Honda Vision carburettor flooding problem..

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Honda Vision carburettor flooding problem..

Postby ray 316 » Mon Apr 18, 2011 1:39 am

Hi folks l'm a newbie and needed help if possible, l've been seaching the web and came across this site for help and advice. Anyway l will tell you the problem on my wifes moped...........
My wife has a 20 year old Honda vision and it was running badly due to ruse deposits in the tank getting into the carburettor, l would clean the carburettor out and when started up again it would just get rust deposits in the carburettor. So l took the tank off today and clean it out the best l could with petrol, l then put a small in line fuel filter to prevent any rust deposits left in the tank entering the carburettor..
l took it out and it had not pulling back/hesitation at all, but when l came back and had it ticking over in the garden petrol was coming out the overflow pipe in the carburettor.
It had never done this before l put the in line fuel in and l wonder if this could have something to do with it so l took the fuel filter back off and just connected the rubbber fuel hose back up to the vaccum fuel tap and carburettor and started it up again, but it still had fuel coming out the overflow pipe in the carburettor so l presume the fuel filter l fitted is not the cause so l have put this back on...
The honda vision has a vaccum fuel tap bolted up to the under side of the fuel tank and this is working correctly as when l suck on the vaccum pipe it opens the fuel line for the carburettor and then shuts off when l stop.
So it's not that and it's not the fuel filter thats causing it to overflow and flood the carburettor so what could it be.
l cleaned the inside of the carburettor out and its had a new needle valve fitted already. but like l've already said before today it was shutting the fuel of in the carburettor but now it seems like the valve is opening and letting fuel flood the carb when the mopeds running ..
Any ideas and help would be great as this is doing my head in now, l've been on it all day and l'm no better off.
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re: Honda Vision carburettor flooding problem..

Postby John » Mon Apr 18, 2011 6:47 am

Maybe your floats are sinking or they are out of adjustment to shut off the needle valve. Clean the carb again, coat the tank with a sealer like Por 14 or similar. Look for some rust in the needle valve area. Install a shut off also in line.
I am moving this to the scooter section.
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Re: re: Honda Vision carburettor flooding problem..

Postby ray 316 » Mon Apr 18, 2011 11:47 am

John wrote:Maybe your floats are sinking or they are out of adjustment to shut off the needle valve. Clean the carb again, coat the tank with a sealer like Por 14 or similar. Look for some rust in the needle valve area. Install a shut off also in line.
I am moving this to the scooter section.
Hi john thanks for replying...
You say maybe the floats out of adjustment or sinking..
l have a plastic float john and it cannot be adjusted and l have checked to see if the float sinks in a cup of petrol and thats ok...

You say .. install a shut of in line, what do you mean by this john.
it has a in line fuel filter fitted and the petrol is controlled by a vacumm fuel trap (petcock) so when the engines not on the fuel does not entry the carburettor anyway.....................
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re: Honda Vision carburettor flooding problem..

Postby John » Mon Apr 18, 2011 1:51 pm

These vacuum petcocks are notorious for leaking down when the diaphragm gives up. Most of the time they are impossible to find to replace the cock. So to stop the leak down and filling the bottom end of the motor and hydro locking it you need a manual shut off valve (lawn mower style) cut into the line. Pain in the a$$ but at least it isn't flooded. When you have the carb off the floats should shut down any flow. Check by blowing through the inlet while you have the carb upside down to see if the flow of air stops.

There should be a manual around for Honda showing how to adjust the tab they swing from on the carb body. Maybe in our repair section you can find it in the Honda manuals or someone with a Honda could chime in. Also make sure the needle seat is clean of any gunk that could cause problems with the new needle.
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re: Honda Vision carburettor flooding problem..

Postby ray 316 » Mon Apr 18, 2011 2:17 pm

Hi again john, this manual shut off valve you mention are you saying put one on the vacuum line and shut off when the mopeds stationary as obviously this vacuum line need to be open when the engines started, but it's not flooding when its standing only when l start it...
Regarding the float how to adjust the tab, this float is all plastic and cannot be adjusted like the metal tabs on floats unless you have any ideas how l could do some adjustments to it.............
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re: Honda Vision carburettor flooding problem..

Postby John » Mon Apr 18, 2011 4:48 pm

Fuel line, Has to have a brass tab!!!
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Re: re: Honda Vision carburettor flooding problem..

Postby ray 316 » Tue Apr 19, 2011 1:37 am

John wrote:Fuel line, Has to have a brass tab!!!
Where would this brass tab be.. you say fuel line or inside carburettor..
Either way l have no signs of a brass tab on this moped... l will take some photos..
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re: Honda Vision carburettor flooding problem..

Postby John » Tue Apr 19, 2011 5:51 am

On the float there should be a brass tab fastened to the float to hold the pin that it rotates on. This may be where you need adjustment. They get bent when people take apart carbs to do a cleaning and let the floats hang.
As for a shut off valve, install it in the fuel line going to the carb instead of relying on the vacuum one for when it fails, which it will.
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re: Honda Vision carburettor flooding problem..

Postby maddog » Thu Apr 21, 2011 6:35 pm

take the float off and shake it cuz it may have fuel in it, get a carb rebuild kit along with a new diaphram as after 20yrs parts wear out.
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