - Mostly Stock (for now)
* YUASA AGM Battery - YTX14AHL-BS
* Cleaned Master Cylinder, Flushed Front Brakes W/Extra-Dry DOT4
* Ignition Pick-Up Coil Mod (With Quick-Connect In-Line Terminals)
* Chrome Coolant Reservoir Cover & Oil Filter
* Muzzy's Aluminum Radiator Fan Blade
* Replacement Drive Shaft - Lubed Splines & Final Drive
* New Clutch Handle (Straightened Old, Kept As Spare)

Patriot Guard Rider

~Don't ask me how I know... I just know~
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post #4 of 9 (permalink) Old 05-10-2013, 07:55 PM
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There was a post not too long ago, someone used a magnifying glass to find a small crack in the insulation on a pickup lead. He covered the crack with liquid tape and it was running again.

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post #5 of 9 (permalink) Old 05-11-2013, 12:02 AM
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The rear runs off of the upper pickup coil....if your rear cyl is crapping out now and then, first, check the gap....second, either replace the individual coil, or do a resistance test from the coil to where it connects (test the wires)....they commonly crack or get burned out....happend to me with them AND the 3 yellows coming fron the stator....I snipped, soldered, and replaced and rerouted all....I also went up one gauge on the wire....



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post #6 of 9 (permalink) Old 05-12-2013, 07:07 PM Thread Starter
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Thank you, Wolfie! That's exactly what I was looking for

1992 Vulcan 750 - Mostly Stock (for now)
* YUASA AGM Battery - YTX14AHL-BS
* Cleaned Master Cylinder, Flushed Front Brakes W/Extra-Dry DOT4
* Ignition Pick-Up Coil Mod (With Quick-Connect In-Line Terminals)
* Chrome Coolant Reservoir Cover & Oil Filter
* Muzzy's Aluminum Radiator Fan Blade
* Replacement Drive Shaft - Lubed Splines & Final Drive
* New Clutch Handle (Straightened Old, Kept As Spare)

Patriot Guard Rider

~Don't ask me how I know... I just know~
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post #7 of 9 (permalink) Old 05-13-2013, 12:23 AM
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So....did it work for ya ????....Inquiring Wolves wanna know, lol....



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post #8 of 9 (permalink) Old 05-15-2013, 01:52 PM Thread Starter
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Yes, that particular problem is solved I managed to grind away enough of the plastic with a pencil grinder, exposing the brass terminals in the pick ups that the original wires are crimped into, allowing me to test continuity and solder new wires onto them.

I may be starting a new thread soon, however. My VN750 has always been plagued with an intermittent laborious cranking condition. Never seemed to have quite enough cranking power to start/restart the engine easily. I found all kinds of possible causes, from rusted connections at the starter relay to dirty/weak ground and starter cable connections. Correcting all of those heavy cable connections only made a marginal difference, and doing voltage drop tests from stem to stern revealed great continuity. I began to suspect a faulty starter motor... which has been confirmed this morning, as it has virtually quit cranking altogether! If I tap on the starter itself, it'll crank just enough to fire up the engine. *I swear, this bike has been an adventure similar to owning a boat... always something broken*

1992 Vulcan 750 - Mostly Stock (for now)
* YUASA AGM Battery - YTX14AHL-BS
* Cleaned Master Cylinder, Flushed Front Brakes W/Extra-Dry DOT4
* Ignition Pick-Up Coil Mod (With Quick-Connect In-Line Terminals)
* Chrome Coolant Reservoir Cover & Oil Filter
* Muzzy's Aluminum Radiator Fan Blade
* Replacement Drive Shaft - Lubed Splines & Final Drive
* New Clutch Handle (Straightened Old, Kept As Spare)

Patriot Guard Rider

~Don't ask me how I know... I just know~
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post #9 of 9 (permalink) Old 05-15-2013, 07:36 PM
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But hay....ya learned a buncha stuff, and were able to share with others too....thats half the journey....the other half is riding the snot outta it !!!!



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