I have an excellent running used MS660 chainsaw powerhead that I have put together with some used OEM Stihl parts, some new OEM Stihl parts and then with many new aftermarket parts including a new Meteor high quality motor made in Italy. No other aftermarket motors compare with these. Meteor pistons come stock with the high quality Caber rings. Very strong compression, in the 170lb range. The Nikisil cylinder coating is top notch, very hard, not like cheap kits that wear out in no time. I had one of the Meteor motors on a local fallers saw and he ran it for 6 months with no problems, that is 6 months of 6 hours a day cutting.

Some other parts are the new NGK spark plug and new Oregon drum and 3/8th by 7 tooth Oregon drive sprocket. New fully adjustable carburetor. 

All works as it should, I ran the new motor for 30 min to help break it in. Fires up in a couple pulls, idles nice and lots of power with 92 cc's and near 7hp. Good working chainbrake for safety, oils good and decompression button for easier starting.

Ready to go cut some firewood. I recommend 40 to 1 oil mix, keep your chains super sharp. 

I have built over several hundred of these chainsaw unlike some of the saw builders putting up saws on ebay with parts put on backwards. I have also sold 1000's of used saws and 1000's of parts.

No bar or chain with this, but I have some to sell if  you are interested, just ask.

Thanks for looking.

Dave.