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