2-stroke mixes age-resistant?

Status
Not open for further replies.
Joined
Oct 25, 2007
Messages
1,373
Location
Somerset County, PA
A buddy of mine stopped by the other day to look at buying a chainsaw. He purchased some property and wants to clear out some trees, mostly mountain hardwoods (cherry/oak/maple/beech) that have fallen, been knocked over by the last guy who timbered the property, and/or are standing.

He has an old 015 Stihl, which is great for limbing and small stuff, but not the best for consistently cutting anything 8" or larger (it can be done, it's just a lot easier with a bigger saw). The guy's a contractor, and has experience with a variety of larger saws, but they'd all been beat up by the guys who used them before, and he wanted to try some clean ones out before he bought one for himself. I have a pile of saws, Stihls and Husky's, that I got back in 2000 and 2001 for a project I did clearing a few acres for my niece's house. The saws have been sitting since late '04, with the mix (50:1 poulan synthetic/89 octane) in the tanks. I dug out a couple saws for him to try, a 357XP Husky, a 365 Husky (my favorite, which they've stopped making
frown.gif
) and an 046 Stihl Magnum (a brute). They'd been sitting in my unheated garage (temps ranging from 15 - 35 degrees). We cleaned off the accumulated crud, cleaned up the plugs and such, and they all fired up within 5 or 6 pulls. We ran the old gas through them and put in fresh mix, and he's out cutting away, trying to decide which one of them he likes best.

I had a similar experience with on old 056AV Stihl (so old it doesn't have a blade brake or compression release on it!!) that sat for 5 or 6 years, then fired up within 5 pulls.

The point of all this is, you hear about gas aging, and gumming things up, but, for whatever reason, I really haven't noticed it when it's mixed. Anyone else have similar, or opposite, results?
54.gif
 
It's actually more likely to age when mixed than not, unless a stabiliser is also part of the oil as greenaccord has noted.

The pro saw manufacturers recommend dumping the mix after six to eight weeks to prevent a problem occurring. I've heard of a number of people trying to start a saw after sitting for twelve months or so and when stripped all they have are globules of jelly in the carby and tank.
 
From experience I can say Amsoil Sabre' Synthetic 2-stroke is good for a year + when mixed.

I usually try to go about every 6 months to be safe.

The unmixed product is fine for a couple of years by my experience.
 
Find 4 strokes have more of a problem with fuel varnish than 2 smokers. Think it's the oil in the fuel coating the parts so the varnish doesn't stick. With a saw the tank is also pretty much sealed (you don't want gas dribbling out when you rotate the saw), so there probably isn't as much evaporative effect or exposure to water in the air? Also a saw only basically has two jet circuits with adjusters, so they might be a bit bigger orifices than other carbs that are more precisely metered?
 
It depends on what you run the mix in......I can run 2 year old mix in a Stihl, but it goes bad on the way home from the station when I put it in a Poulan...
LOL.gif


I have gone 3-4 months carrying lawnboy mix over the winter with no ill effects. But generally I use the saw, tiller, trimmer blower mix in weeks, and dump for winter storage. Lawnboy and Stihl oils have a stabilizer and I use seafoam in all my small engine gas.

Those are nice saws, I would treat them to some new gas if it was up to me.
 
Last edited:
I agree to a very large extent as Cmarti mentioned, it depends on what it is run in. My Stihl chain saw will tolerate aged mix, as will my Homelite leaf blower but my Tanaka TBC355 monster brush cutter gets a bit cantankerous, and the little Echo residential-grade trimmer is just plain ornery to begin with...

I have found that running about 30-50% toluene plus two-stroke oil makes the aforementioned OPE quite happy. Don't know about the aging characteristics of such mix, though.
 
Ditto to the above. Anything I put in my Stihl saw or blower runs fine. I just started using the opti 2 100:1 on all my stuff so I dont even worry anymore since it has a stabilizer.
 
Status
Not open for further replies.
Back
Top Bottom