Judging condition of top end?

Caber rings are suppose to be better.

 

Rolloc scotchbrite has absolutely no place in a motor. I have rebuilt more motors because of rolloc disks, and quite a few engine manufactures have countless TSB's on not using them on an engine.

 

Here's the last one. Done in October, 29,000 miles, rolloc cleaned the timing cover about 5,000 miles earlier.
Top pic is going together.

 

Correct would be to measure out of round and cylinder taper. But you would need a spec of what the bore is supposed to be first to compare what you are measuring. You can cleanup aluminum transfer with acid.

The piston should be replaced unless you do not care about the results or have high expectations for this saw.

I prefer to use a deglazing or sizing hone depending on what the condition of the cylinder. Here is a good link with some basic info and video on the process http://www.enginehones.com/technical.html

Someone people just sand or use whatever is available to clean a cylinder up and I guess it works but key is to clean that jug up after any abrasives so it doesnt work its way into any part of the bearings or rotating assembly.

 

+1 on the rolloc

They can be good if used carefully.

I rebuilt a subaru engine last year after it was at the dealer, the tech that worked on it managed create .010" low spots on the deck surface created an antifreeze leak between the head and headgasket and leaked antifreeze internally and wiped up the bottom end on the engine.

Dealership blamed it on the customer for "lack of an oil change" thought I was going to be caught in a quagmire there.

 

Lots of ways to tackle this (or not)...lots of opinions. I'm not one to mention other sites on here, but nearly all other chainsaw forums have beaten this topic to death with a couple overall conclusions. Good luck!

 

Your turn

 

Where is the smiley 'stiring the pot' , 'Gas on the fire'...

 

Hahahahahaha!!!!!!

Ditch that piston...
From a performance stand point...
Seriously..
Ditch it...

 

I thought maybe i was nuts thinking to myself there is no way id put that piston back in a saw

 

The late model 350's ran so good, the Swedish mother ship had to do something to broaden the gap between it and the 353...
Enter that stupid dished piston...

Now we know...
"The rest of the story"

 

Good post, thanks.

 

I appreciate all the different opinions about what is and isn't appropriate here. MM's oil film reasoning, combined with the prospect of a performance gain with a flat-top piston, is enough to convince me. I'm not sure whether I'll ultimately sell this one or my 55 Rancher, so it makes sense on a number of levels to do it right.