It turns over fine and has good compression, the spark seems a little weak, but I don't want to mess with it anymore. It might be an easy fix, or you might just have lots of good parts. I did replace the fuel tank several years ago with a new OEM fuel tank as shown. It's a heavy saw that used to have lots of power. The item "STIHL 066 CHAINSAW AS IS FOR PARTS OR REPAIR POWERHEAD ONLY" is in sale since Tuesday, October 30, 2018.
This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Outdoor Power Equipment\Chainsaws". The seller is "3angelgirls" and is located in Wamego, Kansas. This item can be shipped to United States.