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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


 


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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





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.





Reassembling Keihin PWK Carburetor
Reassembling Keihin PWK carburetor





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.





Yamaha 2 stroke basics (Builder) - Post By BoatTest.Com
http://www.boattest.com/vlibrary/vlist.aspx?s=Yamaha&BtnSearch=Video+Search &btArticle=Article#Others





Mikuni Carb series #4 How a Mikuni carb works.
Ever wonder how a carb works - I'll explain it.





how to clean and adjust your 4 stroke carb pitbike
this carb is from 110cc four stroke pitbike music is by offspring





Mikuni Carb Series # 3 assembly video with details.
This is how you assemble a cleaned mikuni carb.





Carburador VM
Carburador Venturi Movil Funciona operando el acelerador que directamente abre o cierra la cortina, aumentando o cerrando el paso de aire - gasolina! Opera perfectamente en motores de 2T en bajas y altas revoluciones, aunque en los motores de 4T opera mejor en bajas revoluciones.





1998 Kawasaki kx100 Keihin PE-26 carb rebuild
Carburetor rebuild of a 98 KX100, KX80 and other bikes with a Keihin PE 26 carb





CV Carburetor
How a cv carburetor works. Sound of a YAMAHA XTZ750 Super Tenere.





basic carburettor adjustment (tuning) 4 stroke, and how it works.
In this part 1 of two video i am showing you where the different parts and adjustments are on my old honda with a new carbie works on most small carbies. i will show you what to look for when tuning your carbie! please enjoy and watch my other videos. :D i will make a part 2 tomorrow! this one is on my honda xl100 1974 classic honda style, but is the same, for classic and new yamaha kawasaki suzuki and all small bikes pretty much. motorbikes and cars are simular. how to adjust the fuel air mixture and the idle speed. riding it to test the tuning.





carburetor design & simulation by Techmen Engineering(Pakistan)
Techmen Engineering Products Manufacturers. http://www.techmen.pk/ info@techmen.pk wmuggo@hotmail.com





How to test motorcycle CDI box, ignition coil
Mostly concerning CDI boxes and ignition coils... for more technical information feel free to message me, I'll send you some good info





Motorcycle Repair: How to Clean a Motorcycle Carburetor
Visit http://www.thesmallengineshop.net **Always follow the instructions in your repair manual when doing repair or maintenance work on a motorcycle. Manuals can be found at the dealer and online.** Almost all motorcycle carburetors are slide type carburetors. Slide carburetors can be further broken down to either mechanical or vacuum operated. The vacuum operated carburetors are called CV or constant velocity carburetors. The slides in a mechanical carburetor are operated by the throttle cable and the slides in a CV carburetor are operated by engine vacuum. Both type carburetors are very similar and are cleaned the same way. Although care must be taken with the rubber slide diagram in a CV carburetor. If you choose to clean a carburetor with carburetor cleaner from a can, or chemical cleaner in a dunk tank or gallon container, you must remove all rubber and plastic pieces on the carburetor, or you risk ruining the parts. A parts diagram for your carburetor will help you identify all the parts that make up the carburetor, so you can remove the plastic and rubber components before exposing the carburetor to chemical cleaner. Another method of cleaning a carburetor that doesn't involve toxic cleaners and is safe to use on all parts of the carburetor is a ultra sonic cleaner. Ultra sonic cleaners are usually marketed as jewelry cleaners, but they also work great for cleaning carburetors. Carburetors have passage ways in the body of the carburetor. Some passage ways are used as vents and some passages are used for the fuel circuits in the carburetor. A motorcycle carburetor basically has 3 circuits if you exclude the choke, and performance items like accelerator pumps. Every motorcycle carburetor has a idle circuit, intermediate circuit, and a high speed circuit. The idle circuit is responsible for delivering fuel from closed throttle to about 1/4 turn of the throttle. The intermediate circuit function from about 1/4 to 3/4 throttle opening, and the high speed circuit is responsible for delivering fuel from 3/4 to full throttle. The circuits are not limited to operating in this range, but they overlap and this helps the engine to transition from one circuit to another. Identifying these circuits in the carburetor can be helpful in cleaning the carburetor, but it isn't necessary. The main components of the idle circuit is the pilot jet and idle mixture screw. The main parts of the intermediate circuit is the needle jet and jet needle. The main parts of the high speed circuit is the main jet. After you have all the components in a carburetor disassembled and cleaned, its important to use compressed air to blow out all the passages of the carburetor. I can't stress enough how effective compressed air is in cleaning a carburetor. Sometimes passages in the carburetor don't get clean from whatever cleaning method you use, and compressed air can be used to blow out the obstruction. However, be careful not to blow out parts that should be in the carburetor. A parts diagram will help to avoid this problem. After all parts of the carburetor are cleaned and all passage ways and jets in the carburetor blown with compressed air, the carburetor can be reassembled and adjusted if necessary. Thanks for watching!





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