Stihl 038 problem!

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Joined
Apr 14, 2020
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Oregon
New here and hope I can find some help.
Hear is the history on the saw. I bought the saw not in working order but had good compression . I replaced the carb, fuel filter and line , new air filter, tank vent and hose, and spark plug. Cut 2 loads of wood and was very impressed with the power and ran it great. Next time out I was cutting a large pine and doing fine and then acted as if I ran out of gas. I checked the tank and was half full so checked air filter and not bad I then replaced the coil checked the plug. It will run great with no load but will only cut for about 2 minutes before it starts to bog and acts like its out of fuel. Fuel filter still look new, tried different carb, and gas is fresh. I have noticed the air filter does have some gas wetness in front. Any ideas?
 
the piston on the exhaust side and the cylinder wall on the intake side booth look smooth and shiney
 

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