please help me figure out what to do with my ms660.

[scallywag]

Your piston is 100% serviceable, IMHO.

Even though it appears to be shedding material from the window ?......What's the price of a new 660 piston kit in the US these days?

[Edit] To answer my own question......I see AS member 'SawSalvage' has 660 pistons for $56-.

 

[Marshy]

Im not a big fan of chasing threads in aluminum, especially with a cutting tap (big no-no). You could try it but it might make the thread engagement lose and cause more problems later. Time-sert, Keensert or Helicoil thread repair would be the preference, in that order.

JMO but I don't believe part of the thread would cause that type of damage as the thread is the same type of material as the piston and cylinder. Wht ever did that was harder than these two. It could be a piece of cage material from a bearing or other foreign particle.

 

[jr27236]

I second the motion. Lol

 

[blsnelling]

I 3rd it