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post #1 of 12 (permalink) Old 08-23-2009, 03:43 PM Thread Starter
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Smile Great bike,but...

Well Vulcan people,I bought a 1986 VN 750 .I love this bike when it runsgood.Over the last two years I have pretty well rebuilt this bike.The problem I have every now and then is sometimes the bike will start to break down,as if it was only running on one cylinder.All firing and pickup coils have been replace.If anyone could help me out with this problem,it would be greatly apprecated.:
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post #2 of 12 (permalink) Old 08-23-2009, 04:02 PM
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Check the cylinder for compression. If it is good, most likely the problem will be in the fuel delivery. Carb problem. my guess
I am assuming that the spark plugs have been replaced.

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post #3 of 12 (permalink) Old 08-23-2009, 06:56 PM
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A lot of people have had problems like that and sometimes its with the ignition switch. Could also be a week battery, or loose connections. Electrical or fuel could be the problem, it will not be easy to find, but I hope it does not take you long. May have to check all the wiring in the ignition system see if you have something grounding out. Wires from the coils and or the pickup wires from the Stator.

2004 25,500 miles
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post #4 of 12 (permalink) Old 08-23-2009, 07:15 PM
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what octane fuel u runnin....double check all the ground connections... have u tried seafoam yet??? when mine kicked to one cylinder it was in the base of the ignition switch there was a loose connection... i wanna say its in the fuel cause it sounds like u have been through the electrical system (12 volts at the coils ect...) the fuel system if it works it works and if a jet gets plugged then thats it and it wont fire till its cleaned (usually) .... on the other hand i have found any small variable in either system could cause whats happenin to happen lets start at the top and we'll walk u through this ...

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post #5 of 12 (permalink) Old 08-24-2009, 08:47 PM Thread Starter
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Thanks for the help.This is good info.I will let you know.
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post #6 of 12 (permalink) Old 08-24-2009, 08:53 PM
'86 VN750
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I have an '86 also. It seemed to be doing the same thing then all of a sudden it wouldn't start at all and was leaking gas from the vacuum line behind the right air cleaner and out the exhaust. Found that one of the floats was 3/4 full of gas. Replaced it and now it runs like a top. Pain in the butt - but for a $30 part - worth it. Good luck.

'86 VN750
K&N Air filters
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post #7 of 12 (permalink) Old 08-24-2009, 10:44 PM
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Check your spark plug wires. I unscrewed the cap on mine last weekend and 2 of the 4 were corroded. An easy and often overlooked part on most engines.

Look at all the easy stuff first.

1986 VN750A(2) 12224 miles.
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post #8 of 12 (permalink) Old 08-25-2009, 09:24 AM
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Pull your plugs and see if they're wet and black. Check your spark. If you have good spark and your plugs are wet, then it is probably flooding. If you have good spark and your plugs look normal, then you might be starving for fuel. I agree that you want to spend your time right now on the simple stuff, and there are lots of things to check out, loose or corroded connections, grounds, etc... Good luck!

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2002 VN1500 Classic
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post #9 of 12 (permalink) Old 08-27-2009, 08:34 PM
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could be as easy as a dry rotted vacuum or fuel line. cheap and easy to replace and probably need it anyways being an 86. I'm getting ready to do mine!

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

acct to mcct mod

rekeying locks,

stator replacement walkthrough,
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post #10 of 12 (permalink) Old 09-12-2009, 03:56 PM
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Originally Posted by sserbop6 View Post
★AFK comes back to play half a year later....
^ Reported ^

AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC

"When life throws you curves,
Aim for the apex."

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