I did a quick search for an OEM Stihl top end kit for the MS660 and see Bailey's has them for about $440!
http://www.baileysonline.com/Chains...mbly-54mm-for-066-MS-650-MS-660-Chainsaws.axd
A quality aftermarket top end kit from Meteor is like $135.
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/183035244621
By gosh you better make sure they put an OEM cylinder and piston in that saw for $500! If they use aftermarket parts then they are as worthless as **** balls on a cows tail.
http://www.baileysonline.com/Chains...mbly-54mm-for-066-MS-650-MS-660-Chainsaws.axd
A quality aftermarket top end kit from Meteor is like $135.
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/183035244621
By gosh you better make sure they put an OEM cylinder and piston in that saw for $500! If they use aftermarket parts then they are as worthless as **** balls on a cows tail.