Chainsaw Repair

The carb arrived ready to bolt on other than needing to swap over the throttle stop screw.  The threads between screw and casting were not tight enough to ensure the setting would stay put so for now I used a drop of blue Locktite on the threads.  There is a hollow "hole" cast above the threaded hole that I presume is used for squirting a liquid sealant (paint drop, glue, whatever) to lock the screw in place.

It started right up cold but died for a while with the adjustments I guessed at.  I got it to operating temp and set the screws and all is good now.  It even has better top end and better throttle response than ever before.  Like I said, the original carb was always junk but the last time I checked at the local Stihl dealer years ago it would have cost >$150 so I kept putting the project off.  If anyone else is hesitant to use a "Proven Part" carb which looks different than his original Zama but matches the application, I'd say go for it.  Mine had the area of the lower cover sanded off where "Stihl" had been cast so I'm guessing this is the same carb that Stihl would sell over the counter these days, only obsfucated for exclusivity and warranty reasons.

Final note on the old carb, there was an essentially unfixable problem in the plastic "vent" housing that caused an air leak in the primer and feed circuit as well as it would cause gas to puke out into the air cleaner housing.  It was a mess.

Thanks for the great help on this matter!

A couple pics of the new carb, hopefully the ink and casting numbers are legible.