GerrySM
ArboristSite Operative
I have big saws but now only use this small chainsaw because a back injury means I cannot handle the heavier ones.
MS170 is 2 years old, suddenly developed a bogging out problem in the middle of a cut.
My suspicion is contamination via the air intake
When I remove the cover (13), I find the upper surface of the filter (2) heavily contaminated (this is an aftermarket eBay filter, perhaps it is not sealing properly?). There is oily sawdust on part 4, and if I put my finger into the intake vent on 3, it comes out contaminated with fine, slightly oily sawdust as well. I found this a bit shocking, as this area is supposed to be pristine, right?
I cleaned it all out as best I could, but the contamination occurred again, and I'm worried that some of this gunk has got into the carb. The saw loses power and almost stalls in deep cuts now. (There is no way to alter the fuel mixture on this machine, btw).
Is my next step a carb cleanout? I hope none of this stuff has damaged the piston ....
MS170 is 2 years old, suddenly developed a bogging out problem in the middle of a cut.
- Muffler screen is clean.
- Spark plug and chain are new.
- Bar nose sprocket turns easily.
- Fuel is fresh and correctly mixed.
- Fuel filter is clean.
My suspicion is contamination via the air intake
When I remove the cover (13), I find the upper surface of the filter (2) heavily contaminated (this is an aftermarket eBay filter, perhaps it is not sealing properly?). There is oily sawdust on part 4, and if I put my finger into the intake vent on 3, it comes out contaminated with fine, slightly oily sawdust as well. I found this a bit shocking, as this area is supposed to be pristine, right?
I cleaned it all out as best I could, but the contamination occurred again, and I'm worried that some of this gunk has got into the carb. The saw loses power and almost stalls in deep cuts now. (There is no way to alter the fuel mixture on this machine, btw).
Is my next step a carb cleanout? I hope none of this stuff has damaged the piston ....