Running on one cylinder? HELP! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 24 (permalink) Old 08-17-2011, 10:07 PM Thread Starter
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Running on one cylinder? HELP!

Hey guys, new to the forum, first thread. Hope y'all can help me out.

Definitely running on one cylinder. It's an 88 by the way I'll get a picture up soon. Bought it for $900, needed a carb. clean and tires. Has only 14k miles on her. Just wish she'd run consistently.

Some days she'll start and run fine. Definitely needs a new battery, doesn't crank over fast enough, already tried charging it up over night. Lost that after a day or so.

Main problem: putters around my driveway on one cylinder, then when I crank her down the road, backfires a couple times on the left side I believe (rear cylinder??) and then you can feel it kick in big time.

I took it out tonight and it didn't kick in for about a mile or 2, unlike past couple times when I cruised out of my driveway. Cleaned the carb good, was a hell of a time getting it out. Wondering about carb. syncing and fine tuning like the mixture and stuff. Not too familiar with bikes, but I do all my own work on my truck and I got tools and everything, just kinda wondering what the first and easiest things I could check.

Also, seems like theres a bit of gas leaking out of the petcock. Very tiny leak, like barely dripping after I come home after a couple mile ride. Probably should take that off and I hear theres a screen in it? Blow out the hoses to the carbs to, sound good?

Just give me a list of everything to do/check while I take this b*tch apart. Perhaps tomorrow or hopefully sometime soon this week. If I can't do it myself there's a good cycle mechanic down the street, I'm just a bit low on cash, in college and all, so looking to fix her myself.

THANKS GUYS.
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post #2 of 24 (permalink) Old 08-17-2011, 11:43 PM
..have a vulcan good day!
 
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Welcome to the forum. A lotta good stuff can be found here.... u came to the right place for answers. These guys r the greatest. The fuel leak from the the Petcock....probably need to replace all the O rings... believe there r 3 total. I have the same problem on my '86.
As with the other problems... let the experts give advice.

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #3 of 24 (permalink) Old 08-18-2011, 12:17 AM
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Welcome to the Vulcan madness cjwvalentine.
I`ll let the carb gurus wade in on this one.

But when you get a new battery make it Maintenance Free-AGM like this one:
http://cgi.ebay.com/ebaymotors/Deka-...item3eee173adb
Don`t waste your money on a cheaper conventional wetcell.

There are petcock rebuild kits on ebay selling for about $30-40.

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 #4 of 24 (permalink) Old 08-18-2011, 12:44 PM
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Quote:
Definitely needs a new battery, doesn't crank over fast enough, already tried charging it up over night. Lost that after a day or so.
Yes, get a new battery. After that, check the charging voltage.
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post #5 of 24 (permalink) Old 08-19-2011, 09:22 AM Thread Starter
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Took the battery out and decided I might not need one. The thing is brand new. Wondering about the coils. My dad and friend keep telling me to check them, but how do I? I was told the switch the wires but they won't be able to reach. I still think the carbs need to be tuned, but the rear cylinder spark plugs are a bit black. Cleaned the one but I have to find an 18mm somewhere. Pisses me off when you have a garage full of tools but can't find the right one, nor know if it's even there.
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post #6 of 24 (permalink) Old 08-19-2011, 10:31 AM
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Quote:
Definitely needs a new battery, doesn't crank over fast enough, already tried charging it up over night. Lost that after a day or so.
I understood this so that the battery lost the charge in a day. Yet you say that it is good??

Quote:
Wondering about the coils. My dad and friend keep telling me to check them, but how do I?
Remove the spark plugs and observe the spark while cranking. At least you see if there is difference between the front and the rear cylinder. You could also measure the primary and secondary resistances of the coils.

Quote:
Pisses me off when you have a garage full of tools but can't find the right one, nor know if it's even there.
My problem is that I know it is there somewhere but I can't find it. Even when it was in my hands a few minutes ago!
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post #7 of 24 (permalink) Old 08-19-2011, 01:08 PM
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My bike was cranking really slow and it turned out to be some kind of short on the wiring.

My petcock is also leaking. I'm getting a rebuild kit from ebay for $26 that's the cheapest I found and everyone seems to agree that it's a good kit.

Here's the link:

http://cgi.ebay.com/ebaymotors/_W0QQ...KQ3aMEWAXQ3aIT
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post #8 of 24 (permalink) Old 08-19-2011, 01:10 PM
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One way to determine if you need a new battery is to hook up your car battery to your bike and give it a try. If it fires right up, you probably do need a new battery. Just don't turn on your car when you jump it.
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post #9 of 24 (permalink) Old 08-19-2011, 01:36 PM
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spark plug socket

A normal 18 mm socket doesn't fit the deep plug. Go to sears and purchase a
#50728 18 mm deep spark plug socket $5.99 it fits perfect. It saved me a lot of looking through my tools. Hope it helps
Hegman
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post #10 of 24 (permalink) Old 08-19-2011, 02:21 PM
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Quote:
Wondering about the coils. My dad and friend keep telling me to check them, but how do I?
Primary resistance specs: 1.8-2.2 ohms
Secondary resistance (between both spark plug wires and the coil) 19K-29K ohms.

If you cant find an 18 mm spark plug socket, look for a deep thinwall 18 mm socket.

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/showthread.php?t=9127

Last edited by OlHossCanada; 08-19-2011 at 02:24 PM.
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