Adjusting an MS260

[DLMaine01]

I am having trouble adjusting the carb on my 260. I replaced the carburetor with an aftermarket one. It starts on choke fine and will idle ok but will not spool up enough to turn the chain much. I put the carb to factory settings but any other adjustments I do does not seem to help much. I replaced the carb due to age and general lower performance issues. It is a cheap aftermarket carb but I know some others that have worked just fine.
Any advice appreciated! 

[DelawhereJoe]

Did you replace the fuel lines, there could be a crack in it and that crack is sucking in air.

[DLMaine01]

Yes, replaced fuel line with a genuine Stihl one and the impulse line as well.

[Woodcutter_Mo]

 I used a cheap aftermarket carb on my 024 which worked good for a while then started acting up. I opened up the carb and found some fine metal dust inside, I assume from the manufacturing process, that I believe to be the issue. Maybe open it up and see. 

[millwright]

Also make sure the muffler screen is open, if it is plugged it will idle but not rev up.

[DLMaine01]

Thanks for the replies. I did check the muffler screen as I had read that could be a problem in some of my research. 
I was able to find a step by step for adjusting the saw which I will try this weekend. If that is a no go I will open up the carb and clean.
Thanks again.

[Pulphook]

Worth the extra $$$ to refit with the Stihl carb for the 260. Aftermarket copies don't have the same tolerances; often China.
Not worth the hastle, since most of the effort is the install.
We've all been there.

[teakwood]

Aftermarket carb works fine. i did two 260s with AM chinese carbs, around 12-15$. they work well.  We have members here that have used dozens of AM carbs on their rebuilds and they haven't complained 

[Pulphook]

I'm complaining.....2X.

[Mad Professor]

Fatten up low (CCW) a bit

[ZeroJunk]

Could also be that your lower performance issues weren't the carb to start with.

[DLMaine01]

Success! Used the instructions I found online and it is running fine now. I bought the saw used so I never had a manual for it. Was able to cut for a bit today and all was good. I also thought the aftermarket carb was a risk, hit or miss, but this one is doing OK at the moment.
I also have a MS290 and these 2 saws make a good team.