Holley Carburetor Model 4160 Instruction Sheet 199R8339 TYPICAL VIEW The exploded view shown is typical of the model carburetor this kit will service. This 1848 Carb has a 600 CFM Base Plate on it. Holley 850 Double pumper carb The reason I need to jet it down is, Its kinda haer to start up, like its flooding out, and it acts like its trying to flood at wot, and also it will die when I get back to idle after a hard run. Look for leaks out the bottom overnight. On one side of the diaphram is fuel and the other is air. When I pulled the carb, it was overflowing with gas. I checked that and fuel level at idle, everything was fine. Virginia St. Then I pulled out the pipe vents and made my own avenger vent, added a bowl whistle, soldered over jets 3/4" to extended the jetsand threw it on,,,,, really running good now. txt) or read online for free. I cant get it to idle at the ideal " 750" rpms once it warms up. I've heard that there are several cures for it. Just turn on the pump and it shoots gas out the tubes. Check out Beasty258 1978 Chevrolet El Camino in Navarre,FL for ride specification, modification info and photos and follow Beasty258's 1978 Chevrolet El Camino for updates at CarDomain. 5 power valve, took out the balance tube rearange and located the engine vent to the carb base. According to Holley and many blogs I have read, on a Holley carb anything ober 7. Get the best deal for Holley Car & Truck Carburetor Parts from the largest online selection at eBay. i run a 1406 on my duster and after running it , then shutting it off when its hot outside, i get the infamous fuel percolation and can smell gas from outside the car ,but i never smell it on the inside. Float Bowl Vent Brass Tube-Carburetor brass vent tube. It is ok to lower the vent tubes if absolutely necessary, but you will begin to run the risk of fuel spilling over in the turns if you are not careful. On a automotive pump the air side is vented with a small pin hole to the outside and marine pumps will have a vent tube (your clear tube) up to the carb. Throttle shafts also get special machining attention. Do not move the secondary float bowl to the primary and vice versa. The first photo is the old school method of elevating the vents so that fuel doesn't puke out the vent and into the carb. In order to get that out the "J" tube vent has to come out. Ford& Holley Only. Fuel was sitting in the venturis, coming out the baseplate gasket, and leaking out the accelerator pump. The venturi is a restriction inside the carburetor that forces air to speed up to get through. La Porte, TX 77571 832-221-4007 Reasons why we do not allow any one to drop off or pick up carburetors at our shop The steal stuff They try to see how we do it so they can fix their own next time They waste our time talking to our workers They try to bring vehicles here after they install them for us to. It is dribbling fuel up out of the float bowl vent tube? I took off the float bowl and the float looks fine, the car ran fine until yesterday when I went to start it, it went wacky! I put it back together and it still does it. Check out our 2100 carburetor kits. Inside this tube, there is a narrowing at some point, and which is known as the venturi. The idea is fuel could slosh back and furth between the bowls with out dripping into the carb and causing sputtering/flooding. Found out my carb had a nice crack in the side of it :( so Ive been searching for a new-to-me carb for some time. Most tubing benders will leave you enough length on the legs that you can adjust the height. I have to make sure i shut feul off when done riding, or it won't start. I had a down track issue about 6-7 years ago that was nothing more than my rear float sticking, the needle not shutting and flooding the crap out of my carb (fuel coming out the vent tubes). Remove the top of the carb. On my olds 455 iI had in my k boat, it ran great with the quadra-junk carb, till one season I put it in the water and she was done. My question is this: I just bought a new choke from Advanced and the orifice that goes to the vacuum line to the front of the carb is really small compared to the old one. If you notice that this component is damaged, replace it with a reinforced rubber fuel hose. I've heard that there are several cures for it. I haven't had a carburetor on a 40 since 1990 but in the 70s and 80s I tried Holley, Carter and Weber. By use of the internal vent, we are able to maintain this balance between the pressure pushing down on top of the fuel in the float bowl with the pressure of the. If you are having float issues then the carb is flooding out of the vent tube pressed into the top of the carb (a quarter inch round brass tube and cut at forty-five degree angle). Carb leaking gas from float bowl drain. Check out entire fuel system venting system, including the vent valve on the carb, the charcoal canister, all hoses & check valves in the system, and any solenoids that trigger the vent system. If I run them higher fuel comes out of the vent tubes at about 4200rpm, when the car has been driven about 10 miles ,the fuel pressure never moves from the set 6. The reason for bending the tubes inward is that if flooding should occur, the fuel that would normally come out of the fuel bowl vent tube is rerouted back into the carburetor. 49; Visit our Facebook page and check out the Carb Doc's. Why does the choke help an engine start when it is cold? I know that the choke restricts the air flow and thus makes the mixture of air/gas entering the engine more concentrated with fuel, but why would that make it easier for the engine to start on a cold day? Shouldn't the engine be easiest to. Extended the float bowl vent tubes. Even though it is a 2-barrel carb, I think Curly might be on the right track. Holley manufactures a number of regulators for most any need. REPLACED IT. If your running the factory carb. I have never seen a truely bad carb; just some are better than others for certain applications. I have checked the float level and function several times now. This results from plugged carburetor circuits. Power valve blown. I called the shop. Specifications are in the carburetor kit instruction sheet. I would imagine there is a whole lot of fuel slosh going on in a derby type event. I bought a box stock Holley 770 that I can keep with me for the long trips in case the Holley EFI poops out. 9 consistently. But what I meant was does the tank need a vent?. If you're reading this you've likely asked a question about crank case ventilation, catch can placement, correct PCV hose routing, or similar. General Scooter Section. prevent less flooding. This is one of the purposes of the vent. 1/32nd of an inch can make all the difference in the world when setting some of them up. Holley Fuel Bowl Vent Tube Spill Reduction Valves Tutorial Overview http://www. I have never seen a truely bad carb; just some are better than others for certain applications. I can take the valve out and can not even blow through it, I use a air line to do that. Running in a rich state has two basic possibilities. As I lifted the bonnet, the top of the carb (primary side) had looked as if it had flooded and was soak and wet. 9 consistently. Safety tube to prevent fuel from flooding outside of the carburetor. 3) Replace the power valve. The reason for bending the tubes inward is that if flooding should occur, the fuel that would normally come out of the fuel bowl vent tube is rerouted back into the carburetor. A Holley is a very tunable carbbut it's not the easiest to tune. Place the carb on 3 tall sockets on your workbench so you can see the bottom of the carb, and fill the bowl with fuel by pouring about 1-1/2 ounces of fuel down the vent tube. When disconnecting the line from the carb, plenty of fuel gets shot into a bottle while cranking, but I don't think that's a good test. i checked and the floats are working fine. started out morning assembling a holly carb. I've had the bad rubber tip on the needle and the sunk float before. I have a bunch of fuel that is rush out of my vent tube. Buying Request Hub makes it simple, with just a few steps: post a Buying Request and when it’s approved, suppliers on our site can quote. It doen't have to be a marine carb. My float is good, i stuck it in a bucket full of water and it stayed a float. He has adjusted the floats. 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks - Gas coming out of carb. I pulled the air cleaner and sprayed Gummout on the linkages, choke plate, and air bleeds. Starter told little brother if he could make a complete run he'd get the win and go on to the next round. I called the shop. Parents and fans turned out for Venice swim team match against Booker High and and Cardinal Mooney High School on Tuesday. I highly recommend this modification, it solved the problem I had with the engine. If the fuel sloshes up and out the vent there is a good chance that fuel will just dump through the ventures and cut you off. 7/21/2009 9/22/2009 9/16/2009. In our neck of the woods, it happens if there is a hot day in the spring before the winter gas is out of the. The float valve may not ever shut off during high throttle operation just to maintain some fuel level in there. I would try adding an extension tube to the bowl vent. 1024 x 1502, 223K: Cylinder Block & Related Parts, External 6 Cylinder 240 and 300 engines. Looking for a 1974 Chevrolet C10 Pickup Carburetor? Get yours at Wholesale Prices and Free Shipping over $50 only here at AutoPartsWarehouse!. Found a holley 500 2 barrel carb for my jeep so just bought it today. He run it most of the summer of his drag car. Starter told little brother if he could make a complete run he'd get the win and go on to the next round. If not, then the carburetor probably needs to be cleaned. Holley 850 Double pumper carb The reason I need to jet it down is, Its kinda haer to start up, like its flooding out, and it acts like its trying to flood at wot, and also it will die when I get back to idle after a hard run. Its unique metering block eliminates fuel spillover through the boosters at extreme angles allowing for 40 degree climbing, 30 degree side-hill maneuvers and nose-down descents to avoid hesitations, stalling and flooding typically associated with carbs in an off- road environment. Remove the top of the carb. These tubes oftentimes are referred to as "J" tubes, as a result. it is a Holley 1850-2 carb. Be interesting to see if the pressure does rise at the carb when alt output is at 18V+. The problem I'm having is that after it runs for a short time say 1-2 mins it floods thru the vent tube in the front of the carb, that's the tube closest to the front of the truck. Holley leaves these out to prevent a loose screw from dropping down inside the intake manifold when the engine is running. That's the cleanest "dirty" carb I've seen in a long time. i knew i missed something lol , the bowl vent on a carb that isnt connected will allow fumes out as well. Off Topic Section. You Most Likely are seeing the Carb Overflow tube,,from Lower/rear of Carb's float bowl. Since the early 1980's, the Edelbrock Total Power Package System has solved the parts matching puzzle for many street performance enthusiasts. A friend has a Quick Fuel carb. Do not move the secondary float bowl to the primary and vice versa. After running for about a minute gas floods the primary bowl and out of the vent tube. The vent tubes of a marine carburetor are bent inwards so that the tube looks like an inverted "J". Some of the basic steps involve checking float levels, and adjusting for proper fuel pressure. When I went to start the car gas literally shot out of the primary vent tube. Holley fuel bowl vent baffles are used with the center-hung style fuel bowl. Consult your Briggs & Stratton Authorized Dealer for the proper tightening torque. It does this by measuring the amount of air necessary for the speed at which you wish to travel: it pulls a small amount of air and fuel for low speeds, increasing that amount as you speed up. The old vent canister was cracked open and the old plastic vent line from it to the tank was cracked in several places so I had removed it long ago and plugged the vent tube on the carb and the vent line going into the tank. When adjusting the secondary float and level is correct, I put my finger over the hole for float level and the carb would feed gas into the venturi and flood engine. An EFI is the best thing for most any angle except inverted. Is that to the left or clockwise. In order to replace the vent cap with the (expensive) sending unit. 7/21/2009 9/22/2009 9/16/2009. That stuff is nasty nasty nasty to. From that description it sure sounds like the carb is boiling over out the vent tube and flooding it. Why engines want to stall under hard braking??? from www. Engine Assembly - 6 Cylinder 240 and 300 - Typical 1965-1972. I don't understand how it can be flooding out with the vent tube arrangement as it is. Folks think that all of a sudden new "bad gas" has made it harder to use a carburetor. 6/15/2009 5/21/2012 7/29/2012 6/15/2009 6005. THIS CARBURETOR WAS PURCHASED NEW AND USED JUST 10-HOURS THEN CHANGED FOR A LARGER CARB. This isn't an issue on an automobile carb since the vent tube is straight up and not in the way. Holley® has been the undisputed leader in fuel systems for over 100 years. Dvd; Games; Software. If I run them higher fuel comes out of the vent tubes at about 4200rpm, when the car has been driven about 10 miles ,the fuel pressure never moves from the set 6. I do not ever see the clamps falling off. I have a 1989 Mercruiser 4. Carb is a replaced unit, not the origional. The hot tip in diets now is low-carb and Atkins friendly. my holley 390 four barrell. This picture shows the four small vent tubes that can get clogged. Now, Holley EFI products power these cars and are dominating the performance world. This then falls into the carb and floods it out. chevy rated this holley at 780cfm. They have spring loaded needles, metering blocks that eliminate spillover through the boosters at extreme angles, and a vent tube that keeps overflowing fuel from flooding your engine. Motorcraft 2100 Carburetor Choke Circuit. Looking for a 1977 Ford F-150 Carburetor? Get yours at Wholesale Prices and Free Shipping over $50 only here at AutoPartsWarehouse!. Second brand new Holley carb flooding? the primary bowl vent tube and the secondary vent tube with a piece of rubber hose with an oval cut out of the top of the. Year: Trans: Description: Type: Part # 1. Fill every square inch of that space with soft packing. Holley vent tube anti-spill valves add extra protection to the carburetor of your race car. If not, then the carburetor probably needs to be cleaned. Then I noticed that one of the brass tubes that is fitted in the top of the carb had come out and was laying in the bottom of the carb. Why is gas coming from vent pipe on holley 4180 carburetor? Will flooding a carburetor result in raw fuel coming from the exhaust pipe? as long as the water coming out of the pipe has a. I premix the fuel as the oil tank was previously removed. It's kind of an erratic gush every two or three seconds. 1966 Rochester Quadrajet used on 327 Chevrolet engine with manual transmission, no. A hose with a slit for the filter stud would poor the fuel right into the top of the carb causing sputtering and. I filled a clean wash bottle with fuel and artificially raised the fuel level by injecting a slow, but steady stream of fuel into the vent tube. If it pours out, then its fuel level. Starter told little brother if he could make a complete run he'd get the win and go on to the next round. I was able to get the car going with great success. Google allows users to search the Web for images, news, products, video, and other content. Some of the basic steps involve checking float levels, and adjusting for proper fuel pressure. The needle valve is part 42, it sets horizontally in the carb. on and went back to the factory 830cfm. started acting up this weekend at the track. The reason for bending the tubes inward is that if flooding should occur, the fuel that would normally come out of the fuel bowl vent tube is rerouted back into the carburetor. Holley 4180 vent tube plumbing If this is your first visit, be sure to check out the FAQ by clicking the link above. There are two areas that causes vapor lock in our old Fords. of adjustment if you have fuel coming out of the vent tube. main metering jets main body ass'y. That because the guy in the other lane did a burn out past the line which was forbidden for the class we were running and eliminated himself. Notice: Undefined index: HTTP_REFERER in /home/baeletrica/www/4uhx3o/5yos. Carb Float Needle. If you have this problem, try priming the carburetor by using an eyedropper and filling the carburetor bowl through the bowl vent prior to cranking the engine. Fuel flooding out of bowl vent tubes (Holley 4180) After a lot of searching and finding just a single post with a similar issue (but different fuel pump) I'm taking a guess, but wanted some input. I think the copper pipe is more or less of a vent pipe, for the fuel bowl. By use of the internal vent, we are able to maintain this balance between the pressure pushing down on top of the fuel in the float bowl with the pressure of the. Carb is a replaced unit, not the origional. prevent less flooding. If you notice that this component is damaged, replace it with a reinforced rubber fuel hose. Starter told little brother if he could make a complete run he'd get the win and go on to the next round. On Holley carbs,will it help its off-road performance if I extend the float bowl vent tube an inch or two? Seems like I remember when I had a Holley 600 carb on my '62 Chevy,when I got on steep hills,the float bowl would drain through the vent tube into the engine and flood it. Help, please! I was checking my timing & I took the car up to 3000 RPM's for a couple minutes. He has adjusted the floats. I would try adding an extension tube to the bowl vent. The Gas would come out of the two small slot in the venture right above the butterflies on the secondary float side. Across this tube, there is an adjustable circular plate known as a throttle plate. Ive replaced accel pump, dash pot, needle seat, float. ford truck carburetor question. I replaced and checked the floats and they were good, needle and seat are good. My Holley 4160 is still shooting fuel out of the vent tube of the secondaries. The full manifold vacuum sources 7a and 7b provide vacuum for operation of the air cleaner, transmission, and accessories. Float Circuit. i also removed the charcoal canister. 1985 oil is coming out vent hose in the carburetor replased oil filter checked all hose. I check my fuel pressure and it is 5psi. flooding holley - posted in Engine: what would cause my 750 hp to flood ,when i turn it over it pumps out the vent tubes?. they systems I have seen are almost plug and play. You may have to register before you can post: click the register link above to proceed. ultimaproducts. VHS'Joe Keteyian competes in the 200 meter freestyle. If you believe an item has gone missing first contact your local royal mail sorting office to see if it is bei. The reason for bending the tubes inward is that if flooding should occur, the fuel that would normally come out of the fuel bowl vent tube is rerouted back into the carburetor. This kit may contain more parts than are actually required to service a given carburetor. A fuel leak, starting from the carburetor's vent tube, can be worrisome affair for many motorcyclists. Even though it is a 2-barrel carb, I think Curly might be on the right track. Holley went on, cranked for about 20 seconds and it fired and started on fast idle. On one side of the diaphram is fuel and the other is air. Folks think that all of a sudden new "bad gas" has made it harder to use a carburetor. Re: Holley carb flooding Start simple, Open the sight plugs and see where the fuel is sitting. I need help on how to lean my Holley 600 out. Otherwise, the fitting must be capped, using the plug provided. Bottom line, having run both, the 32/36 is a good carb for certain applications. the carb was always flooding, turned out the points were burnt out and there was very little spark to process the fuel, now this car is. I premix the fuel as the oil tank was previously removed. She starts cranking and the engine gets a few rpms, then gas starts shooting out of the front vent tube on my 750 Holley. If not, then the carburetor probably needs to be cleaned. I then took the air cleaner off and just turned the key to run the fuel pump and gas shot up out of the carb. My question is this: I just bought a new choke from Advanced and the orifice that goes to the vacuum line to the front of the carb is really small compared to the old one. The little tube that comes out of the bottom of the float bowl is for draining the float bowl. If fuel is gushing out of the vent tubes on the top of the carb, that means that your needle and seat assembly is not working correctly. 3) Replace the power valve. it need a rebuild, its the Rochester 800. Spraying carburetor cleaner in that tube will only raise the liquid level in the bowl. This chart is intended to be a helpful guide when troubleshooting your carburetor. Then I noticed that one of the brass tubes that is fitted in the top of the carb had come out and was laying in the bottom of the carb. When the engine is. According to Holley and many blogs I have read, on a Holley carb anything ober 7. I wonder if Sta-Bil or something similar additive will raise the boiling point? Constant hot start flooding is really not good for the engine either. 6/15/2009 5/21/2012 7/29/2012 6/15/2009 6005. A hose with a slit for the filter stud would poor the fuel right into the top of the carb causing sputtering and. txt) or read online for free. I have never seen a truely bad carb; just some are better than others for certain applications. Gas out the vent, gas from accelerator pump linkage, gas from bowl vent gasket. Holley® has been the undisputed leader in fuel systems for over 100 years. When adjusting the secondary float and level is correct, I put my finger over the hole for float level and the carb would feed gas into the venturi and flood engine. And it turns out the carburetor is rich because the fuel going into the bowl is aerated and the vent tube cannot vent off the extra pressure. Parents and fans turned out for Venice swim team match against Booker High and and Cardinal Mooney High School on Tuesday. In order to get that out the "J" tube vent has to come out. Unless you are visually seeing the fuel shoot out the vent and into the venturi, it's most likely coming out of the boosters. Almost half a tank of fuel was dumped out of it while the bike was being ridden. NewOverall length 1. Browse our daily deals for even more savings! Free delivery and free returns on eBay Plus items!. I Installed Webers once, had a hell of a time getting them adjusted, found out the Carb linkage was twisting at WOT making them go out of Sync. Holley carburetors powered every Monster Energy NASCAR® Cup team and nearly every NHRA® Pro-Stock champion for four decades. Did not run long enough to test stalling issue. The next area for fuel control is the carb float needle. Take your carb cleaner with the extended nozzle and spray in both holes, flooding both sides. If it pours out, then its fuel level. Replaced needle and seat same issue, adjusted float level same issue. I feared the sender was again unseated so I pulled the tank down again. The more I think about it this was probably due to fuel leaking from the carb again. In this Video, we explain the Holley Carburetor Vent Systen. I also saw fuel comming out of the vent tube. well I put the second rebuild on last night and it started flooding almost right away, couldnt even keep the engine running unless the pcv hose was disconnected and the carb leaned right out, so I put on the carb I rebuilt again, the car started right up and ran well, I drove a few miles last night, then started it again this morning and drove it again, all was well so I gave it back to my son. Most tubing benders will leave you enough length on the legs that you can adjust the height. Engine Assembly - 6 Cylinder 240 and 300 - Typical 1965-1972. If I can't get get figured out I will never buy another Holley. the aisin looks nothing like the weber. also started seeing smoke coming from out of the front vent tube when this stared happening. Today whilst we were out on a ride, a mate 2000era XR400R started pouring fuel out of the air vent/drain tubes (number (17) on the diagram below). Other Projects. Volvo Penta 3. Now, Holley EFI products power these cars and are dominating the performance world. This in effect, extends the vent tubes a couple of inches and improves the carbs ablity to support extreme angles by reducing the possibility of flooding via the vent tubes. with 4160 you can add a fine screen wire baffle between the gasket and the main body since you can not use the holley whistle baffle they sell. Its unique metering block eliminates fuel spillover through the boosters at extreme angles allowing for 40 degree climbing, 30 degree side-hill maneuvers and nose-down descents to avoid hesitations, stalling and flooding typically associated with carbs in an off- road environment. main metering jets main body ass'y. There's nothing worse than to be in traffic and the car dies and you hope you can roll into a parking spot!!! That's what happened to me and then opened the hood and find gas running down the carb. She starts cranking and the engine gets a few rpms, then gas starts shooting out of the front vent tube on my 750 Holley. Shop for Top Selling Genuine Ford Bronco Fuel Filters We Stock the following top leading brands, including Interfil, Hastings, Premium Guard Constantly Updated Inventory of Ford Bronco Replacement Fuel Filter Parts. That stuff is nasty nasty nasty to. make a crossover vent tube I did this by copying one of their. Power valve blown. There is a single small vent tube (think vacuum hose) exiting the top of the tank. If fuel is gushing out of the vent tubes on the top of the carb, that means that your needle and seat assembly is not working correctly. I would try adding an extension tube to the bowl vent. I adjusted the float level and looked at the needle of the first 750 and it didn't help. carb was just gone threw. I did the off-road needles and seats and lowered the fuel bowl levels and still ol' yeller is flooding while bouncing around. A hose with a slit for the filter stud would poor the fuel right into the top of the carb causing sputtering and. There's nothing worse than to be in traffic and the car dies and you hope you can roll into a parking spot!!! That's what happened to me and then opened the hood and find gas running down the carb. it need a rebuild, its the Rochester 800. ford truck carburetor question. Now its pumping fuel out of the secondary vent tube. How could crank case pressure get from the engine to the fuel tank when the only connections between the fuel tank and the engine are wiring harness and fuel feed line??. The burst of fresh fuel will sometimes clean the needle and seat and straighten it up. What fixed my problem: "Well I took the top off the carb, inspected the accel pump plunger. 111 Primary Metering Body Filler 112 Vacuum Tube 127 Fuel Line Tube O -Ring Seal 128 Fuel Line Tube 129 Secondary Bowl Vent. The reason for bending the tubes inward is that if flooding should occur, the fuel that would normally come out of the fuel bowl vent tube is rerouted back into the carburetor. This carb has annular boosters in all 4 barrels!. I'm talking a 2" high shot of gas. Preparation. they will cause flooding afterthe burnout. In the venturi is where a vacuum is created. If you're reading this you've likely asked a question about crank case ventilation, catch can placement, correct PCV hose routing, or similar. Carb Float Needle. May be percolating. The car ran perfect, took it out cruising a couple nights, then it sat for exactly 2 weeks. La Porte, TX 77571 832-221-4007 Reasons why we do not allow any one to drop off or pick up carburetors at our shop The steal stuff They try to see how we do it so they can fix their own next time They waste our time talking to our workers They try to bring vehicles here after they install them for us to. Have had my boat for about a year - 4. with 4160 you can add a fine screen wire baffle between the gasket and the main body since you can not use the holley whistle baffle they sell. Mixture screws are out 1 turn. No issues with the fuel lines as I pressure tested them when all this started. Inside a carburetor is a venturi, fig 1. I feared the sender was again unseated so I pulled the tank down again. CVP jet quality exceeds OEM and imported carburetor jets. If you get them closer than 3/4" for say, the air cleaner lid, the airflow that follows the air cleaner lid will draw on the tubes. The RPM model was too tall. But now the thing wont run hardly at all off road. Engine is a kenne bell 231. With the air cleaner removed, I could see my Holley 4150 starting to shoot gas out of the primary vent tube until I shut it off/it flooded moments later. The carburetor was flooding out. I can recall the first time I saw a first generation Camaro in the October 1966 Popular Science new car preview edition. Classic Industries offers a wide selection of All Makes parts, including All Makes interior parts and soft trim, All Makes exterior sheet metal, All Makes moldings, All Makes emblems, All Makes weatherstrip and unique accessories, to nearly every nut and bolt needed for installation. Then turn the adjustment about 3/4 turns counter-clockwise and start there. We have 4 Edelbrock Performer 1406 manuals available for free PDF download: Owner's Manual, Installation Instructions. The compensator opens a vent into the main body letting off some pressure when coming to an idle.