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post #1 of 12 (permalink) Old 07-17-2009, 11:49 AM Thread Starter
 
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Unhappy Newby, hot start problem

I inherited an 86 vulcan from an uncle that never got it on the highway. Soon after he bought it, he got really sick and died from his illness. When I got the bike, I knew nothing of it's history or repairs. It really has been a journey fixing it up. I really want to make it a memorial for my favorite uncle. But It seems that every time I take the bike out for a ride, it won't restart. I have to let it cool for a really long time. I have a clymer repair book, but it doesn't mention anything about it. I do have a missing vac hose just infront of the seat above the rear coil. It has a nipple sticking up, but I can't find any diagrams that help. I don't have a California model. Please help if you can. I have a nervouse wife that doesn't like the idea of me riding that old of a bike, with mechanical probs. Nor do I. Thanks in advance.
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post #2 of 12 (permalink) Old 07-17-2009, 12:36 PM
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Welcome to the Group

As for the hot start problem. I had the same issue on my 93, replaced the old wet cell battery with a maintenance free battery, 100% improvement.

Glenn Douglas
Londonderry, NH
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post #3 of 12 (permalink) Old 07-17-2009, 12:59 PM
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Garage
ditto, on the agm mf battery, check the verses about ngk plugs too. as for an old 86, that is what I have and wouldn't trade it for nothing. go over your bolts and check for tightness, I found my right side frame bolts a little loose and my shocks on the left a little loose and also a motor mount I had to replace a nut on. for an 86 it is an excellent riding machine that is pretty easy to work on.
how many miles on the bike? I had a hot start prob but not since the mf battery
welcome to the group!

1986 vn 750 aka "Huck Farley"
42,000 miles
Rick's stator and rr
Tuxedo stator cover mod
pickup coil mod
dampers replaced
agm m/f battery
Harley sportster exhaust, degoated
Hid conversion
splines lubed
custom "vn750.com" grill cover
NGK Iridium spark plugs


acct to mcct mod https://www.vn750.com/forum/showthread.php?t=17917

rekeying locks, https://www.vn750.com/forum/showthread.php?t=7309

stator replacement walkthrough, https://www.vn750.com/forum/showthread.php?t=11369

Last edited by wib714; 07-17-2009 at 01:02 PM. Reason: a
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post #4 of 12 (permalink) Old 07-17-2009, 05:33 PM
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Install a MF AGM battery and NGK Irudium Plugs DPR7EIX-9.


Battery
http://cgi.ebay.com/ebaymotors/Deka-...4506.m20.l1116


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote
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post #5 of 12 (permalink) Old 07-17-2009, 07:32 PM
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Welcome to the group. As you can see, there are lots of helpful people here. I second (or third or fourth) everyting that's been suggested so far. Mine's an '89. Runs like a top!

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #6 of 12 (permalink) Old 07-17-2009, 08:04 PM
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Welcome to the Vulcan madness from sunny southern Alberta. The hot no restart is a common problem with most of our bikes. X2 to lance and all the others who suggest a MF-AGM battery and NGK Iridium plugs. Check the TEN THINGS at the bottom of my sig for some other issues you may not have encountered yet. I hope you can soon call your ride "Old Reliable". LOL

Gordon

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

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


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 #7 of 12 (permalink) Old 07-17-2009, 10:50 PM Thread Starter
 
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Thanks guys. I don't the good plugs or m free battery yet. Their a bit costly right now. I did change the gap on the pick-up coils to around .020 . I heard that usually works and wouldn't cost anything to try it. But it started fine, but when shut, same old thing. Anybody know how to check the ignition coils? I don't know the normal temp, they should run. And what resistance values should read when hot, verses cold. I should also mention that I know my stator is fried. That's one reason for the cheap battery. I don't want mess-up a good battery. Only a cheap 35 dollar walmart battery.
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post #8 of 12 (permalink) Old 07-17-2009, 10:52 PM Thread Starter
 
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Oh yeah, 18,000 miles on bike. But thats just on the speedo. It's probably a replacement.
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post #9 of 12 (permalink) Old 07-17-2009, 11:38 PM
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The coils are not the problem, You need an MF AGM battery and iridium plugs. Without a working stator and R/R nothing you do will help and a cheap battery just compounds the problem.

What tests have you done on the R/R and Stator?


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote
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post #10 of 12 (permalink) Old 07-18-2009, 09:49 AM Thread Starter
 
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Well, first off I tried checking voltage at the battery. It was the same voltage at all RPMs. Second, I bought another R/R on ebay after it failed the continuity tests in the Clymer's book. But when I received it, it tested bad too. So I figured maybe i'm doing something wrong. Third, I tested the stator. All three yellow wires have continuity with the engine housing. When I rev up the bike at night, the headlight does get noticeably brighter. Ive been told that was coming from the pick-up coils and not really charging. And I have left the bike hooked to the battery charger and let it warm up. And the bike would still not hot start. I have also checked the gas vent on the tank. I'm going to cap off that vac nipple and see if that helps. All vac diagrams in Clymer never shows where it goes.
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