Author Topic: Orifice chambers  (Read 252 times)

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Offline shoesnsocks

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Orifice chambers
« on: March 02, 2017, 11:30:25 pm »
I'm rebuilding the carb on my CS-302s. I've never done a complete carb rebuild before and probably don't have to but this is partly just for practice. I want to open up the orifice chambers and make sure they're clean and I just wanted to make sure that I've got the right idea on how to do that. Do I just punch a little hole in the cap and pry it out?

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Offline Cut4fun .

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Re: Orifice chambers
« Reply #1 on: March 03, 2017, 01:27:25 pm »
Good little guide on carb fixes and trouble shooting etc. Also tells and shows welch plug removal. page 8

Under the extreme conditions of a clogged idle port
and channel, it may be necessary to remove the
welch plug.  Do this operation very carefully.  If the
carburetor is equipped with the priming pump, do
not attempt to remove the welch plug unless you
are certain the check valve in the idle chamber is
Use a small 2/32 to 3/32 inch diameter sharp
pointed punch to pierce the welch plug.
Just below the welch plug there is a thin casting wall where the idle and secondary holes are located. 
Punching through this area will ruin the carburetor body casting.  Let the punch just pierce the welch plug,
then carefully pry the welch plug out of the body casting.
If the carburetor is equipped with the plastic filling in the idle chamber, it will be unusable when the welch
plug is removed.  So, replace the plastic filling.
Note:  It is often un-necessary to remove the welch plug.  Test for plugged progression holes by spraying
carb cleaner into the L needle hole.  If cleaner sprays out the progression holes there is no need to remove
the welch plug.
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