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Carbs and Fuel System
From the gas tank to the carbs
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post #1 of 24 (permalink) Old 10-10-2006, 12:41 PM Thread Starter
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No Start

Ok here goes 1998 VN750 21k miles. New stator, new R/R, new wire harness
and new plugs. Carbs removed and cleaned.......Will not start !!! Ran before
stator replacement. Cranks strong w/mf battery. Spark from the plugs is not
fat blue spark one would expect. Prior to all the work being done plugs in the
front cyl. were sooty black and could not keep bike at idle. Gas tank has been
drained and cleaned along with the petcock.
Before I head to the HD dealer ( not really !) I will put the question to you
as to what I should do next....really losing patience TIA
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post #2 of 24 (permalink) Old 10-10-2006, 12:57 PM
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Sounds like somewhere in the wire harness replacement, something didn't get hooked up correctly or isn't making good contact. Possibly at the IC ignitor module or at the coils. Might be a dirty ground somewhere in the ignition wiring as well. I'd work backwards from the coils and trace it down that way. If it ran before, it has to be something that happened during the electrical equipment replacement. My .02.

Jim W
93 VN 750 "Ursula"
Moved R/R 08Sep06
R/R rewire 17Feb07
New R/R, Installed 14Jun08
New Stator installed 10 Jun08
Maintenance Free Battery 12Jan08
21480 Miles
VROC #8542
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post #3 of 24 (permalink) Old 10-10-2006, 01:05 PM Thread Starter
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I've been thinking the coils may be the cause. Could have the red and green wires misplaced on them. The manual does not indicate the terminals for red and green.
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post #4 of 24 (permalink) Old 10-10-2006, 01:06 PM
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Could be. If the spark is weak, that might be a good place to start.

Jim W
93 VN 750 "Ursula"
Moved R/R 08Sep06
R/R rewire 17Feb07
New R/R, Installed 14Jun08
New Stator installed 10 Jun08
Maintenance Free Battery 12Jan08
21480 Miles
VROC #8542
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post #5 of 24 (permalink) Old 10-10-2006, 01:12 PM Thread Starter
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Yeah brother it's extremely disappointing to have put this much work into the bike and get these results.
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post #6 of 24 (permalink) Old 10-10-2006, 01:23 PM
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I had to take mine in to a mech after I rebuilt the engine because it wouldn't start. Turned out that somewhere during the engine reinstall in the frame, the carbs got bumped out of their boots just enough to stop the engine from running. A casual inspection didn't reveal the problem so I had no idea. The mechs fumbled around for about 4 hours before discovering the problem. Fortunatly they only billed me for 2 hours. At $70/hour, it was still expensive. It was a simple problem but it took a fresh set of eyes on it to find. Your possible crossed wires on the coil are probably on the right track.

Jim W
93 VN 750 "Ursula"
Moved R/R 08Sep06
R/R rewire 17Feb07
New R/R, Installed 14Jun08
New Stator installed 10 Jun08
Maintenance Free Battery 12Jan08
21480 Miles
VROC #8542
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post #7 of 24 (permalink) Old 10-10-2006, 01:44 PM Thread Starter
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My God those boots are a PITA. After I figure out this problem those ears are
the next project.
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post #8 of 24 (permalink) Old 10-10-2006, 03:17 PM
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Also, is there gas in the carbs ?

Ron from Jersey
2005 VN750
HellFire windshield
Kaw extended backrest
Cobra exhaust
Re-located stator wires
Side bags
15,000 Miles July/2012
It's PAID OFF ! May 2009
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post #9 of 24 (permalink) Old 10-10-2006, 03:33 PM Thread Starter
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Oh yes you can smell it after a few cranks.
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post #10 of 24 (permalink) Old 10-10-2006, 05:47 PM
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Does it backfire? Could be the flywheel thingy with the magnets on it, or the pickup coils are reversed.

Looking at the wiring diagram, one of the coils gets red and green, the other gets black and green. It doesn't matter which terminal on the coil gets red or green, or which terminal gets black or green.

2000 A16
Drilled baffles
$65 leather saddle bags
Kuryaken grips
relocated R/R
de-badged
25,000+ original owner miles
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