Light scoring

[merc_man]

I pulled the muffler on my 066 to see how the piston and cylonder looked after ther first tank and half and noticed a little bitnof lite scoring in just one spot. My guess is its from the carbon maybe? I shiuld have cleaed up that port befor input it togeather. Lesson learned.
Question is should i be concerned and pull the jug and clean up the port? It dont have major build up. I wonder if i maybe knocked a small peace loose when i cleaned up the cylinder.

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[Wonkydonkey]

I,m thinking the same as you, got a bit of carbon from the exhaust sucked back in or it just fell off and did what it did.

I’d clean up the exhaust sooner rather than later. It be up to you if you removed the cylinder, but I would just for peace of mind so I could check the rest.

 

[merc_man]

I will pull it just for peace of mind. And then can clean that port good too.

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[Basher]

I think your carb tune is running very rich, that`s a lot of carbon in and around the port. What does the muffler look like?

 

[Canadian farm boy]

Looks to me like a carbon smear on the piston. It likely won’t get any worse at this point until another piece of carbon breaks free. My OCD tells me to pull the jug, clean the exhaust port and piston crown and then take some scotch brite to the piston to clean the smear up.

I think your carb tune is running very rich, that`s a lot of carbon in and around the port. What does the muffler look like?

Plus this^^^.

 

[andyshine77]

If it's an everyday work saw you're likely fine. The issues is without removing the carbon it will happen again. It really depends on the person weather or not to pull the top end and clean things up, I likely would. Honestly I see this is part of the life cycle, for a everyday work saw IMHO. By the time things get bad enough it will likely be time to rebuild the top end anyway. We here are a bit too picky sometimes.

 

[Stump Shot]

Looks to me like a carbon smear on the piston. It likely won’t get any worse at this point until another piece of carbon breaks free. My OCD tells me to pull the jug, clean the exhaust port and piston crown and then take some scotch brite to the piston to clean the smear up.

Plus this^^^.

My (chainsaw) OCD may be worser than yours, I'd have to polish that port up to help keep it from happening again.

Bevel, don't forget the bevel on any smear jobs of any kind, stuff hides there waiting to re fark up the piston.

 

[merc_man]

I think your carb tune is running very rich, that`s a lot of carbon in and around the port. What does the muffler look like?

Muffler is pretty clean.
Little more on the saw history. I got the saw a basket case. The port was about that dirty when I got it. My tune is a little rich but not too bad. I always have it rich for a tank or so then tune it propper.
This was my first attemp to clean up a cylinder and i never thought the exhaust port was too bad. Lesson learned here though. Always will clean it up from now on. I had seen much worse then this and figured it would be fine.

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[Basher]

Muffler is pretty clean.
Little more on the saw history. I got the saw a basket case. The port was about that dirty when I got it. My tune is a little rich but not too bad. I always have it rich for a tank or so then tune it propper.
This was my first attemp to clean up a cylinder and i never thought the exhaust port was too bad. Lesson learned here though. Always will clean it up from now on. I had seen much worse then this and figured it would be fine.

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Maybe I have OCD but my saw ports never see any carbon buildup, I can wipe off any carbon color on the exhaust port down to bare aluminum with my finger tip so seeing crinkly carbon buildup I immediately think over fueling/running too rich.

 

[merc_man]

Got the exhaust port cleaned up today. Really happy with the red armour oil. Leavs nice oil coat on everything.

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[Basher]

Looks much better, what`s the plan now? Just clean it up and run it?