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How to adjust carburetor mixture screws

Here's how to find and adjust the mixture screws on your carburetor. Note that metering-block style carbs such as Holley and Demon more often have one or 2 mixture screws in each metering block depending on the number of venturi. Also those may not be located at the bottom of the carb as in factory carburetors.


 


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Adjust the Gas / Idle Mixture Screws on Your Edelbrock Carburetor
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How a carburetor works, schemes and explanations
This video explains, not in too much detail, how a 28mm Walbro diaphragm carburetor works (using mainly schemes to point out what happens inside). It explains what occurs at the venturi, what the butterfly valve is for, how the needle doses the amount of fuel, and how does the diaphragm slide adjust itself.





Auto Repair & Maintenance : How to Adjust Carburetors
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Holley carb adjustment basics
-just a quick overview of how to adjust a holley and what to know. happy to answer any tuning issues. i know far more than id like to about these old holleys. not a very good public speaker clearly. HOLLEY CARB FLOODING & HARD STARTING SOLUTIONS http://youtu.be/hn4HovYvrF0





Carburador VM
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Everything you wanted to know about automatic chokes but were afraid to ask
I've noticed many people drive vehicles with inoperative chokes. Even though chokes can be intimidating, repairing and adjusting them actually is very simple. So, stop pumping that accelerator and follow along as we look at how chokes work and how to repair them.





Rochester Carburetor Trick!
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DIY Carburetor Synchronize / Balance Tool
This is a homemade bottle style carburetor synchronization tool ( homemade manometer ) and balancing tool. If you are going to attempt to, or want to know how to sync your carburetors, there are a few things to know first. 1. Carburetor Synchronization = Adjusting your carburetor throttle plates or throttle slides so they move from your carburetors idle setting to wide open throttle simultaneously, or in sync with each other. 2. Balancing Carburetors = Adjusting your carburetors so they allow each cylinder to flow or pull the same amount of air and fuel at your desired idle speed. Carburetor sync and carburetor balancing go hand in hand. 3. Idle speed screw adjustments must be made at normal operation temperatures. 4. Air fuel mixture screw adjustments must be made at normal operating temperatures. 5. Air fuel mixture adjustments only affect your carburetors pilot circuit, which means from idle to part throttle. Air fuel mixture screw adjustments have zero effect on wide open throttle. 6. Carburetor running rich = Too much gas not enough air. Carburetor running lean = Too much air not enough gas. 7. Wide open throttle rich or lean conditions are adjusted two ways: A. Carburetors with throttle slides have a clip on the carburetor main jet needle. Raising the main jet needle clip drops the needle deeper into the main jet and will lean the carburetor out. Lowering the main jet needle clip will raise the needle and enrich your carburetors mix. B. Carburetors with throttle plates (butterfly style) need to have the carburetors main jet changed to a larger diameter jet to richen the mix or a smaller diameter jet to lean your mix. 8. If your engine will not idle correctly or your air fuel mixture screws seem to have no affect on the engine at idle, then most likely your pilot jet circuit is clogged and you should clean it. The snowmobile in the video is a 1986 Arctic cat cougar 500 fan cooled, it has Mikuni vm34 roundslide carburetors which have a primer nipple on the engine side of the throttle slide. Perfect place to attach a homemade manometer to balance everything. These mikuni vm34 roundslide carburetors were common on many motorcycles, snowmobiles and atv's. Suzuki, yamaha, polaris, arctic cat, all used them at one time or another, they are good carburetors when they are dialed in.





Setting the timing and adjusting the carb
Set the timing by ear, and got the idle slowed down so I could do a little adjusting on the carb. I'll do more when it's cold, so I can set the choke and all. Love the way it's sounding..





Randy's Cycle Service Explains Carburetors, Choke & Cold Starting - vintage motorcycles @ rcycle.com
Randy's Cycle Service Explains Carburetors, Choke & Cold Starting - vintage motorcycles. Randy's Cycle Service & Restoration in central Virginia USA. We service & restore all makes & models. We do not source or stock parts or sell vehicles. Technical advice starting at $25. Randy's Cycle Service & Restoration, www.rcycle.com





How Motorcycle Carburetors work and how to tune and clean them
Here's a link to the kind of carb cleaner I like best (it IS the best) http://www.amazon.com/gp/product/B002ERT666/ref=as_li_qf_sp_asin_il_tl?ie=U TF8&camp=1789&creative=9325&creativeASIN=B002ERT666&linkCode=as2&tag=httpww wyou00f-20 hey... awesome video..nicely explained ! just one question. Please do tel me wts AIR NEEDLE and LOW JET used for again. ? i mean how and what do they work? thanx :) Reply · The air needle is like a transitional restriction to increase vacuum pressure and tapered to prime the main jet flow gradually to ramp up fuel flow from the idle/low circuit to the main circuit. Think of the circuits like gears or stairs. The needle covers transition between 3rd gear to about 5th gear on a six speed. It overlaps basically. Fuel is getting by it from the idle/low- on through to where it's completely out of the way of the main jet and the main jet fuel flow is roaring like the straw/compressor example. Without the needle the carb would work, but not as smoothly through middle throttle (where most people ride and have the most fine input or throttle roll back and forth. The low jet is like second gear on a transmission. You can shift from 1st to 3rd, but again you risk stalling and it won't be as smooth. Also there isn't really the mechanical inertia to carry the process on like you have with a rolling vehicle with a flywheel on the engine and the wheels turning. The pistons still create vacuum every other time they go down, but air just doesn't have the punch that steel does when in motion. The circuits in a carburetor have to be there or you would have a limit on RPM range. An idle jet can't deliver enough fuel to really scream, and the main jet couldn't go slow and would be VERY hard to start because the engine would have to be spun up really fast. So you have usually four or five circuits (I want to say jets, but their physically different) that get air flow like stairs as the throttle opens. They are typically 1. Starting circuit (choke on) 2. Idle circuit 3. low jet 4. Jet Needle 5. Main jet. How Motorcycle Carburetors work and how to tune and clean them Check out my other channel here http://www.youtube.com/watch?v=1KKvwMaIotA





How To Find A Vacuum Leak - EricTheCarGuy
Vacuum leaks are one of the biggest causes of engine performance problems. This video is pretty straight forward in it's approach to finding a vacuum leak. On thing I might mention is that not all vacuum leaks are at the engine. Some HVAC systems run on engine vacuum and can cause a leak under the dash in some cases. I've even seen vacuum operated door locks. Just be sure to be careful spraying flammable stuff on a hot engine, you don't want to take one problem and make it a whole lot worse. You can also use a spray bottle with water to do this same test. It may not be as effective, but you don't have to worry about spraying a flammable substance on a hot engine. For more information on diagnosing engine performance issues, check out this article I wrote. http://www.ericthecarguy.com/faq/solving-automotive-performance-issues The best place for answers to your automotive questions: http://www.ericthecarguy.com Facebook: https://www.facebook.com/EricTheCarGuy?fref=ts Twitter: https://twitter.com/EricTheCarGuy Google+: https://plus.google.com/100195180196698058780/posts Information on Premium Membership: https://www.ericthecarguy.com/premium-content-streaming-etcg-content Stay Dirty ETCG Due to factors beyond the control of EricTheCarGuy, it cannot guarantee against unauthorized modifications of this information, or improper use of this information.  EricTheCarGuy assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. EricTheCarGuy recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video.  Due to factors beyond the control of EricTheCarGuy, no information contained in this video shall create any express or implied warranty or guarantee of any particular result.  Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not EricTheCarGuy.





How To Adjust The Idle Mixture Screws On Holley Carburetors
Tips on adjusting the idle mixture on Holley carburetors, using a simple vacuum gauge. Proper idle mixture adjustments can prevent bogging, hesitation, rough idle, backfire, stalling and hard starting. Additional information can be found on Holley's Blog: http://forums.holley.com/entry.php?429-How-To-Adjust-The-Idle-Mixture-On-Ho lley-Carbs





Motorcraft 2 bbl adjustment
Heres the adjustment process for my 72 f-100 motorcraft carburetor





Two-Stroke Scooter / ATV Carburetor Settings And Adjustments 2of4 : Idle Speed & Mixture
Part 2 of a 4 part video detailing all of the basic settings and adjustments of the carburetors found on Minarelli / Jog / 1E40QMB powered 50-90cc scooters and youth ATVs. Part 2 shows how to adjust the idle speed and mixture settings. Please like the video if you found it to be helpful.





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