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)
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?
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
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
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.
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 Tune Up A Royal Enfield Bullet Motorcycle - Ignition Timing And Point Gap
Here's how to tune up a Royal Enfield Bullet Motorcycle. I go over the
static method of setting the point gap and ignition timing. This is the
tune-up procedure recommended by the Royal Enfield company. To set the
point gap, remove the points cover and turn the engine around until the
points are open their widest. Then set them to .40 mm, making sure the
feeler gauge goes in and out with a little bit of resistance. Setting the
timing is outlined in the video. I used the official Royal Enfield tool to
measure the height of the piston, and then set it so that the points close
at .8 mm before top dead center. This is a good time to examine your spark
plug and clean or replace it. Once you've done this tune up to your Royal
Enfield Bullet, take your Royal Enfield Bullet Motorcycle for a ride to
check for any loss of power or pinging from the engine. The engine will
ping if the ignition is too advanced, so if you hear a ping, retard it.
See my Royal Enfield Bullet 500 at http://www.hoohoohoblin.com/
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.
How to change piston / top end rebuild 2002-2007 Honda Cr 250
Join the FREZ PRODUCTIONS Facebook site!
I`ve got many nice comments for making the "Honda Cr 125 piston / top end
rebuild" movie. In this movie, I show in good detail how to chance the
piston on your two stroke Honda Cr 125.
A similar movie for the Honda Cr250 would be nice, and that's what I have
Hope you like it!
The bike used in this movie is a 2007 Honda Cr250.
Always use the right manual for your bike! The 2002-2007 Honda Cr250 bikes
are very much alike but there are some changes. That's why the right manual
for your year is important.