major flooding when parked!! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
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post #1 of 51 (permalink) Old 04-14-2016, 06:54 PM Thread Starter
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major flooding when parked!!

still new here... ive read many posts about flooding but havent found much that helps or maybe im not understanding things fully

my gas tank will drain into the crankcase over night. oil change yesterday and got at least a gallon of gas in the oil. so this isnt all the time but most of the time the bike sitting and after maybe an hour i notice a heavy drip from the drain screw area(left bottom carb area). so ive pulled the carbs cleaned. everything seats good and is sealed ive put vacum to everything, the float needles close. wierd thing is ill go to drain the bowls and the one thats flooding never seems to empty(sticking float?) and the vacum line from the petcock to carb will have a pretty good flow of gas if i pull the line off the carb. everything has been cleaned and reassembled.

am i not fully understanding how the carbs work? or is it that this float isnt applying enough pressure to cut off fuel?
help please ive spent 100 in oil changes this week. and loosing gas isnt to fun either, not to mention the smell lol
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post #2 of 51 (permalink) Old 04-14-2016, 07:24 PM
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Quote:
vacum line from the petcock to carb will have a pretty good flow of gas if i pull the line off the carb.
1) Your petcock is leaking through it's diapragm. Have to rebuild or replace with a manual petcock TW-200... PW-200 ? There are posts here on it.

2) Float could be cracked, holding gas, which causes it to sink instead of float. Float could be sticking, but will still close if lifted by hand. The float should be able to hold back the gas, if it's working.

2b) Dirt in the float valve. (maybe)

3) Sometimes ... Certain carbs with clogged air bleeds will create an internal spihon which drains the carb out through the throat of the carb. Simply covering the air bleed with a finger can make certain carbs overflow immediatly. Dirty air bleeds would have to be cleaned and blown out.

I have this same problem on my bike right now. Oil is over full and smells like gas. Shifter gets sticky when warmed up. Been holding off rides for an oil change and fixing the problem. Need to check my vac line. It should always be dry.

I left the petcock 'on' all winter.
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post #3 of 51 (permalink) Old 04-14-2016, 07:46 PM
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My vac line is wet on the carb end, not so wet at the petcock. Been sitting a couple weeks since last started, I fired it up a few seconds, still the same amount of gas in the vac line. Not a lot, but enough to get my finger wet.

Finally turned the petcock off.

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post #4 of 51 (permalink) Old 04-14-2016, 08:39 PM Thread Starter
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So after posting I went out and stared at the bike for 30min and yanked the carbs. Cleaning and disassemble and reassembling just to be sure.

Dunked floats in water there floating and not filling up. The needles seemed to stick slightly in that little pocket they slip in...only at just the right angle tho so I slightly sanded down the little tabs on it just so they were smooth and moved easy.

Carb vents are clean on the carbs I will clean the hoses.

Even if my petcock Is leaking the bike shouldn't flood right? The bowls would fill and fuel SHOULD cut off. Obviously it's not tho...

I did notice on the side of the carb the small diaphragm with the short spring. There's a small hole above it that has a tiny rubber gasket. It had made its way on top of that rubber diaphram. Would that have an cause??
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post #5 of 51 (permalink) Old 04-14-2016, 08:49 PM
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The float should stop the fuel flow.

Give the floats a shake to see if they're both empty.

Quote:
I did notice on the side of the carb the small diaphragm with the short spring. There's a small hole above it that has a tiny rubber gasket. It had made its way on top of that rubber diaphram. Would that have an cause??
I'm not sure where you are talking about. The circular plate with three screws? (coast enricher) You mean the gas is getting that far up in the carb?

Look around the carb body for any brass balls that are pressed into holes. There are also some in the throat (2 or 3), where the intake/filters hook up. Those are air bleeds. Clean them as much as possible, then use compressed air if you have it.
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post #6 of 51 (permalink) Old 04-14-2016, 08:53 PM
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The petcock leak will make the front cylinder run rich, even if the carbs are right. It will pull extra gas through the vac line.

The float problem has the level in the bowl getting too high, and the fuel dumps through the cylinder when parked.

I'm pretty sure these carbs don't have an open overflow line to prevent filling the crankcase. So then gas just runs out the throat into the cylinder, and into the crankcase.

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__________________________________________________ ____________
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Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf

Last edited by Spockster; 04-14-2016 at 08:58 PM.
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post #7 of 51 (permalink) Old 04-14-2016, 09:11 PM Thread Starter
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The area I'm talking about is on the bottom side opposite of the float bowls it's got 2 screws. It's much smaller then the enritcher. The small hole in mentioning goes through to the throttle plate on the side it connects to the cylinders
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post #8 of 51 (permalink) Old 04-14-2016, 09:13 PM Thread Starter
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Is there a way I can test the floats off the bike ? Fill it up and see if it pours out the fuel fill line?
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post #9 of 51 (permalink) Old 04-14-2016, 09:19 PM
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You can fill the carbs with a fuel line hooked up. Have to get the petcock flowing or find a way to get gas in the lines.

Always a chance the float height is too high. That is checked with the bowls in place and the carbs full. Here's a pic from the manual. Need a piece of clear hose attached to the drain port.

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post #10 of 51 (permalink) Old 04-14-2016, 09:50 PM Thread Starter
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I can't see the pic on my phone but I'll view it later on the laptop
Both cut out fuel when I blow into them with the center of the float at the first notch of the bowl
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