Stihl 026 pro carb

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I just fixed my 028 that way. I pulled the carb and the rubber and gaskets looked fine, the only thing dirty the screen. I replaced the screen and saved the rest of the kit for the future.
And I fixed a vintage 011 AV and an MS650 that way two weeks ago. You run into this after eight to ten years of use with many older saws.
 
All that was cleaned. I even set the metering lever a little high. I wrong its just a old 26 no decomp, but the new carb shines. who got that rubber grommet wiyh two holes
 
The boots tear in the crease the only way to find it is by bending the boot. Like I said easy thing to do is start the saw put the bar tip on the log and push down. Then find something solid pull up. If it idles up the boot is the issue.
I know the theard is old, but I have that problem with my 026, I changed intake pipe, impulse wire, clean carb, new piston rings, new crankshaft seals, new air filter from ms260 and add compensation plate for carb wt-194. But hole time when I push bar to the wood saw reduces rpm or died. When I blocked bar from up and pull saw rpm rise up
 
Not sure you should throw away that old carb. This sounds like the old carb's filter screen is clogged up. A simple removal and cleaning of that screen may have solved your problem.
OP mentioned original carb was fixed high speed. Those belong in the scrap bin IMO. I always replace those with WT-194 even on the pro models I just transfer the snorkel.
 

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