(quoted from post at 10:15:04 09/19/12) Well........probably best if I snap a picture and post it this evening. Not sure the exact model of MS carb it is but I'll try to explain it as best I can. Carb mounted on right side of engine, just forward of the throttle linkage (where throttle the shaft passes through the throat of the carb) this brass screw/jet/needle goes in at an angle pointing to the left rear of the tractor.
I applied what I "assumed" to be a reasonable amount of force........then probably a little more for good measure and snap! So in my infinite wisdom, and because this has worked for me many times in the past on non-brass screws, bolts etc. I got my easy outs and proceeded to drill. Well the smallest easy out I had just stripped out the brass so I proceeded to the next size which gripped well but I still couldn't get it to budge. So I drilled it out a little more and tried to knock the sides of the screw in but in hindsight that was probably a very bad thing to do. After I looked at the new one that comes with the rebuild kit I realized how far into the carb it actually goes. So now I'm not too sure just what to do. I don't think I have damaged the threads (yet) on the carb body but I still have to find some way to remove the remainder of the screw/jet/needle.
I have it soaking in a can of carb cleaner right now maybe that will help. Funny thing is, everything else came out just fine, which is normally not how it goes with other old carbs I've worked on so I just assumed this screw would be no different.
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Inno;
SO....now that I know for sure what is broken....I'll tell you to keep chuging away at it with the drills, and being very careful not to mess up the threds...
That is the Idle/air/fuel mixture screw
sizing...10-32UNF
Length of the threds 1/2in
length of the tip ....(pointy end) 1/2in
I understand that you like to use an esy-out, BUT JMHO, this job is going to be a drill, and pick job.
From what you have said, I'm thinking that you still have at least 3/4in. of the screw, left inside the hole!!!??
Start with a 9/64 drill to make a pilot hole(Centering), then step up to 5/32,...then up to the max size of 11/64!!!!!! When using the 11/64 in the hole, make sure NOT to wobble the bit in any way......(If the threds are stripped out,....you will never get the tap to make the right size threds!!)
After removing the screw/debrie from the hole, using a 10-32 unf tap to replentish the threds.
If all goes well....then wash out the hole/threds, with a lite oil and compessed air.......then...hand install the new screw....then wash out the hole,again, and if ya did it right.....ya just saved the carb......IF NOT....then the carb throttle body,
is pretty much useless, with 0ut an Idle air screw!!!!!!
Left handed drill bits are avail. form Harbor Frieght, and work lots better than righthanded drill bits, for this kind of work........(Just a thought)
Hope all goes well for you!!! NEED MORE HELP.....Post back!!!
Gary :wink: [/i:d6a124e55f][/b:d6a124e55f]
