From the illustrations, it looks like it runs off the carb, up toward the airbox. It just needs to be routed down behind the engine with all the other vent hoses. In fact mine were pushing against the float bowl this caused excess vibration into the carb body, which in turn plays havoc with the float levels. Right side view; The right side view (#2) shows the primer tube, fuel hose, and behind that is a vent for the nozzle. The carb came from the factory with a rubber cap installed on that hose bib. or the end is in a bad place (where air is forced into it, etc. Thanks. Carb top view, 90° rubber elbow in lower right corner The hose wraping around the diaphragm filter leads to the bowl filter behind the brake fluid reservior. #1. It looks like there is a port on the fuel pump to the left of the fuel line fittings. Aprilia and Piaggio 50cc, and Others I checked all the fuel lines to the carb, they're not kinked and they don't try this get the vacuum hose that came from the fuel pump (is it a . Since only one of the carbs leaks from the vent hose could it be another problem. 5. I am lifting the float until it makes contact with the needle valve and then measuring it from the top of the float to the lip of the carb. Well it's more like spewing it out. Could that hose bib be intended for the vent hose … As a field expedient in the case of an occluded carb vent hose (assuming no Tee mod), simply yank the hose off the carburetor nipple--atmospheric pressure will then be restored to the surface of the fuel in the float bowl, permitting fuel flow through the jets. The only feature here is a pressed in plastic external atmospheric vent. 2) Mikuni Non-Polished HSR Smoothbore Carburetor. Looks like bottom is before venturi so I'm thinking that's supply line, also looks like old hose had a restricted type connector and the new hose did not. Tecumseh Carburetor Diagram. If the bike still has the airbox you should replace the paper filter that goes in it. The purpose of the vent tube is to allow air in to the fuel tank so that a vacuum is not created when the fuel is being fed through the fuel line. The tank hose is just a vent to allow air into the tank as the gas flows out. What is its purpose. If anything interferes with the hose (another part pinching it, etc.) The carb bowl vent was a little different. R. Both 2 and 3 run down the side of the bike under the faring. When troubleshooting the carb, remember its job is to mix fuel and air to a specific ratio for the engine's consumption. Mikuni carb hose purpose? • Locate the vacuum advance hose and connect it to the vacuum advance port on the carburetor. The carb has a second smaller rubber hose, about 6" long connected onto the carb with spring clip, beside the fuel hose, but the other end was not connected to anything, and is open to dirty air. I'm planning on hooking up the Supply and Return to the truck's return pipe but don't quite know what to do with the Vent hose (5/16"). model#316796150 Where does the supply line connect & where does vent hose connect and how far into tank does vent hose go? We have the Breather Tube you need, with fast shipping and great prices! ... To test it put a hose on the fuel inlet of the carb and blow into the hose and gently push on the float to move the Valve up and see if it closes the fuel inlet. STIHL 029, 039 11.7 Tank Vent 11.8 Fuel Pickup Body and Fuel Hose Top: 1 = Grub screw 2 = Vent hose Bottom: Correct positions of grub screws a = Removing tank vent approx. The brass check valve is in that hose about 4" in from the loose end and the brass mesh is in the loose end of that hose maybe an 1". Most of the time the Vent line is connected to a fuel line grommet that is installed on the fuel tank. THere is a fuel inlet yes, the big hose goes there...then I have two smaller diameter hoses that fit on two inlets on the upper part of the body...what are these for? I am building a custom bike with a 2000 sportster 883 engine. When the scooter is running the vent tube on the side of the carb is dripping gas out of it. I have my carbs apart and I am getting the same measurement on the float for both carbs(~.5"). The airbox is also an important part of … The purpose of this fitting is connect ion to a vacuum actuated petcock via a hose. Briggs and Stratton Breather Tube: Jack's is your Place! This is often caused by debris trapped between the float valve and valve seat or deformation of the float valve tip. Route them through the notch in the faring shown below where they cross the water line. Throttle linkage #3. Reply. This carb is compatible with all Harley Twin Cams from 1996 to 2006. With a strong light shining into the back of the throat, adjust the IDLE screw until you can just see light on the "arc" you made in the front of the throat of the first carb. Briggs and Stratton Breather Tube. The long vent hose is usually directed down to the road and away from hot exhaust pipes, cylinders, and away from your crotch (which to me is the most important part of my body). • Locate the original fuel bowl vent hose and attach it to the fitting on the Weber Carb. The hose on the out side of the tank is 8" long and attaches to the white carb box baffle crossing from the flywheel side to the clutch side of the saw above the carb. Get shopping advice from experts, friends and the community! Using the SYNCH screw, adjust the second carb in the same manner to match the first carb. yes the 7 hoses on carb. There's a vent tube coming off the left side of the carb. 4. This gives you clearance to put the faring on easier. Reactions: hanshyde. Things like a leaking or pinched hose, valve clearance, a dirty air cleaner, removing the airbox lid, even running out of fuel. The venturi effect creates a low pressure above the needle jet (essentially, a weak vacuum), which draws fuel up from the float bowl (which is kept at atmospheric pressure by means of a vent channel above the carb … To make installation into the fuel tank (through the grommet) simpler, use wire cutters to cut a taper at the end of the fuel tube. It looks like it is intended to vent hose #2. MC.com ruined this forum Silver '86 450 Black '00 250 Red '07 250. That hose bib is the exact same size as the hose bib on the fuel pump. I'll be placing fuel filters (10/2 micron) and a pump in the configuration. This carb is designed to fit a number of Harley Davidson motorcycles, from 1960 to 1999, some of which I … GOOFIT Orange Tubing Carburetor Fuel Tube Petrol Hose Vent Line for ATV Dirt Bike Go Kart Moped Pocket Bike Tube length: 105cm Inner diameter: 5mm Read more Accessories & Parts Universal Quad Vent Carb Pwk 34 36 38 40Mm Pwk38 As/S66 38Mm Air Striker for Keihin Carburetor for Trx250R Cr250 Lt250 – (Color: 36Mm) Fuel tank vent hose connects to the carb drain hose. There are many things that can cause an imbalance in your mixture besides the carb itself. It can be found on Amazon here. This hose is excellent for use in vent applications where an EPA or CARB requirement is not required. #2. (see Pictures 1B and 2B) Locate any open vacuum … For … It's purpose is for a siphon break. Cat equipped bikes also have fuel cutoff solenoids in the carb float bowls. My Holley 4160 4V Marine carb has a small hose bib protruding from the neck of the carb. Tecumseh Carb 640342; Shown is the left side of Tecumseh Carburetor 640342 (#1). The Fuel Tank Vent is connected to the Fuel Vent Tube. I bought a house and the recon came with the home. This is done so that a heavy shot of unburned fuel does not make its way into the Cats when the REV limiter cuts off ignition to 1 cylinder. In the diagram attached, 35 is the fuel cock and 23 is the fuel pump. The long hose routed down from the vent helps keep random stuff from falling into the vent (which is directly connected to the carb bowls that hold your fuel, after any filter you may have added). Where is this small hose supposed to connect or what should be done with it? The area of the carb throat controlled by the rising and falling slide is called a venturi. One is connected to the carb, one goes to the tank, one is for tank overflow, then what is the other one for? - posted in Vintage Ski Doo's: I have dual mikuni's...I'm mikuni dumb There is a total of three hoses. See picture # 5 for more details. I had it on the left, the right above, below and behind the carb. All Rubber Vent Hose Designed to meet SAE J1527 A2 requirements. There are 2 connections on carb; 1 on top 1 on bottom. I took pics of it before yanking the vent hoses off, but did not capture enough. It's about 7 inches long and has a 90-degree bend on the end. Turn screws adjusting both idle and main mixture in (clockwise) finger tight, however over tightening the screws may partially or entirely damage the tapered portion of the needle. Above that "T" is another "T", that loops upward and over the carb and back down. In looking at my shop manual, it's referenced on page 1-21 (arrow (5)), and 5-10 (bottom of page in photo). If on #2 body, it will sit behind the vent spigot and if located on #3 carb body, it will be located as shown on the picture at the top of the page. One other area of concern on the Beta is the two vent hoses coming out of the engine are far to near the float bowl. Lightly lubricate the tapered end of the fuel tube with 2-cycle engine oil (this will allow the tube to pass through the grommet more smoothly). People over the years have heard horror stories about carburetors or maybe even had a bad experience firsthand (who hasn’t been at the race track and witnessed a carburetor fire in their lifetime?) Save Share. I have an 03 Recon ES that i took the carb apart and cleaned. This fitting is a passageway directly into the carburetor venturi. The Holley has a capped port that just enters the primary bores at the spark arrestor flange, this got me thinking. The purpose of the solenoid is to cut off the fuel supply a few hundred RPM prior to hitting the REV limiter. There is no idle mixture screw or fixed idle jet. After that, slowly back out the screws in a counterclockwise direction to the pre-set position. The tank came with three hose connections: (1) Supply, (2) Return, and (3) Vent. Reset the IDLE screw to original position. Novaflex 360-03 is an ... purpose marine hose designed to meet the requirements of J1527 A2, ISO 7840, USCG, Off the carb, there is a T-connection where there are three hoses. There was never any mention of the vent tube in the carb installation instructions but it's come to my attention that I should install one. 6. The service manual just show them attached to the carb but ending unconnected in space. Arctic Cat Hose, Vent - Carburator (0410-056) is used in Carburetor assembly for 2006 Arctic Cat Prowler XT 650 H1 Automatic 4X4 Cat Green, Carburetor assembly for 2006 Arctic Cat Prowler XT 650 H1 Automatic 4X4 Green, Carburetor assembly for 2008 Arctic Cat Prowler 650 H1 Automatic 4X4 Green, Carburetor assembly for 2007 Arctic Cat Prowler XT 650 H1 Automatic 4X4 Red and Carburetor … Carburetors, contrary to popular opinion, are a very basic device similar in relative design since Henry Ford and his Model T. The same basic things make them tick no matter who designed it. 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