Motorcycle Repair: How to Clean a Motorcycle Carburetor
**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
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
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
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!
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
Slicks Garage "World's Fastest Lawnmower"!
Here is Slick, the owner of Slicks Garage in Palmetto,FL., doing a burnout
on his "World's Fastest Lawnmower" during the garage's monthly event called
"First Fridays on Fifth". Held the 1st Friday of each month at Slicks
Garage, 923 5th St. W. Palmetto,FL.. This was from August 2010. And by the
way, for all of you asshhats who sent me emails stating "Well, Johnny
So-and-So has the record for the world's fastest lawn mower! This ain't the
world's fastest lawn mower!"......GET OVER IT!! I don't care WHO has the
"record". IT WAS JUST A TITLE. Good grief people, get over yourselves.
How to sync carbs on a motorcycle
This video demonstrates the procedure to synchronize a carburetor on a 1977
Honda CB550. It is really important, especially for bikes of this vintage,
to synchronize your carbs at the beginning of every riding season or after
any repair or adjustment to the carbs. This bike still needs some work to
be road ready, but it has a lot of potential and is super cafe racer cool.
If you are attempting to do this procedure yourself and have any questions
before you start, feel free to let me know. That's the good thing about
Youtube, FREE INFORMATION FOR ALL!!!!!
EDIT: Here are a few edits I would like to make to this video after
watching it a couple of times.
1. Make sure your carb synch comes after everything else in a normal tune
up. This includes Valve clearances, cam chain tension, spark plug
gap/cleaning, point gap, ignition timing, air filter cleaning/replacement,
and all the air bleed screw settings should be checked.
2. Engine speed for a carb synch should be around 1500rpms if possible.
3. The adjuster screw lockdown nuts should always be re-tightened after
adjustment (I forgot to show it)
ryobi weed wacker repair, string trimmer, wont start SIMPLE FIX
Most of the time when a 2 stroke string trimmer wont start it is the fuel
lines. They can become brittle with age and will crack in spots that you
cant see. They can crack in such a way as to not leak fuel but will suck
air when engine is running. If your furl lines are discolored and the
trimmer is not running correctly or at all change the lines first.