I learned last few years to use my decomps on the bigger saws. My shoulders cant take it anymore.
I laughed when a logger was buying my 385xp and he went to start it without decomp. I was like I told ya it had good psi. ;)
Back 10-12 years ago my 066 had no decomp, no base gasket and...
IMO find out why it scored in the first place. Seals, carb tune, decomp etc etc to make it go lean with air leak or whatever.
Pull top and see how bad is cylinder. If OEM cylinder lets see how bad it is. Most can be cleaned up and then use a OEM or Meteor piston kit. JMO
Then you have maybe...
OEM has went down on price. This is still pretty high as it is ebay at about $270 shipped. https://www.ebay.com/itm/STIHL-CHAINSAW-066-MS660-PISTON-AND-CYLINDER-NEW-OEM-STIHL-54MM-1122-020-1209-/232631870287?_trksid=p2385738.m4383.l4275.c10
I just dont like aftermarket on pricey saws.
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