Whats float level set to

What is carbon vent? Never heard of it.

If you mean the carburetor vent at the carb's fuel bowl, the fuel level is probably too high in the carb. The top of carb will need taken off to set fuel level, unless there is an external screw for setting float level.

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your float settings inside your carb are set wrong read my advice to resetting them and you should be ok
You'll need to first start off by removing your carb. Be sure to clean the surrounding area to the best of your ability to avoid dirt and debris falling into your carb; or worse, your engine. After you've removed your carb I would suggest a thorough cleaning using carb cleaner (or equivalent) and compressed air to ensure that all jets and passageways are spotless. Avoid using wire or other tools to clean orifices of jets; it's all too easy to alter their original designed dimensions.

After your carb is clean you can now set your float level. The picture below will allow you to become familiar with the parts that are responsible for maintaining the correct float level in your carb. There are four basic parts, the floats themselves (part of the float assembly), the float assembly tang, the fuel inlet needle valve, and the fuel inlet valve seat.


(Float assembly pivot pin not shown.)


It is always a good idea to remove the float assembly pivot pin (already shown removed) and extract the float assembly and the fuel inlet needle. The fuel inlet needle is a wearable part and over time can deteriorate. A worn fuel inlet needle can contribute to an irregular float level. Most fuel inlet needles consist of an internal spring loaded bumper (which contacts the float assembly tang) and a plastic or Viton (rubber) tip. Inspect the fuel inlet needle tip for wear and/or damage. To give you an idea, Eric Gorr recommends replacing the fuel inlet needle/seat assembly every two years. I've found that the average cost is around $15 for both parts.


(Fuel inlet needle shown with Viton (rubber) tip. The Viton is used to isolate the fuel inlet needle from vibration and to create a better seal against the fuel inlet valve seat.)

Now that you've made sure you aren't going to have any issues from worn parts you can reinstall your needle, float assembly and float assembly pivot pin and continue on to set your float level. The float level measurement is taken from the top of the floats (when the carb is positioned upside down) to the gasket surface of the float bowl as illustrated in the next picture. You can use an open-end wrench (sized per your spec), a small metric ruler, or a float level gauge. The tolerance for your float level is usually around +/- 0.50mm.




When setting the float level be aware that the spring loaded bumper on the fuel inlet needle valve may have a tendency to compress under the weight of the float assembly which will skew your measurement. Before you obtain your measurement you'll need to make sure that the float assembly tang just barely makes contact with the spring-loaded bumper. Sometimes it is easier to hold the carb body at a 45-degree angle to avoid compressing the spring in the fuel inlet needle.




If you find that your measurement does not match your float level spec then you can carefully bend the float assembly tang to achieve your desired measurement. Be sure to recheck your work, and if you feel confident that your float level is spot on then you can reinstall your carb and get back to riding.

Either the float level is too high or there is debris in the float needle seat. This causes the carb to overflow while running. The fix is:
- Remove the main fuel line with the fuel selector off of you have one.... or pull the line and plug it off / keep the end above the fuel tank then
- Remove the float bowl from the carb.
- Pull the float pin and remove the float and float needle (INSPECT float needle rubber tip for damage or dirt... any damage replace float needle and seat.)
- Spray carb cleaner into the main fuel supply hose / manfold fitting on the carb. Your removing any debris that night be in the float needle seat area
- Spray carb cleaner in all open fuel jet passages without dis-assembly of the carb.
- Reinstall the float needle and float (Float pin too!)
BRIEFLY reconnect the main fuel line
GENTLY lift the float to level.... (Incoming fuel flow MUST stop) Lower float.. (fuel must flow)
If the fuel flow does not stop with the float level.. you must replace the float needle snd seat. After needle and seat replacement if fuel still does not stop with the float level the tab where the float needle is will have to be bent UP no more than 0.010 at a time and then re-test flor fuel stoppage with float level. Adjust tab as necessary to get the float level correct.
- re-assemble carb
- test... running and static.
Thanks for choosing FixYa,
Kelly

the float level is set with the carb on the bench float should be level with carb body above needle and seat you may nave abad float remove and shake to see if it has gas in it i would also recomend changing the needle and seat due to the age of bike

Float tabs come set flat to surrounding plate, bend up to decrease level and down to raise level. Raised level too much and you risk fuel overflow on sustained inclines and too low a level and you will lean out at high revs and damage valves/piston real quick. There is no set level to speak of, but better to err on the side of losing a bit of overflow. The overflow drains from the carby via a plastic hose from just above float bowl flange.
Cheers.

With the float installed turn the carb upside down so the float is pointing up adjust the tab until you see the underside of the float is parrellel to the carberator's metal flat body section. This setting will provide the proper fuel level in the carb providing the proper maintained level of fuel for performance around tight turns as well as idling.

YOU CAN ADJUST FLOATS WITHOUT SPECIAL TOOLS. ALL YOU NEED IS A FOOT LONG PIECE OF CLEAR TUBING, SIZED TO FIT THE BOWL DRAIN. SET FLOATS AS CLOSE TO WHAT THEY WERE WHEN YOU REPLACED IT. INSTALL THE BOWL AND PUT THE TUBE ON THE DRAIN. OPEN THE BOWL DRAIN SCREW WHILE HOLDING THE TUBE UP BESIDE THE CARB. WHEN YOU GET THE TUBE BESIDE THE CARB ASSY., THE GAS IN THE TUBE SHOWS YOU THE EXACT LEVEL OF FUEL IN THE BOWL. FROM THIS YOU CAN MAKE ANY ADJUSTMENTS NECESSARY FOR CORRECT LEVEL. THE LEVEL SHOULD BE RIGHT BELOW THE PLANE WHERE THE BOWL MEETS THE CARB BASE.

I have a 1982 Virago 750 that I just did a carb rebuild to. To set the float levels I built a jig from wood that simulates the position of the carbs when mounted on the bike. This jig clamps into my bench vise. I created a fuel supply using a small funnel and a piece of fuel hose mounted above the level of the carbs.. After that all you need is a short length of transparent fuel hose to attach to the drain on the bottom of the float bowl to provide the visual indication of the float setting. Now you are ready to set up the float levels on your bench. This is way easier than trying to set them up in the bike.

Make sure that the jig is set up so that the carbs sit as level as possible across the pair and that they sit as close to the natural position in the bike in the lengthwise position when the bike is sitting level.

The process of setting up these floats can be very tedious, be patient. It may require that the float bowls be removed multiple times to get it correct (I replaced the philips head machine screws with allen head screws to make this easier). Printed instructions for the procedure look for a certain fuel level setting plus or minus 1mm. This kind of tolerance can be quite difficult to get when the only adjustment you have to work with is to bend the metal tang on the float assembly.

Did the carb kit come with a new float? It sounds like the float level is not set right, it has a hole in it or the needle is not seating right. If the float is not set correctly it will hit on the carb body before it shuts off the fuel flow with the needle and seat. If the float has a hole in it it will fill with fuel and not float at the proper angle to shut the fuel off when the desired level is reached. Remove the top of the carb and inspect the float when closed it should be just about level with the top plate from the carb. Shake the float and see if you hear any liquid in the float. Also are you running a mechanical or electric pump? Mike
P.S. I myself have forgotten to install the needle in a carb rebuild.

Let me know how you make out.