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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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Carburetor Adjustment Basics -EricTheCarGuy
In a way this is 'Part 3' of my carburetor series. In case you missed them, here's parts 1&2. Carburetor Rebuild Basics (Part 1): https://www.youtube.com/watch?v=85nszLpbbXY Carburetor Rebuild Basics (Part 2): https://www.youtube.com/watch?v=dprLQcQrAqE If you want to see the full version of the carburetor rebuild video with additional footage now, become a Premium Member of EricTheCarGuy.com: http://www.ericthecarguy.com/premium-content-streaming-etcg-content One of the most important parts of a carburetor rebuild is setting it up properly after you're done. There are also many times where a rebuild may not be necessary and you just need to perform some of these adjustments. Either way, I hope this video will help you should you need to adjust your carburetor. Tools. Vacuum Gauge: http://www.jbtoolsales.com/equus-3620-vacuum-gauge-fuel-pump-tester/#oid=10 02_1 Related videos. Finding Vacuum Leaks: https://www.youtube.com/watch?v=9CPqbaSgcok How To Check For Timing Chain Slack: https://www.youtube.com/watch?v=4_f5ukZVri8 Service Manuals: http://www.youtube.com/watch?v=IN95GLDvGBc Fairmont Drag Strip: https://www.youtube.com/watch?v=hkOdD0P38ps Cleaning Throttle Bodies: https://www.youtube.com/watch?v=41yFXjibtLY Solving Performance Problems 1: http://www.youtube.com/watch?v=rsGTeWayqIU Solving Performance Problems 2: http://www.youtube.com/watch?v=sAKwCzUE_9M Re Performance Problems: http://www.youtube.com/watch?v=_vAJi5rLMGY Related articles. Idle issues: http://www.ericthecarguy.com/faq/solving-automotive-idle-problems Performance issues: http://www.ericthecarguy.com/faq/solving-automotive-performance-issues Getting Better MPG: http://ericthecarguy.com/faq/finding-and-fixing-the-causes-of-poor-mpg Discussion about this Video: http://www.ericthecarguy.com/kunena/18-The-EricTheCarGuy-Video-Forum/52785- carburetor-adjustment-basics#107280 The best place for answers to your automotive questions: http://www.ericthecarguy.com ETCG FAQ Page: http://www.ericthecarguy.com/faq EricTheCarGuy code lookup: http://www.ericthecarguy.com/obd-code-lookup Facebook: https://www.facebook.com/EricTheCarGuy?fref=ts Twitter: https://twitter.com/EricTheCarGuy Google+: https://plus.google.com/100195180196698058780/posts Information on Premium Membership: http://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.





Rochester Carburetor Trick!
If your Rochester Quadrajet or Dualjet Carburetor is Hesitating try this Trick!





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.





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





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