I have a stihl 041 chainsaw that starts OK but when it gets warmed up will not run full throttle. It runs very well at all speeds until it gets warm.

Stihl instruction manuals are available from the following website:

Stihl Instructions - Stihl Manuals - Stihl Guides

Good Luck

Check your muffler and exhaust ports.

I have an 041 stihl and after running a short amount of time the chain jams up. The clutch is free but the sprokett is seized up. Could it be something wrong with the oil pump? It oils well. Thanks