What should the compression be on a new model Stihl ms 261. I recently purchased a new ms 261 non M-tronic 18" .325 bar. I LOVE IT light weight,plenty power. My last saw was a husqvarna 545 same size bar very light with lots of power when it ran. Unfortunately it spent most of its life at the husky shop. Darn auto tune saw would not run when it was hot.