Husky 61 top end damage.

[bmp01]

8 minutes ago, Stubby said:

Is it the pin that stops the piston ring rotating in the ring groove ? 

It’s there, present and correct. 
(And finally he uses the quote function to reply to the suggestion 🙄 )

[Stubby]

12 minutes ago, bmp01 said:

It’s there, present and correct. 
(And finally he uses the quote function to reply to the suggestion 🙄 )

You say it had a cheap Chinese spark plug . Was it too long a reach and the bottom electrode snapped off ? ( he said using the quote tab 😀 )

[Oldfeller]

9 minutes ago, Stubby said:

You say it had a cheap Chinese spark plug . Was it too long a reach and the bottom electrode snapped off ? ( he said using the quote tab 😀 )

good shout, that main vertical groove looks as if something shaved a chunk out the piston, surprised it never took the ring out, but the resultant debris would give results similar to this.

[bmp01]

8 minutes ago, Oldfeller said:

it's possible it's not all of the original parts, as you say it looks like it was thrown loosely back together.

I had an old pioneer here that looks like it was ran on a mixture of fuel and gravel, that too showed little evidence of bottom end damage too.

the black areas of the crank could be the heat treatment from the factory, or maybe a sign of severe overheating, which could have contributed to the resultant wreck.

I would completely dismantle it and assess from there. if you got it cheap it could be made into a decent saw again with a little tlc and a few parts.

Good thinking and apologies for not elaborating - who ever investigated it stopped at the filter. Carb wasn’t removed nor was the cylinder. Plenty of undisturbed sawdust and oil there.
That’s the right course of action I’m sure. It’s good enough to warrant getting back to full health.

[bmp01]

14 minutes ago, Stubby said:

You say it had a cheap Chinese spark plug . Was it too long a reach and the bottom electrode snapped off ? ( he said using the quote tab 😀 )

New plug is Chinese and healthy, I think it’s the correct spec al-be-it Chinese. But the fact it’s new might be a clue…. Those bits could be the curved electrode of a plug. If any of the dents in the piston or cylinder were curved in shape that would have been conclusive. But the long dents are straight. 
Also worth mentioning some of the dents are carboned over.

 

[bmp01]

16 minutes ago, Oldfeller said:

good shout, that main vertical groove looks as if something shaved a chunk out the piston, surprised it never took the ring out, but the resultant debris would give results similar to this.

Ring got forced back into the groove about 1/2 mm, I was surprised there was enough depth in the groove for that to happen.