For some reason, i can't reply to that thread, but here's my response. first off guys......Echo doesn't manufacture the carbs. They are made primarily by walbro and zama, which are the same carbs on redmax, stihl and every other piece of 2 stroke equipment out there. To say , we don't use echo because of their carb problems is a joke, hate to tell you. To answer your question , from a dealer, yes, we have seen quite a few issues with carbs this year on the 25cc power heads. Srm260s, and Pas260's. We don't sell the srm260t, but same powerhead. What we have found is that these rotarty valve carbs DO HAVE ADJUSTMENT SCREWS. The are hidden under a plasic cover on the back of the carb, recessed down in the body. The big complaint we see is it bogs really bad when cold, and or it tends to bog and loose power when tipped a certain way. You need a 3/32 drill bit. Use your hand and stick the bit down in the hole and catch the plug with the bit , and keep working till you catch it enough to pull it out. Start the trimmer, let it run for about 30 seconds at wot. Turn the screw in till it leans out and starts to scream and run smooth, then fatten it up just a tad. We have gone nuts this year with these issues, till we noticed the product comming in toward the end of the season, had the screws exposed, and there was no caps. Again, not echo's problem, walbro's issue. Has been addressed. All the carb's we've adjusted solved the problem and never reoccured. The epa and carb certification board wants us dealers to tell you you need a new carb, when they can be fixed. Tampering with these adjustment carries fines according to the manufacturer. Upwards of 25k per unit on your trailor......or in my shop in this case, that has had the adjustment screws tampered with.