Fuel issues and front cylinder... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 08-27-2013, 03:48 PM Thread Starter
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Fuel issues and front cylinder...

Hi everyone.

Quick background... Just starting riding about 2 months ago and bought a 85 Kawasaki Vulcan 700. I absolutely love riding and it's killing me that my bike has been out of commission for 2 weeks now. I'm new to this site also!

Rode bike for about 6 weeks, with little problems, but nothing major(cooling system issues, but was able to fix easily). I'm just going to list the issues and see if you guys have any thoughts.

-gas drips out of petcock through the clear vacuum line... is that suppose to happen? my petcock has OFF ON RES and 3 ports
-bike barely starts and when I do get it running the front cylinder knocks and expels a gas/oil mixture out of the exhaust on the front of the cylinder. It won't idle and needs to be revved above 3,000 just to keep the bike running.
- gas also leaks from the rubber fitting connecting the carb to front cylinder.

Beyond the cylinder having issues (bad rings, valves, rode etc...), I feel as though the carb is filling with too much fuel and it caused a "gas wash" of the cylinder. I know everyone is going to say pull carbs, check needle and float etc, and clean, but besides that, could the flooding of fuel cause cylinder to knock. Oil has been changed along with filter.

Sorry this post is all over the place... I just want to ride! Thank you in advance
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post #2 of 8 (permalink) Old 08-27-2013, 04:57 PM
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Sounds like the float in the front carb is sticking....try backblowing it (theres a sticky in the carb section)....if that doesnt work, you could have a bad petcock....the '85 should have a ON-RES-Prime setting...if its on Prime, can cause therse issues too....are you sure it says "off" ?...if it does, its been replaced....
Sometimes just tapping on the side of the carb with the butt of a ratchett will free a float...if it doesnt, then likely the float needle/seat is out of adjustment or shot....



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post #3 of 8 (permalink) Old 08-27-2013, 06:21 PM
..have a vulcan good day!
 
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Quote:
Originally Posted by Wolfie View Post
Sounds like the float in the front carb is sticking....try backblowing it (theres a sticky in the carb section)....if that doesnt work, you could have a bad petcock....the '85 should have a ON-RES-Prime setting...if its on Prime, can cause therse issues too....are you sure it says "off" ?...if it does, its been replaced....
Sometimes just tapping on the side of the carb with the butt of a ratchett will free a float...if it doesnt, then likely the float needle/seat is out of adjustment or shot....
I have a clear vacuum line on my petcock.
Bike was running sh*tty...viewed fuel getting sucked into the vacuum port.
Rebuilt Petcock ...problem solved.
Clear 3/16" line purchased off the roll....from hardware store.

hope this helps

'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 #4 of 8 (permalink) Old 08-31-2013, 06:07 AM
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Better to get it done by a professional though!
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post #5 of 8 (permalink) Old 08-31-2013, 03:31 PM
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...and pay megabucks ?....why ???????....all the proceedures are detailed in these pages, many with pics and vids....going to a dealer is the lazy/stupid out.....a man needs to learn his bike....there's no better way than hands on...and its not brain surgery. Most dealers wont even touch an 85 700, lol...



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post #6 of 8 (permalink) Old 08-31-2013, 03:38 PM
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If by "professional" you mean a person who is paid money for working on your bike, well, that's your choice. If by "professional" you mean someone who will do the work to the highest standards, well good luck finding one in a bike shop, they seem to be a dying breed.
I'm with Wolfie.

One can never have too many alternative forms of transport.
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post #7 of 8 (permalink) Old 08-31-2013, 06:41 PM
..have a vulcan good day!
 
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Quote:
Originally Posted by gibbo View Post
If by "professional" you mean a person who is paid money for working on your bike, well, that's your choice. If by "professional" you mean someone who will do the work to the highest standards, well good luck finding one in a bike shop, they seem to be a dying breed.
I'm with Wolfie.
X3 ! LoL.

'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 #8 of 8 (permalink) Old 08-31-2013, 08:38 PM
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By the way JT....we have quite a few members down your way that could even help hands on....add yerself to the member map, and let us know just where ya are....also, will be helpfull for future rides and get togethers....if, that is, you desire to ride with others....check out the Northeast section here...we're pretty strong and are tight....all brothers, and help one another...



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carbs flooding , cylinder knocking , fuel , petcock

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