Weather is 30-50 when I'm cutting and I'm trying to run 40:1, 93 only. The engine needs a precise mixture of air and fuel to run efficiently, and when the ratio is off, it can bog down. Why does the ECHO chainsaw bog down when cutting? A couple of the small holes were plugged with what seemed like excessive oil, but once I blew on it it was clear. */ Confirm for water and debris in your fuel tank. Ok I got it posted. Although Richard does focus on other home improvement tools, his focus remains on cutting fallen trees or maintaining his backyard via chainsaw tools. Just not sure what I am doing. Inspect the spark plug and replace it if necessary. When a screw (e.g., anL screw) is tightened, the fuel flow to the carburetor is restricted, causing the mixture to be lean. The engine and its associated delivery system need to be airtight to maintain adequate temperature and pressure. When the L or idle screws are not properly set, the idle RPMs fall too low, causing the engine to stalland eventually stop. Unless you are running an electric chainsaw (which is a totally different beast), your chainsaws motor is a combustion system that relies on a proper ratio of gas, oil, and air. on Chainsaws, Started by rapserv I just worked on my grandpa's ms 192t. Anyone have any suggestions? Please loginor register. Sounds like a blocked passage somewhere to me. It idles fine but after you rev it up it looses power. If your Stihl chain saw purrs like a cheetah when it's idling but stalls when you actually try to do some work with it, it could indicate the carburetor isn't adjusted properly. You cannot mix oil and gas directly in your chainsaws fuel tank and will need an empty, leak-proof fuel container that is just slightly larger than the volume of oil and gas being mixed. I. Once youve made the adjustments, make sure to monitor the performance of your saw over the next few days and readjust if necessary. What causes a chainsaw to bog down when accelerating?