Sudden loss of compression

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Exhaust port on bottom picture look's like it has been opened up some..



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I'm probably the minority here... but I sure woudn't want an aftermarket P&C kit on the saw that I bought with a supposedly good oem set... I've seen the nikersil/chrome/whatever peel on the Chinese (or Taiwan, who knows) cylinders, and the pistons look rough to me. But it's your saw...

And maybe I'm seeing things, but that saw look repainted to me... or almost new...
I'd guess that saw has been "rebuilt".. the exhaust port is WAY too clean...

Seller said the guy who traded it in had just replaced the c/p.... which is making me think there was an underlying problem already. I'm leaning toward just asking for a refund and starting over. Hard to do, though, because I was already starting to bond. ;)
 
Seller said the guy who traded it in had just replaced the c/p.... which is making me think there was an underlying problem already. I'm leaning toward just asking for a refund and starting over. Hard to do, though, because I was already starting to bond. ;)

your leaning the right way.
 
Check and see if it has a paper or metal cylinder gasket...

Yep, I'd start over (too many unknowns for a 535+freight saw), but you'll likely eat the freight.
 
I too would lean towards a refund and start over with another saw.
that p/c is tore up pretty bad,066 don't just do that,there is an underlying problem there.
if the piston looks like that,who knows what stress the bottom end has endured.
 
An air leak sounds very likely - crank seals or a torn intake boot. If you have to pay someone to do the work, and for the crank seals, you will be awful close to the price of a new saw. Add in the price of a p/c kit (I know you said you don't have to buy it) and you could buy a new 660. I think you are doing the right thing asking for a full refund. If you are going to get a free piston/cylinder replacement, you can likely salvage the cylinder that is on the saw now...but like I said, you will still have to fork out to make the other repairs.

If you guys do a little detective work, you can find out pretty easy who unloaded the saw. Check the link Trimmmed posted, and then check the saw classifieds on this site...the same saw was posted here.

Things should all work out for both parties involved - at least I hope they do. I run at aleast 2 tanks through all the saws I buy/sell to make sure things check out A-OK. I then set the carb to the factory settings as I live at 5000' ASL.
 
Lake. I lightened up the ebay pic, lemme try the pics again. There certainly are casting similarities,(as I would expect) what I noticed was the difference in the dirt on the muffler flange, maybe they are the same??


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I'm pretty sure they are the same... even though I'd like them not to be so we could have a real witch hunt!:D
 
I think they are the same, too.

I have fixed worse with no problems. Saved the cylinder this piston came out of.

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I feel for you. Ebay is a craps shoot for saws. I would break balls, and get a full refund. You don't need to spend $550 and get a basket case. From reading the thread and resident experts opinions, there seems to have been a preexisting problem with the saw. Get your hard earned $ back and start over.
 
Thanks, everybody, for all the input.

Oh, and Lakeside -- I'll skip the witch hunt in favor of a working saw.
:rockn:
 
Lake And Treeslinger nailed it

"all the way CCW" on H likely means the prior owner has compensated for an airleak.

"all the way CC" on L??? Hmmm... shouldn't start unless it has flooding carb?

I suspect the prior owner has been in the carb and messed it up.


Altitude won't make a big difference unless we're talking 4000-5000 feet.
The cyl may clean up with a hone, Then perhaps a fresh piston, carb kit and find the leak,,,, and you should be in business,,,,, I hate freakin Ebay sharks'
Your best bet will be to document everything and not do anything to it repair wise untill you resolve with the seller, take a lesson learned the hard way from B snelling,,,,, IF you decide to keep it and fix it we will help you through it :mad:
 
The cyl may clean up with a hone, Then perhaps a fresh piston, carb kit and find the leak,,,, and you should be in business,,,,, I hate freakin Ebay sharks'
Your best bet will be to document everything and not do anything to it repair wise untill you resolve with the seller, take a lesson learned the hard way from B snelling,,,,, IF you decide to keep it and fix it we will help you through it :mad:

At this point, I'm nott hinking of the seller as a shark, but I did just email him saying I want to return the saw for a refund. As a couple of people have pointed out, the problem might be pretty involved, and it's an expensive saw to practice on. My priority right now is to have a usable milling saw ASAP. Later, I'd like to find something in the 026/034/044 range to play sawtech on. ;)
 
If your'e going to mill... don't use an 066 with standard (ie - optimized for crosscut) carb settings... the saw needs detuning (say 11.5K WOT) and preferably a decent synthetic mix at 40:1... and try to find one with an OEM piston/cylinder ...

I mill with an 066... and it's rough on them in big wood (24 inches is big wood when milling).
 
At this point, I'm nott hinking of the seller as a shark, but I did just email him saying I want to return the saw for a refund. As a couple of people have pointed out, the problem might be pretty involved, and it's an expensive saw to practice on. My priority right now is to have a usable milling saw ASAP. Later, I'd like to find something in the 026/034/044 range to play sawtech on. ;)


Welp I took a closer look at those pics and that saw looks as though its been painted and looking at the cylinder , the starter housing, the top shoud and the air filter cover I'd say that was a saw pieced together from various parts from various saws. Is the flywheel on that saw metal or is it poly? That would be a good indicator of how old that saw is and whether its a piece together saw. Also does the carb have the little red limter caps on the adjusting screws? That with a metal flywheel would indicate it is a probly a pieced together saw. If it is in fact a saw made up from various parts off other saws scanning many different years do nothing, simply get your money back. I don't think the ad said it was what it appears to be, a parts saw with a paint job that runs.
 
In the pic you can see over spray on the AV mounts. They should
be black not white.
 
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