That blue one is trash. The tan was the better one and the black rubber would be a good choice if it's never gonna see ethanol in its fuel. Likely there wasn't anything wrong with the tan one.
I don't see the tan one in the photo. The one near the Philips screwdriver handle is one possibility as is the blue one as they both have the large pump area intact but are obviously different.
Just rebuilt a WT series Walbro on a Stihl 026. The saw starts and idles great at one turn out on the low jet. When I give it throttle it runs way too lean, two turns out on the high jet before it will stay running, and with the high screw a few more turns out its still really lean. I can't get it to richen up at all. I started thinking air leak, despite it idling well. I swapped an identical carb from my other 026 on the problem saw, and it runs as perfect as you could hope for.
What did I do to mess up this
I read the entire post. It was very informative and a great source for learning. Since you invested so much time and effort, wouldn’t a vacuum/pressure gauge have helped with the troubleshooting?Well, I got my new Walbro carb in the mail yesterday and got it installed. Saw fired right up, and ran well at all speeds at factory 1-turn out on L and H screws. I did a little fine tuning, very happy with it now. Guess I will box up the old problem carb, and maybe work on it some rainy day I am very bored. For now I'm happy to get the saw running right again. Thanks everyone for your help.