Chainsaw bogging down

[fireview2788]

I've got an ancient Stihl S10 that runs really well and cuts great. However, lately as I'm working through a log it start to bog down when I get about half way through. It gets to the point where the chain stops circulating. I back it out, throttle it, and start again. It runs hard and fast when it's not cutting. I just got the chain back from being sharpened so it's not a dull chain.

I wondering if it's a dirt carb or air filter issue. What's the experts think?


Thanks,
fv

 

[CrufflerJJ]

If it's not just a simple thing like adjusting the carb or changing/cleaning the air filter, you might want to have the saw's compression checked. It may just be worn out, needing some new rings on the piston.

 

[Jags]

It could be a couple of different things. Running out of fuel (leaning out) is possible. Air infiltration. Clogged air or fuel filter, cracked fuel line, etc.

 

[CrufflerJJ]

The saw is probably about 45-50 years old, so there's no telling what's worn/broken.

 

[fireview2788]

The saw is probably about 45-50 years old, so there's no telling what's worn/broken.

I did have it checked out a couple of years ago and it got a clean bill of health. Yes, I am thinking about buying a new, lighter saw. This thing is like lifting a brick.

fv

 

[TedyOH]

My 075 was doing the same thing, ended up being the screws(under the air filter) that hold the carb to the engine came loose, plus the gasket was cracked, cut a new one from that cork gasket material and runs like a champ.

 

[Jazzberry]

Don't forget to check the spark arrestor. I check for bad gas, air filter, plugged or dirty spark screen then compression.

 

[dougand3]

Try a simple compression test. Switch in OFF position. Hold starter handle with saw at waist level. Let go of saw. Does it go? Lug.........Lug.........Lug........Lug = good. or Lug..Lug..Lug..Lug = bad.