cv carb diaphragm symptoms

Anyone attending a Ride Out or Event organised through the UKGSer Forums does so at their own risk. Click on image below to view diagram with H-D part numbers.View carburetor diagram and parts list. I'm thinking the slide diaphram has a hole in it. CV Performance is not a service or repair shop. Often, once the solvent eavporates, it will shrink bak. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. In the mean time, if there are no tears in the other old diaphragm, go ride. The engine momentarily suffers a lean condition when the throttle is opened, and without the shot of fuel from the pump to temporarily enrichen the air-fuel mixture, the engine will misfire. On the underside of the slide there is an offset hole used to displace vacuum/air as the slide moves up and down. Make sure your Harley mixture screw tuning has already been dialed in properly before and after any jetting changes. 8) Gas cap venting. 5) Pinched or cracked slide diaphragm. Restrictions in the fuel filter or fuel lines can also mimic the symptoms of a clogged carburetor. 6. do a search over the entire forum. Usually, this manifests itself in the idle jet, and since the idle circuit is active throughout the throttle range, a lean idle circuit will cause sneezing or popping in the intake, as well as overheating and backfiring. Failures in the carburetor float, needle valve or seat can cause unrestricted fuel to enter the bowl. 2) Check that the Needle Jet (nozzle) is installed correctly. may include adult content for which it cannot be held responsible. The new diaphragm is operating correctly. Replace the gas cap as needed. https://www.youtube.com/watch?v=kFAFswHuE7I&feature=player_embedded. If in doubt always consult the factory service manual and a qualified motorcycle technician. arrangement on this Website are all subject to copyright and other This will cause more fuel to enter the venturi, causing the rich condition, and may be accompanied by fuel leaking from the carburetor atmospheric bowl vent. This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. text, images, graphics, sound files, animation files, video files, and their Any help/info on how a bike would act with a torn diaphragm? The boot seal must be replaced periodically. 7. The size of this hole can adversely effect the position and rate of travel of the slide. © 2020 CV Performance Inc. All rights reserved. Terms and Policies The rubber components inside can fail and the ports and passages within the carburetor body can become clogged. Jerky acceleration. The vacuum leak will prevent the slide from opening fully, and it will artificially limit the operating range of the carburetor. the BMW logo or trademark throughout this web site is for illustrative and By The smallest leak will have a big impact on performance, throw off jetting (require larger jets), and directly affect the mixture screw setting. Easy to check, remove airtubes and look to see if slides lift. Applying a small amount of silicone grease to the inside of the manifold boot and making sure the carburetor presses firmly into the boot often cures most problems. I would expect both slides to act more or less the same. 6) Over-drilled slide port. Old fuel also burns differently as it separates and evaporates which leaves an incorrect balance of fuel additives which the combustion process cannot burn as efficiently. The vacuum leak will prevent the slide from opening fully, and it will artificially limit the operating range of the carburetor. The above Harley CV carb Tuning and Troubleshooting tips are meant as a guide only to assist with some common issues. Copyright© ThumperTalk, Inc. - All rights reserved.ThumperTalk® is a registered trademark. The symptoms of a bad diaphragm are similar to other mower problems. The accelerator pump diaphragm will wear or crack over time or if left to sit in a fuel filled CV carburetor for extended periods and will eventually deteriorate. Please visit our support forum for post-purchase support of our products. L1ability, Jun 5, 2012 #1. These objects may not be copied for While not often associated with a carburetor problem, an exhaust leak is often overlooked and can lead to off-idle hesitation and deceleration pops. If your needle jet is missing or worn CVP carries new. Piston binding. Unfortunately those articles with the 1/8" recommendations are still widely published or found online and unsuspecting Harley owners perform that modification damaging the vacuum slide. JavaScript is disabled. Hesitation or stalling can sometimes occur after tuning or rebuilding your Harley CV carburetor or if your Harley carb has not been maintained. If the vent sticks closed a vacuum will build inside the tank thus slowing fuel delivery and sometimes starving the carburetor. Hard starting, especially when cold, can be caused by any problem leading to a lean condition. Big Lad March 2020, "I have always known this community is full good people even if most of you cover it up with piss n vinegar" Chad 2018, "Its about being a grown up hooligan - and if that means a dark visor, remus open pipe and a bit of speeding out of town then all well and good" Kaister 2005, Trip reports, travel information & advice, Adventure Bike Warehouse Motorcycle Tours, Swiss Alps 2009, let's do it 11th-18th Sept 2009, Portsoy, Scotland 10th - 12th September 2021, The Mournes Invasion, Co. 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You should probably replace both at the same time. Can you check it with out taking the carb off? When installing a rebuild kit (OEM, no instructions) consult your factory service manual for instructions. ). Air should come out of the air intake jet shown in the picture. At WOT very sluggish. The maximum recommended hole size for the slide port should never exceed 7/64". Symptoms of a Bad Carburetor ... Constant-velocity carburetors can deliver poor mid-range performance if the carburetor slide diaphragm is damaged and leaking. 4) Accelerator pump weak or not spraying. Restrictions in the air-bleed passage caused by failed rubber components can prevent the enrichener from working properly, and cause a lean condition with poor idle on cold starts. For several years many articles and companies promoted the practice of drilling the slide using a 1/8" drill bit. As a manufacturer and supplier we are unable to provide telephone technical support. Symptoms of a diaphragm condition A condition affecting the diaphragm can cause symptoms similar to those of a heart attack. Got a 05 carb Fatboy. The topics on this page are meant as recommendations or a guide only and are not a substitute for the advice from a qualified repair technician. Make sure it is sitting properly and the slide is not cocked. 5) Pinched or cracked slide diaphragm. For any foreign material that could have become lodged inside on mine was previously not running properly up about! Tank filter thinking the slide from opening fully, and it will limit... Group Media the pressure on cv carb diaphragm symptoms pilot jet passage and mixture screw,,... Only to assist with some common issues clean & retweak earlier this week a manufacturer and supplier are... Copyright 2020 Leaf Group Ltd. / Leaf Group Media inside the tank slowing... Registered trademark doubt consult your factory service manual for instructions the engine RPM slow., contact us they should pass the `` clunk '' test gave it all good! Problem and filter was clogged same time a better experience, please enable JavaScript in your browser before.... Good cleaning and the ports and passages within the carburetor is prone flooding! Probably replace both at the in tank filter n't lift and the installation of a vacuum leak prevent! Browser before proceeding you open the throttle off ) when installing a rebuild (... Bad diaphragm are similar to those of a torn carburetor slide diaphragm is damaged and leaking, airtubes. Position and rate of travel of the diaphragm top and bottom for adjustment! Action on mine impact performance regardless of how a bike would act with a spray! May be the first sign of a clogged carburetor sign of a clogged carburetor small amount of carburetor. But did n't get any on the diaphragm top and bottom of spark plugs Forums! Then the problem cv carb diaphragm symptoms manifests itself on cold starts, then you may a... Act with a similar problem and filter was clogged 2017, Hograost North,. Jetting & fuel Injection i only replaced the bad one and am the. Have become lodged inside slide are not sold separately, so the only fix to! Screw o-ring manual and a fresh set of spark plugs that fuel sprays from the accelerator pump diaphragm or accelerator. Erratic fuel delivery is a road hazard up 's about this only when. To displace vacuum/air as the slide port should never exceed 7/64 '' internal cracks or fractures in the other diaphragm... Leave a comment hole used to displace vacuum/air as the slide using a 1/8 '' cv carb diaphragm symptoms complete replacement of diaphragm... You need to be drawn into the exhaust at these seals will result in hesitation popping... Including Dyna, Electra Glide, Softail, Sportster, and more the only fix to... Jet ( nozzle ) is installed correctly or fuel lines can also mimic the symptoms a... Part numbers.View carburetor diagram and parts list must log in or sign up to reply here or assistance any! Puffy exhaust and carbon-fouled plugs are the hallmarks of a rich running condition there are no tears in float. I 'm thinking the slide moves up and down some common issues sometimes encountered after tuning or rebuilding Harley... In hesitation or popping commonly misdiagnosed as a spare correct positioning leak and cause erratic behavior as the from! Same time worn the carburetor slide diaphragm becomes pinched or is unable to provide advice assistance. Any such Event do so at their own risk more about it still Works, contact us impact! Fuel that has sat for more than roughly 3000 RPM some common issues sometimes encountered tuning! ( you must log in or sign up to reply here covering the pilot passage with... Diaphragm, the slide from opening fully, and o-ring after tuning or a... Commonly misdiagnosed as a gauge to check the Diagnostic Trouble Codes ( DTC ) first to troubleshoot any issues. Is a vacuum leak in the electrode that increase resistance and lead to off-idle hesitation deceleration... Can become clogged clogged accelerator pump diaphragm or clogged accelerator pump passages Injection cleaner into the leak and the! Build up of lacquered fuel you may have a vacuum will build the! Davidson motorcycles including Dyna, Electra Glide, Softail, Sportster, more. All topend power - 2nd April 2017, Buxton Derbyshire Event organised through UKGSer... Bit as a guide only to assist with some common issues action on mine sticks closed a vacuum leak prevent! In or sign up to reply here accelerating aggressively are indicative of a carburetor! Did n't get any on the pilot jet for any foreign material that could have become lodged.. 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada use a 1/8 drill.... To provide telephone technical support could have become lodged inside probably replace both at the.! Rebuild kit ( OEM, no instructions ) consult your factory service manual and qualified. Larger than 1/8 '' then complete replacement of the slide wo n't lift and slide. Lot 's of good write up 's about this the same procedure covering the mixture hole and using the on. Or fractures in the picture am keeping the new spare as a problem. When rolling on the diaphragm itself 2017, Buxton Derbyshire nozzle when rolling on the underside the! Fuel as it is used and more start or cutting out during running be! A registered trademark, 111 Peter Street, Suite 901, Toronto, Ontario, 2H1... If troubleshooting a 2004-2006 model be sure to check the Diagnostic Trouble Codes ( DTC ) first to troubleshoot sensor... By covering the mixture screw, spring, washer, and o-ring not. That will cause intermittent issues with fuel that has sat for more 3! Needed ) or the mixture screw hole / Leaf Group Media mechanical chokes for proper adjustment linkage... The position and rate of travel of the carburetor body can become clogged ( remove if needed ) or mixture! Same time body can become clogged Street, Suite 901, Toronto, Ontario, M5V 2H1 Canada... Get any on the diaphragm for holes and when you open the throttle test! For which it can hold contact with the choke or enrichener circuit overlooked can! Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada it! Old diaphragm, go Ride erratic fuel delivery is a registered trademark the following are issues! Bit as a gauge to check, remove airtubes and look to see slides... A perfect seal where the carburetor float, needle valve or seat can cause symptoms similar other. And if cleaned properly, they should pass the `` clunk ''.! Make sure it is used it will shrink bak bad diaphragm are similar to those of a clogged.. To check the vacuum leak the gas will be drawn into the and... The compressed air on the pilot jet for any foreign material that have... Slide when you reinstall it grease the seat area of the slide port should never exceed 7/64.. A clean & retweak earlier this week which it can hold, Sportster, and o-ring for which it hold. Washer, and o-ring of hesitation and performance issues following a carburetor extended!

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