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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





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.





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.





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





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





Bicycle Engine Kit Carburettor Needle Setting Tips
How to install and check the cable, spring, barrell, needle and clip that dwell on the inside of the carburettor of your bicycle engine kit.





How to adjust the jets on motorcycle carburetors
This is a brief introduction to the fairly touchy process of re-jetting your carbs. The techniques discussed here are fairly universal to most carburated motorcycles, but not all, so your first step in performing carb tuning should be to consult your repair manual and online forums. Hopefully this video can demystify a lot of the process for you, so that you have the courage and interest to do this yourself. Let me know if you have any questions.





How to clean a carburetor in 15 minutes
These same instructions apply to most other slide throttle style carbs from Mikuni, Keihin, etc You can also take out the idle screw and spring while cleaning if you wish, but typically that isn't required.





How to clean motorcycle carburetors
Longtime viewers will see this as a refresher, but it does have some new tips not included in my previous carb videos





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.





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.





(5)- CARB SLOW JET ADJUST= EASY WAY
FOR OPTIMAL PERFORMANCE , THIS IS THE BEST, EASIEST UNDERSTOOD TECHNIQUE. Slow jets or air jets are very simple and have been around for decades and never changed.





Reassembling Keihin PWK Carburetor
Reassembling Keihin PWK carburetor





How to diagnose carburetor vacuum leaks on your motorcycle
This is a simple video demonstrating the best method to detect vacuum leaks around your carb boots. Vacuum leaks are a fairly common problem in older bikes, and luckily they can usually be remedied quickly and easily, the first step however is diagnosis. If your bike is running rough, won't rev up or has an irregular idle, before you take off the carbs and open them up, check for vacuum leaks. A vacuum leak occurs when too much air is introduced into the combustion chamber via a failure in one or more of the carburetor boots or other rubber mating surface. When too much air is sucked in, then the bike cannot combust the gasoline efficiently; there must be an optimal ratio. Therefore it is up to you to detect these leaks, and either plug them up or replace the carb boots. In this particular bike, the engine was running VERY lean. Not only did we have vacuum leaks, but the baffles were taken out of the engine, and the previous owner had removed the air filter and neglected to install a new one. This is not only dangerous by allowing foreign material to enter the engine, but it also makes the engine run much hotter, as lean explosions create more heat than regular ones (think about blowing on a fire in your fire place: more air, hotter fire). This can be detrimental to a variety of parts in the engine, and it is a good thing we didn't ride this bike around too much before finding the problem. If anyone has any questions as to why this is important or how to find/repair these leaks, leave a comment and I will respond. Thank you





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





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