1985 700 starting problems - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 06-23-2010, 05:58 PM Thread Starter
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Question 1985 700 starting problems

Working on a new old bike
the bike starts and runs pretty good when it's cold
after 15 or 20 minutes shut it down and try to restart
it will not fire up leave it set a half hour or so it will fire and run good
I was thinking possibly a bad pickup coil? Or ignition coils?
Appreciate any information gary.
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post #2 of 12 (permalink) Old 06-23-2010, 08:44 PM
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Quote:
Originally Posted by discusgary View Post
Working on a new old bike
the bike starts and runs pretty good when it's cold
after 15 or 20 minutes shut it down and try to restart
it will not fire up leave it set a half hour or so it will fire and run good
I was thinking possibly a bad pickup coil? Or ignition coils?
Appreciate any information gary.
Common problem with the vn750. I saw your earlier post about having the carbs cleaned, and the choke not working. Have you resolved that problem yet?

Check the link in my sig line and especially note info about a MF-AGM battery, NGK IRIDIUM PLUGS, Part # DPR7EIX-9, Seafoam fuel condioner and the phantom out of gas syndrome (poogs). Also check fergy`s sig line for a link to regapping the ignition pick-up coils, and running a direct 12 volt line from the battery to the igniter terminals for a hotter spark.

I believe that we have recently concurred that the poogs is usually caused by a plugged vent or vent line. Remove seat and note black rubber hose attached to nipple on rear of tank. Follow hose down in front of rear tire, and put a piece of white paper towel under it. Open gas cap and note small vent between screws on hinge.

Spray some wd-40 through red straw into vent, and watch for crud flushing from bottom of hose onto paper towel. If it is a lot of black crud, the vent or hose was probably plugged. Alternately, use compressed air to blow line clear, if you have it.

If the vent is working properly you will hear a high pitched whistling noise as air enters the tank, replacing the fuel volume consumed after riding several miles.

Gordon

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

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post #3 of 12 (permalink) Old 06-23-2010, 08:57 PM
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Good suggestions! My 85 700 is a fussy B to start whe hot as well.
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post #4 of 12 (permalink) Old 06-23-2010, 11:24 PM
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Rebuild your starter motor if you have the hot start problem. Our starter motors are weak, and is in a bad place - behind the front wheel. You can find the rebuild kits on ebay for $25, do the work yourself or have a auto electric shop do the work.

DT

95 VN750 (eBay)31k+
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Pickup coil mod to .45mm
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post #5 of 12 (permalink) Old 06-24-2010, 12:13 AM
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Quote:
Originally Posted by dirtrack650 View Post
Rebuild your starter motor if you have the hot start problem. Our starter motors are weak, and is in a bad place - behind the front wheel. You can find the rebuild kits on ebay for $25, do the work yourself or have a auto electric shop do the work.

DT
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post #6 of 12 (permalink) Old 06-24-2010, 04:34 AM
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I did the advance the timing thing and it hot starts like when you breath on the start button...

2011 Suzuki VSTROM DL650 with ABS Purchased Jan 28 now with 39,000miles WRECKED JAN 12 ,2013
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Ventura guards
MadStadt mount
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Backoff
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Givi 52 topcase
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Headlight modulator
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Aquarium thermometer with forward probe mount
Admore LED Lighting/Givi E36N panniers
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post #7 of 12 (permalink) Old 06-24-2010, 05:47 AM
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Hmm. It seems to turn over fine, just a biach to catch and run. Its been my nemesis with this bike for the 8 opr so years ive had it. Figured it was just one of the common problems to live with on the Vulcan.
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post #8 of 12 (permalink) Old 06-24-2010, 07:53 AM Thread Starter
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Know I haven't gotten my carburetor choke fixed yet
but I do appreciate the suggestions and I will definitely try most if not all
this is my first Kawasaki so I do need a lot of input
this motorcycle I am working on has been setting since the mid-90s
it had been parked after a small accident so it's a work in progress
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post #9 of 12 (permalink) Old 06-24-2010, 12:05 PM
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Originally Posted by L2fish View Post
Hmm. It seems to turn over fine, just a biach to catch and run. Its been my nemesis with this bike for the 8 opr so years ive had it. Figured it was just one of the common problems to live with on the Vulcan.
It's your starter motor. Let me guess: your engine turns over when starting, but you get backfires, pops, and spits. You starter motor is draining too many amps to fire up the engine. Time for a starter rebuild.

DT

95 VN750 (eBay)31k+
GL1100 front fender
OEM engine guard
OEM high back rest
'V-Twin' HWY pegs
Black 750 Spectre handlebars
SunPro Volt Meter (Amazon)
Maier bug shield (JCW)
Bar Ends anti-vibe (JCW)
Emgo air filters
Tank bag-Eclipse
Tail bag-FroZone Cooler
Back Rest-Igloo 6 pak cooler
WalMart Saddle Bags
R/R Relocate
Dry Splines Lubed
AGM DieHard-Sears
Gutted Goat
Sporster XL Mufflers
LED's-stop,tail,turn,marker
Pickup coil mod to .45mm
Silverstar headlight
Rotella T6
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post #10 of 12 (permalink) Old 06-24-2010, 04:24 PM
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I won't argue about rebuilding the starter, as the case with many older bikes, that is probably a need. But I'm betting that you still have a wet cell battery in the bike (has a drain tube down the side--or should have anyway), or a pretty old MF battery. You need this anyway, even if you rebuild your starter, but go ahead and get yourself an AGM Maintenance Free battery. The AGM's have more cranking amps and don't spit boiled over acid all over your precious bike and corrode electronics and such, besides providing more amps to get decent fire from the plugs while turning over the bike. If you're getting any backfiring while trying to start the bike when its hot, its because you have a rich condition caused by weak spark.
My coil mod writeup doesn't have instructions to gap the pickup coils, but it does modify the wiring to the coils straight from the battery. It will boost the spark, especially on a bike that has questionable wiring to the coils. I did the coil mod and the r/r relocation at the same time and one or both cured my hot start problems.

I'm not saying not to rebuild your starter, just that you should have an AGM battery in there no matter what, so you might as well go ahead and get one.

Fergy
Kyle, TX VN750.com member #707 VROC#19556
2002 VN1500 Classic
Spline Lube Procedure, with photos, R/R Relocation and Coil Mod
Rusty Tank Cleaning!
Electrical Fault Finding Flowchart
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