Stihl 084 advice wanted

[Gravely009]

Evening everyone!
I recently picked up an 084 and just pulled the muffler to take a little looksie tonight. I wanna start by saying that while I’m pretty alright with all the external stuff I don’t have a whole lot of experience messing with pistons and cylinders (I’ve only done 3 or 4 and always with parts that didn’t need to be cleaned up before installation) and I’m looking for a little sage wisdom. Compression seems alright but I haven’t had a chance to put a gauge on it yet and I’ve never worked on a saw this big.. so really I’m just guessing but it’s a bear to pull over. I’ve attached a few photos of what I could see through the exhaust port as well as a few of the plug. This needs to be pulled apart and cleaned up, correct? New rings at a bare minimum? Any advice would be greatly appreciated! Thanks in advance

 

[Gravely009]

 

[Woodslasher]

That looks a little carboned up to me, I'd pull the jug and clean the exhaust port, cylinder roof, and the top of the piston, clean any carbon streaks off of the cylinder walls and piston, install new rings while you're in there, and re-assemble/run it.

 

[Dennisthemenace]

View attachment 913881View attachment 913882

Agree with Woodslasher, also check muffler and delete screen if any , fit a carb kit, Max flow filter and a D handle and you are now the proud owner of one of the last of the real good big saws.
Many old loggers here (Oz) prefer them to the 088 /880

 

[drf255]

IDK, that’s looks pretty damn normal and good to me. I‘d personally just run it. Use red armor oil at 32:1. You’d be surprised what it will clean up in a motor.

 

[J D]

Agreed, unless compression was low I'd give it a tune & run it.

 

[Gord404]

Picked up one myself last week and physically in nice shape, it's got issues (scored piston) so will pull it down when I have a chance , quite the saw
Got 2 more customer saws that he wants me to make 1 out of the 2 and the addition of a hand oiler assist is something you don't see very often anymore

 

[Gravely009]

Picked up one myself last week and physically in nice shape, it's got issues (scored piston) so will pull it down when I have a chance , quite the sawView attachment 913992View attachment 913993
Got 2 more customer saws that he wants me to make 1 out of the 2 and the addition of a hand oiler assist is something you don't see very often anymore

Ohhh that’s clean outside

 

[Gravely009]

Agreed, unless compression was low I'd give it a tune & run it.

Ill give her a little shot of gas and see if it’ll run

 

[Gord404]

Ohhh that’s clean outside

Ya really was surprised, and having the well known disorder of not having enough saws well i'm in the process of cleaning up my shop and sea can to make a more organized disaster I just couldn't help myself - again

 

[sean donato]

Nothing wrong with that saw. They are a bear to pull over. Make sure the compression release is working. Had my knuckles smacked more then once by one.

 

[Woodslasher]

Maybe I'm wrong, but I thought the tiny vertical marks on the piston were being caused by little bits of carbon breaking loose and wedging themselves between the piston and cylinder.

 

[Andyshine77]

Looks normal, in fact really good.

 

[Gravely009]

Thanks fellas, I’m gonna avoid pulling it apart and see if it’ll run. I appreciate all the advice!

 

[Gravely009]

Thanks fellas, I’m gonna avoid pulling it apart and see if it’ll run. I appreciate all the advice!

And with that reply I officially turned into a full blown arboristsite MEMBER not just a lowly lurker