Stihl 024 and Husk 245(?) both with same issue.

[organic guy]

2 hours ago, adw said:

It would be interesting to see the metering diaphragm, if this has hardened it will lose convolution so will not function properly against the metering lever, I still think it would be good just to richen the H screw just to see if they then pick up, then strip the carb to investigate why they have leaned off.

Gave the H screw on the Husky 10 mins and she certainly runs happier in the workshop. Will try in anger tomorrow.

Edited November 6, 2021 by organic guy
addition

[organic guy]

Update!

Husky 245 running after opening up the H screw, but not sounding brilliant, I guess I need to fine tune it.

Stihl would not improve with tinkering with screws, or cleaning carb, so replaced all carb diaphrams etc and would fire but not run. Reset screws to factory settings and she sounds happy, so just need to find time to try in anger.

Thanks for your help.