Carb vent filter

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Carb vent filter

Mikuni's range of carburetors are a common sight on nearly every Japanese motorcycle ever built, ranging in form from a simple round-slide carburetor to the more-complex constant velocity carburetor.

While a Mikuni carburetor is reliable and generally requires little attention beyond regular cleaning, problems can and will occur. A fuel leak, starting from the carburetor's vent tube, can be worrisome affair for many motorcyclists. In order to fix the problem, you need to understand what causes the leak in the first place.

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Mikuni's motorcycle-specific carburetors use a float-type fuel delivery system. The float is a hinged valve that literally floats on the fuel surface within the carburetor's lower float chamber.

As fuel is drawn into the carburetor jets, the fuel level decreases and lowers the float. This in turn opens the valve and admits more fuel into the float chamber, raising the float again and closing the valve. This process occurs over and over, keeping the fuel at a predetermined level at all times.

A carburetor float is usually a plastic or brass component that is made up of two floating ends joined by central bridge that pivots within a pair of towers cast into the bottom of the carburetor. Most Mikuni floats have a tang at the center of the bridge that is used to push the fuel valve upward into the valve seat, restricting the incoming flow of fuel. In some cases, the tang is adjustable to raise or lower the fuel level for performance tuning purposes.

If the tang is moved upward, the fuel level is decreased and vice-versa. It should be noted that plastic floats usually do not have this type of adjustment available to them. The carburetor's internal fuel level is directly correlated to the float height, as determined by the float's tang. If the tang is lowered too far -- bent down to an almost flush position with the central float bridge -- the float's height, and the fuel level, will increase beyond a safe limit and overfill the float chamber.

The excess fuel will begin to leak out of the vent tubes built into the carburetor body in an attempt to return the fuel level to its normal limit. However, since the float height was set too high, it will continue to admit fuel into the carburetor. Additionally, the excess fuel may find its way into the engine through the carburetor jets, where it could leak past the piston and into the engine oil. The combination of fuel and oil results in a thinned mixture that reduces the oil's ability to lubricate the engine, causing premature engine wear and failure, if left unchecked.

The exact method to reset your carburetor's float height and fuel level will differ between motorcycle manufacturers and individual model types. This being said, most manufacturers specify a maximum fuel level between 10 to 25 mm below the float chamber's mating surface.


This is checked by placing a clear plastic tube onto the drain nozzle at the bottom of the float chamber, which is then bent up and around the side of the carburetor in a U-shape. The float chamber drain screw is then loosened to fill the tube with fuel. The amount of fuel held in the tube is representative of the internal fuel level. Next, the carburetor is removed and drained, then the float chamber is removed to access the float.

The float tang must be bent either upward to lower the fuel level, or downward to raise the fuel level. Once the float has been adjusted, the carburetor is reinstalled and the fuel level check must be performed again. A vent hose fuel leak can also occur if the float valve does not seat properly in a fully closed position, allowing fuel to continue to fill the float chamber regardless of the float position.

This is often caused by debris trapped between the float valve and valve seat or deformation of the float valve tip. The float valve should be inspected and cleaned, if the fuel leak continues after setting the fuel level via float height adjustments.

The valve tip should appear uniformly pointed without any side-to-side deviations or blunting. If the valve is distorted or worn, both the valve and its seat should be replaced immediately.Log in or Join.

Adventure Rider. Dismiss Notice. Become a site supporter for a free shirt and ad free viewing. BillroyFeb 14, At the time, after researching most threads on the canisterectomy it seemed that most people were reporting success with fitting some form of filter on the carb vents just below the airbox to prevent possible dirt from finding it's way up the vent hose and into the carbs.

I added a small fuel filter metal exterior with paper filter interior just after the Y in the carb vents right below the airbox. Next I added staintune exhaust and raised the stock needle one clip and went for good long test ride.

Next I added a 45 pilot and put the stock needle back to clip 2 and went for a test ride. Outstanding performance. The bike was flying like a homesick angel and then after 15 mins into my ride upon landing the front wheel after a great power wheelie the engine just suddenly died.

I cranked and cranked and finally the engine sputtered to life and began backfiring and spitting something fierce before finally dieing again. I trailered the bike home and didn't have a chance to look at it as I was late for another engagement now.

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The next day I went into my shop and the bike fired right up so I figured it must have been the much-talked-about tank vent issue so I removed the one-way tank vents top that I had installed in case they may have clogged, removed both tanks and checked to make sure I wasn't kinking the lower tank vents or fuel supply hose and reinstalled.

I went for another ride and this time, only 5 minutes into the ride with unbelievable performance, again after landing from a wheelie the engine just died instantly. I opened the tank caps, checked the fuel petcocks and cranked and cranked til the battery died.

I pushed the bike home as I had stayed close this time. I spent a sleepless night trying to figure out what it could be that would cause a bike to die after a wheelie.

carb vent filter

Surely it couldn't be some demon KTM installed in the bike to keep people from stunting or killing themselves I went through all the things I had done to the bike. Exhaust change: that wouldn't cause great performance followed by death after 15 mins. Jetting: usually jetting will let you know right away if your changes are correct -not after 15 minutes and not by a sudden stall.

Canisterectomy: I had done this several rides before, why would it come back to haunt me now? Then it hit me. The bike was dieing exactly the same way my previous dirt bike honda crfR did when I tried to ride through a creek more than 10" deep.

Only one tank vent hose hanging down below the bike and as soon as it touched water the engine died. The next morning I took the right tank off, reached under the airbox and cut off the filter that I had installed on the tank vent hose. I blew on the filter and it was hard to blow until a big slosh of fuel spurted out.

In the garbage it went.

Carburetor & EFI Accessories

Now the carbs are vented to atmosphere just below the airbox.Gas leaks around the air filter usually indicate problems with valves inside your engine and how it is processing gas. Read below to learn what specifically could be causing your lawn mower and small engines to leak gas through the vent tube and air filter. Always handle fuel with extreme care.

Never attempt to start or operate an engine or machine that has a fuel leak. Always read the engine and equipment manual s before starting,operating, or servicing your engine or equipment to avoid personal injury or property damage.

Find all Engine Safety Warnings. Gas leaks around the lawn mower air filter can indicate your engine valves are not working properly. If your engine has a fuel shut-off valve, ensure that this valve is closed when the engine is not in use. Check for any signs of valve damage that could prevent it from automatically closing when the engine stops running.

If it stays open and sticks, it could indicate that the valve is worn-out and in need of a replacement. Another common cause of gas leaking around air filters is due to carburetor issues. Cleaning or replacing your carburetor or fuel float may be necessary, but make sure to understand how to troubleshoot or service carburetors before taking action.

Learn how to properly and safely use, troubleshoot, and maintain your lawn mower, tractor, snow blower, and other lawn and garden equipment. View How-To Articles. Browse Videos. All rights reserved. Innovations Products YOU. Change Region. Engine Innovations. Portable Generator. Pressure Washer. Why engines matter. Pressure Washers. Care Products. Snow Blowers. Water Pumps. Related Links. Dealer Locator. Warranty Information. Maintenance How-To.

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Why is there a gas leak by the small engine air filter & vent tube?

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My Mikuni Carburetor Leaks Gas From the Vent

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carb vent filter

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carb vent filter

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Beware of adding filter to carb vents (after canisterectomy)

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