So the backstory is I have a couple small residential saws ms170 and ms 250 that I’ve always ran 50:1 in and a ms440 that I run 40:1 in. After reading more I decided to just go 40:1 across the spectrum. I’ve ran 5-6 tanks of 40:1 through the 250 with no issue. Maybe a hair more smoke on full throttle but nothing to write home about. Yesterday I took it out (I use it to limb trees i fell with the 440 because it’s so much lighter) it cranked then stalled, cranked again then stalled, then got to where it wouldn’t crank again at all just turned over. I took the plug out and it was def fouled but the air filter wasn’t “dirty” per se but it had a black stain you can see in pics. I took it in and washed it, got very little debris off of it and none of the black removed at all. You can wipe this thing on a white shirt with no residue. To me it looks like oil but doesn’t feel like oil. I thought I would probably have to re-tune it after switching to 40:1 but it ran great those 4-5 tanks so I never messed with it.
Turns out I went out today and cranked it up and it ran like a sewing machine again so I guess I just flooded it which seems weird but whatever. Still wondering about the air filter though. Figured I’d post some pics while I wait for some new filters to arrive. Thanks in advance!
Turns out I went out today and cranked it up and it ran like a sewing machine again so I guess I just flooded it which seems weird but whatever. Still wondering about the air filter though. Figured I’d post some pics while I wait for some new filters to arrive. Thanks in advance!