Cleaning the Float Chamber.
The float chamber is located at the bottom part of the carb.
Float chambers are found both types of carburetors mentioned.
Firstly remove the 2 or 3 small screws holding the "bowl" to the main
part of the carb (top photo). Expect a small amount of petrol (gasoline)
to leak from the bowl.
Using a clean rag, or a hard brush (It is possible to scrape
it with a screwdriver too, but take care when doing so) clean as much of
the inside of the bowl (left in lower photo). Making sure not to damage
the rubber seal. The brass tube you can see in the middle of the bowl itself
is an overflow pipe, make sure it is clear.
In the right side if the lower photo, you can see the float itself.
make take care that it does not get damaged.
Removal and cleaning of float
Carefully remove the small pin which holds the float in place. If the brass
section (some floats are made of 100% plastic) gets bent, or the float
is holed, the float will be have to be replaced.
Take care when pulling the float free, in some carbs are attached
to the jet, which pulls free along with the float.
To clean the float it's self, I usually use a small hard brush.
if you have the float type showed here hold the float you are cleaning.
Hold the other one, you'll probably bend the brass and put the float out
of alignment otherwise.
|Clean this jet with a small hard brush (an old toothbrush will do the
job), and make sure the little pin (beside my thumbnail) is able to return
into position when pressed. It's this stops the float chamber from over
filling, and the little pin always points down (I'm still laughing as I
found this one had been put in upside down, now wonder he was having getting
it running properly)
|The needle jet is very important, if this gets blocked, you'll get
no fuel to your cylinder. Check it by putting it into your mouth and blowing
(it tastes foul, but I've still to find a better way), if you can't blow
through it, clear it with a needle, making sure you keep the throttle fully
This done, it's time to replace the float and float back into
If you have more than carb to do, I suggest you do this one carb
at a time, or at least remember which float and jet came from which carb.
Cleaning & checking a diaphragm
|1. Undo and remove the screws from the top (there can be 2/3 or 4 depending
on the machine). Note the postion on the spring on th top, it fit's in
the hole on the center of the diaphragm.
2. Check the diaphagm to see if there are any holes in the rubber,
or if there is any pereshing. If you find any, replace the diaphragm.
|3. Lift the rubber and slider complete with needle and give wipe off
any dirt or grit. Keep the the rubber and slider up right as their are
small parts which can fall out and get lost.
|4. Note that this carb has a small o ringmake sure you don't
lose this. If you do the carb will not work properly, also make sure there
are no foreign objects blocking the pipe there.
|5 Replace the slider and diaphragm into position on the carb. Make
sure that the lip ont the rubber fits snuggly into the groove on the top
of the carb, I ususaly lift the slider up and let it drop into position
a few time, just to make sure it's sliding freely. now re position the
top and screw into place.
Cleaning & checking the Slider
Sorry, you'll have to wait until I have one to work on, but check top
right for more info.
To be done!