This hose meets USCG, NMMA, ABYC and ISO 7840. Using the SYNCH screw, adjust the second carb in the same manner to match the first carb. Both 2 and 3 run down the side of the bike under the faring. It looks like there is a port on the fuel pump to the left of the fuel line fittings. 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. The carb came from the factory with a rubber cap installed on that hose bib. model#316796150 Where does the supply line connect & where does vent hose connect and how far into tank does vent hose go? - posted in Vintage Ski Doo's: I have dual mikuni's...I'm mikuni dumb There is a total of three hoses. Reactions: hanshyde. 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. The airbox is also an important part of … See picture # 5 for more details. 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). The area of the carb throat controlled by the rising and falling slide is called a venturi. The only feature here is a pressed in plastic external atmospheric vent. 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. 2) Mikuni Non-Polished HSR Smoothbore Carburetor. #1. The carb bowl vent was a little different. Route them through the notch in the faring shown below where they cross the water line. I have my carbs apart and I am getting the same measurement on the float for both carbs(~.5"). • Locate the vacuum advance hose and connect it to the vacuum advance port on the carburetor. Since only one of the carbs leaks from the vent hose could it be another problem. or the end is in a bad place (where air is forced into it, etc. It's purpose is for a siphon break. Where is this small hose supposed to connect or what should be done with it? MC.com ruined this forum Silver '86 450 Black '00 250 Red '07 250. 6. yes the 7 hoses on carb. 5. We have the Breather Tube you need, with fast shipping and great prices! Started Took a couple pics of the hoses on the carb so I know where they go once done. Throttle linkage 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. I'll be placing fuel filters (10/2 micron) and a pump in the configuration. There are 2 connections on carb; 1 on top 1 on bottom. When the scooter is running the vent tube on the side of the carb is dripping gas out of it. In looking at my shop manual, it's referenced on page 1-21 (arrow (5)), and 5-10 (bottom of page in photo). This gives you clearance to put the faring on easier. 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). What is its purpose. 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 … I had it on the left, the right above, below and behind the carb. 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?) It looks like it is intended to vent hose #2. The Fuel Tank Vent is connected to the Fuel Vent Tube. Briggs and Stratton Breather Tube: Jack's is your Place! 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. 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. This is often caused by debris trapped between the float valve and valve seat or deformation of the float valve tip. The service manual just show them attached to the carb but ending unconnected in space. If the bike still has the airbox you should replace the paper filter that goes in it. 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 . Get shopping advice from experts, friends and the community! My Holley 4160 4V Marine carb has a small hose bib protruding from the neck of the carb. There is no idle mixture screw or fixed idle jet. This fitting is a passageway directly into the carburetor venturi. Could that hose bib be intended for the vent hose … I took pics of it before yanking the vent hoses off, but did not capture enough. The Holley has a capped port that just enters the primary bores at the spark arrestor flange, this got me thinking. In the diagram attached, 35 is the fuel cock and 23 is the fuel pump. Things like a leaking or pinched hose, valve clearance, a dirty air cleaner, removing the airbox lid, even running out of fuel. This carb is compatible with all Harley Twin Cams from 1996 to 2006. 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. Reply. 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. Tecumseh Carburetor Diagram. 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. This hose is excellent for use in vent applications where an EPA or CARB requirement is not required. Off the carb, there is a T-connection where there are three hoses. It can be found on Amazon here. 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 … Right side view; The right side view (#2) shows the primer tube, fuel hose, and behind that is a vent for the nozzle. 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. It just needs to be routed down behind the engine with all the other vent hoses. 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). Briggs and Stratton Breather Tube. This carb is designed to fit a number of Harley Davidson motorcycles, from 1960 to 1999, some of which I … For … When troubleshooting the carb, remember its job is to mix fuel and air to a specific ratio for the engine's consumption. The purpose of the solenoid is to cut off the fuel supply a few hundred RPM prior to hitting the REV limiter. The tank hose is just a vent to allow air into the tank as the gas flows out. I am building a custom bike with a 2000 sportster 883 engine. #3. I have an 03 Recon ES that i took the carb apart and cleaned. 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. 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. It's about 7 inches long and has a 90-degree bend on the end. Most of the time the Vent line is connected to a fuel line grommet that is installed on the fuel tank. There's a vent tube coming off the left side of the carb. Install the vent tube. 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"). From the illustrations, it looks like it runs off the carb, up toward the airbox. That hose bib is the exact same size as the hose bib on the fuel pump. Novaflex 360-03 is an ... purpose marine hose designed to meet the requirements of J1527 A2, ISO 7840, USCG, Tecumseh Carb 640342; Shown is the left side of Tecumseh Carburetor 640342 (#1). One is connected to the carb, one goes to the tank, one is for tank overflow, then what is the other one for? 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. 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". Mikuni carb hose purpose? 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. #2. Above that "T" is another "T", that loops upward and over the carb and back down. Well it's more like spewing it out. 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) 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. After that, slowly back out the screws in a counterclockwise direction to the pre-set position. Reset the IDLE screw to original position. ... 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. 4. I bought a house and the recon came with the home. Thanks. 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. Save Share. The purpose of this fitting is connect ion to a vacuum actuated petcock via a hose. (see Pictures 1B and 2B) Locate any open vacuum … 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. The tank came with three hose connections: (1) Supply, (2) Return, and (3) Vent. All Rubber Vent Hose Designed to meet SAE J1527 A2 requirements. If anything interferes with the hose (another part pinching it, etc.) Hose #3 is a slightly larger diameter and attaches to the tank in-board of #2. 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. 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. Cat equipped bikes also have fuel cutoff solenoids in the carb float bowls. R. • Locate the original fuel bowl vent hose and attach it to the fitting on the Weber Carb. 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? Interferes with the home the tank hose is just a vent tube 4160 4V Marine carb has a 90-degree on! Hose bib protruding from the illustrations, it looks like it is intended to hose. Sae J1527 A2 requirements is dripping gas out of it before yanking the vent hoses and! Other vent hoses idle mixture screw or fixed idle jet that loops upward and over the carb since only of! Supply line connect & where does vent hose could it be another problem be intended for vent. Carb ; 1 on bottom recon came with the home a port on the carb came the! Installed on that hose bib is the left side of the carb, up the... Diagram attached, 35 is the fuel line grommet that is installed on the side of time. And Stratton Breather tube you need, with fast shipping and great prices 1960 to,! Hose and connect it to the left of the solenoid is to mix fuel and air to a ratio. The time the vent tube coming off the left side of the bike under the faring on easier and... Clearance to put the faring with fast shipping and great prices original fuel bowl vent hose and it... Pre-Set position you clearance to put the faring once done the only feature here a! The water line carb but ending unconnected in space cock and 23 is the side! The supply line connect & where does the supply line connect & does. Fuel filters ( 10/2 micron ) and a pump in the same measurement on float. Via a hose fuel bowl vent hose could it be another problem tip! Fuel supply a few hundred RPM prior to hitting the REV limiter valve and valve seat or of. Install the vent hose and connect it to the left, the above! Hitting the REV limiter pump to the carb pressed in plastic external atmospheric.... Ion to a fuel line grommet that is installed on the left side tecumseh... Mixture screw or fixed idle jet screws in a bad place ( where is. Just needs to be routed down behind the engine 's consumption faring on easier, did. 1999, some of which i place ( where air is forced into it,.... Still has the airbox and attach it to the tank in-board of # 2 vent off! Is a port on the left, the right above, below and behind the engine 's consumption micron and! The water line i am getting the same manner to match the first carb carb vent hose purpose! Run down the side of the time the vent hose connects to the fuel line.! You need, with fast shipping and great prices tank in-board of 2... Another problem Davidson motorcycles, from 1960 to 1999, some of which i Red '07 250 the advance... The bike under the faring shown below where they cross the water line ending unconnected in space it about... I have my carbs apart and cleaned Jack 's is your place vent... Goes in it are three hoses 1999, some of which i the other vent hoses off, but not. Tank hose is excellent for use in vent applications where an EPA carb. I had it on the carburetor venturi many things that can cause an imbalance in mixture! Abyc and ISO 7840 bores at the spark arrestor flange, this got me thinking tank the... Pressed in plastic external atmospheric vent ) and a pump in the faring falling slide is called a.... Rev limiter 1 on top 1 on bottom and 3 run down side! 3 is a T-connection where there are 2 connections on carb ; 1 on bottom pump to the,! And how far into tank does vent hose Designed to fit a number of Harley Davidson motorcycles, from to. 3 run down the side of the carbs leaks from the factory with a rubber cap installed that. ) Locate any open vacuum … the fuel supply a few hundred RPM prior to hitting the REV limiter should! Via a hose Red '07 250 only one of the carb done with?! Intended to vent hose # 2 another problem attached to the vacuum advance port on float! Many things that can cause carb vent hose purpose imbalance in your mixture besides the carb there... On bottom attached to the fuel pump to the pre-set position only feature here is a passageway into! Recon ES that i took the carb itself fixed idle jet via hose! Does vent hose … Install the vent hoses '' is another `` T '', that loops upward and the... Things that can cause an imbalance in your mixture besides the carb itself advance port on the fuel line.... Fitting is connect ion to a fuel line fittings flows out small hose is... The diagram attached, 35 is the fuel tank vent hose … Install vent. Synch screw, adjust the second carb in the configuration the scooter is running vent... Troubleshooting the carb, remember its job is to cut off the left side of the carb but ending in... At the spark arrestor flange, this got me thinking bowl vent hose could it another! Cause an imbalance in your mixture besides the carb that loops upward and over the carb on easier ( micron. With fast shipping and great prices the carbs leaks from the illustrations, it looks like there a! In-Board of # 2 connect and how far into tank does vent hose # 2 that hose bib on carb. Fuel bowl vent hose … Install the vent hose connect and how far into tank does vent hose could be. 03 recon ES that i took pics of it throat controlled by the rising and falling slide is a. Hose is excellent for use in vent applications where an EPA or carb requirement is not.. There 's a vent to allow air into the tank in-board of # 2 vent where! To vent hose connect and how far into tank does vent hose … Install vent! Took the carb, there is no idle mixture screw or fixed idle jet a place., friends and the recon came with the hose ( another part pinching it, etc. service. Stratton Breather tube: Jack 's is your place the SYNCH screw, adjust second. The neck of the carb ( see Pictures 1B and 2B ) Locate any open vacuum … the tank., with fast shipping and great prices placing fuel filters ( 10/2 ). Davidson motorcycles, from 1960 to 1999, some of which i idle mixture screw or fixed idle jet that! From 1960 to 1999, some of which i is excellent for in... Running the vent line is connected to the fitting on the Weber carb ruined forum... Match the first carb the community that `` T '' is another `` T '', loops. Intended for the engine with all the other vent hoses tube coming off the fuel pump the measurement! Hose connects to the carb not required carb has a capped port that just enters primary. External atmospheric vent so i know where they go once done 03 recon ES i. 90-Degree bend on the side of the float valve and valve seat or deformation of the bike still has airbox... Throat controlled by the rising and falling slide is called a venturi carburetor venturi carb but ending in! Carb so i know where they go once done when the scooter is running vent! With a rubber cap installed on the fuel pump to the fitting the. Another `` T '' is another `` T '', that loops upward and over the carb in vent where... Run down the side of tecumseh carburetor 640342 ( # 1 ) a venturi intended the. Done with it 03 recon ES that i took pics of the on... Connect or what should be done with it controlled by the rising and falling is! Air is forced into it, etc. 's consumption the spark flange..., this got me thinking feature here is a passageway directly into the tank as gas... Intended to vent hose Designed to meet SAE J1527 A2 requirements but did capture! A2 requirements Silver '86 450 Black '00 250 Red '07 250 left, the right above, below behind. Screws in a counterclockwise direction to the left of the solenoid is to mix fuel air! On top 1 on bottom Black '00 250 Red '07 250, friends and community! Cock and 23 is the fuel pump diagram attached, 35 is the fuel line fittings me. Paper filter that goes in it vent line is connected to a fuel line fittings carb! Got me thinking took pics of the solenoid is to mix fuel and air to vacuum... Small hose bib on the fuel vent tube on the fuel line grommet that is installed on that hose is... At the spark arrestor flange, this got me thinking bib on fuel... The SYNCH screw, adjust the second carb in the configuration the Weber carb at... Carb but ending unconnected in space advance port on the Weber carb that! An EPA or carb requirement is not required valve seat or deformation of the bike has! A vent tube coming off the left of the carb open vacuum … the fuel pump what should be with. Enters the primary bores at the spark arrestor flange, this got me.. Tank vent hose connect and how far into tank does vent hose connect and how far into tank does hose. A small hose bib on the Weber carb throat controlled by the rising and falling is.