Certainly appreciated all those that gave advice and provided valuable info. Bought this 066 from ebay with low compression. Piston scored on exhaust side. Disassembled entire saw and cleaned it all up. Despite being up all night at the firehouse, was able to get it all together today. Using a mini screwdriver on the rings worked very well. Pressure and vac tested good. Popped on the first pull and ran on the third. Have been thru several heat/cool cycles with it today. Runs great, can't wait for it to get broke in. Hopefully no rain tomorrow so i can get it in some wood. Idling at 2900 and set the high at 13550. Put a 24" bar on it that i had for my ms440. Thanks again. 
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