mixing ratios for 2 stroke chainsaws

[ZeroJunk]

I've used the acid trick before to save one off ported cylinders or those that are no longer available.
I wouldn't waste my time doing such when I new OEM piston and cylinder kit can be had for less than $300 bucks.
It's not a flex to half ass chit together. And it's certainly not a flex to fix a two stroke chainsaw as they are dead simple..

Whatever. I would rather fix one for $49 myself.

I'll go back on that a little. This saw is very, very much used.
If it was like new and straight gassed or something I would put a new OEM top end on it.
Lot of depends in all of this.

 

[bwalker]

There seems to be a theme on this thread among some folks that "50:1 or 40:1 are OK for the occasional homeowner use, but less than 32:1 is going to wipe out the bearings with professional, daily use" or to that effect.
When I worked at a tree service, all we EVER used were the 50:1 bottles of Husky XP oil in a gallon gas can in EVERYTHING. And Im talking Husky 332 climbing saws, 357xp and 372xp ground saws, some older 272's, and a 3120. Those saws got the PISS ran out of them day after day, month after month, for years, and there was never a bottom-end failure. Hours upon hours bucking up big old cottonwoods, elm, spruce and whatever we were dropping.
That's my firsthand experience, doesn't mean 32:1 couldn't make them last even longer though, but more use than the average guy would ever put on his bottom end bearings.

Most of the bottom end failures started with the move to strato charging, although 372's and 385's did have some.
I've always ran 32:1 because there isn't a downside other than cost and there are several upsides. You do you. With the hours most guys on this site accumulate on their saws they don't have to worry about premature wear or bearing failures regardless of ratio used. However if they used 32:1 they woukd make slightly more power and have more residual oil for corrosion protection, which is a significant deal for saws not ran daily.
One other thing. Tree work isn't as hard on saws as cutting firewood or logging based on the hours a saw is run in a day of each.

 

[Bjorn T]

There seems to be a theme on this thread among some folks that "50:1 or 40:1 are OK for the occasional homeowner use, but less than 32:1 is going to wipe out the bearings with professional, daily use" or to that effect.
When I worked at a tree service, all we EVER used were the 50:1 bottles of Husky XP oil in a gallon gas can in EVERYTHING. And Im talking Husky 332 climbing saws, 357xp and 372xp ground saws, some older 272's, and a 3120. Those saws got the PISS ran out of them day after day, month after month, for years, and there was never a bottom-end failure. Hours upon hours bucking up big old cottonwoods, elm, spruce and whatever we were dropping.
That's my firsthand experience, doesn't mean 32:1 couldn't make them last even longer though, but more use than the average guy would ever put on his bottom end bearings.

Hello, all saws you mention is good old saws. But try the new saws with x-torq and auto tune is more sensitive. 32:1 in the new modells Will make them hold longer.

 

[bwalker]

Hello, all saws you mention is good old saws. But try the new saws with x-torq and auto tune is more sensitive. 32:1 in the new modells Will make them hold longer.

It has nothing to do with autotune or mtronic.
It has to due with strato charging. Strato engines have heavier pistons and they are less lubricated than a traditional two stroke.

 

[Tomos770]

7days old video...

 

[Bjorn T]

It has nothing to do with autotune or mtronic.
It has to due with strato charging. Strato engines have heavier pistons and they are less lubricated than a traditional two stroke.

Sorry, I was thinking that almost all autotune or mtronic saws have Strato ports. And I agree that heavy piston and less lubrikation is very bad for bearings and give more cylinder and piston Wear.

 

[KASH]

I am a union construction electrician and here is what I know.
When a engineer makes a mistake it is called a revision but when I make a mistake it is called a F//k Up.
I learned early in the trade that one Oh F//k wipes out twenty Atta Boys.
Kash

 

[Stihl 041S]

And what does stihl say about 25:1?

I’ll would surprise some. They tell you to do it for most of you folks. Most

Prove me wrong.

 

[skeet88]

I am a union construction electrician and here is what I know.
When a engineer makes a mistake it is called a revision but when I make a mistake it is called a F//k Up.
I learned early in the trade that one Oh F//k wipes out twenty Atta Boys.
Kash

Boy I am screwed now! I was always told it was 10 Atta Boys . When I was a volunteer firefighter the Chief told me if I got 10 Atta Boys he would give me my Firefighter 101 certificate but 1 Ah wiped them out.I think the highest I got was 2 Atta Boys! Be Safe!

 

[camel2019]

And what does stihl say about 25:1?

I’ll would surprise some. They tell you to do it for most of you folks. Most

Prove me wrong.

Stihl manuals used to say something along the lines of mix 50:1 with Stihl oil and 25:1 with all other brands. My biggest thing about oil and home owners seem to think that it’s magic in a bottle the oil will mix at the ratio on the bottle into whatever amount of gas is in the can.

 

[rogue60]

Old high hr worked hard early ms880 25:1 mineral oil and lots of sawdust fines lol
Performing better than some of the expensive top tier synthetics by the looks
Saw was sitting for bout a year before I pulled it down for a look all the crank oil had pooled in the bottom of the crankcase in that time.
I better add NO I wouldn't run synthetics at 25:1 that'd be called overkill it would be spuing straight oil out the exhaust what a mess lol

 

[rogue60]

Carbon what carbon has never even had the spark arrester cleaned in all them years lol

 

[Tomos770]

Nice pattern on the piston top

 

[Lawless]

I've always ran 32:1 because there isn't a downside other than cost and there are several upsides. You do you. With the hours most guys on this site accumulate on their saws they don't have to worry about premature wear or bearing failures regardless of ratio used. However if they used 32:1 they woukd make slightly more power and have more residual oil for corrosion protection, which is a significant deal for saws not ran daily.

I think this is the ultimate truth from all of this. We have to as individuals decide what we’re comfortable doing and then live with it. It isn’t life or death….just a chainsaw. Red Armor I think from 50:1 - 32:1 will be fine and not ruin lives.

I did decide to change my practices based on some things I read here but not really based on fear I was damaging engines. There just does not seem to be a downside to using more oil than I was. Cheap insurance is a good thing, possibly more power and better storage is a bonus.

 

[ZeroJunk]

I think I am going to try some Amsoil.. Ninety percent of what I mix ends up dumped in a 55 gallon drum, but I do cut a little firewood and cleanup around the fields.

 

[bwalker]

I think this is the ultimate truth from all of this. We have to as individuals decide what we’re comfortable doing and then live with it. It isn’t life or death….just a chainsaw. Red Armor I think from 50:1 - 32:1 will be fine and not ruins lives.

I did decide to change my practices based on some things I read here but not really based on fear I was damaging engines. There just does not seem to be a downside to using more oil than I was. Cheap insurance is a good thing, possibly more power and better storage is a bonus.

Red Armour is a pretty unique in that the amount of residual oil it leaves behind is amazing for reasons I can't wrap my mind around. I would not worry at all about running it at 50:1 and 40:1 leaves more residual than many oils do at 32:1.

 

[bwalker]

Old high hr worked hard early ms880 25:1 mineral oil and lots of sawdust fines lol



Performing better than some of the expensive top tier synthetics by the looks 



Saw was sitting for bout a year before I pulled it down for a look all the crank oil had pooled in the bottom of the crankcase in that time.



I better add NO I wouldn't run synthetics at 25:1 that'd be called overkill it would be spuing straight oil out the exhaust what a mess lol









That's about what I would expect from a high hour saw ran at 25:1. Looks pretty damn good.
Synthetic gets thrown around alot and guys think it means alot. It doesn't. The majority of oils now are at least partially synthetic and many of those advertised as synthetic are only partially synthetic, which isn't a bad thing. There are downsides to straight synthetic oils.
In @Rougue60 case I would not be afraid to use certain synthetic oils at 25:1. I also would not run certain synthetics at that ratio for the reason he mentions. They can just end up getting puked out the exhaust and foul up your spark screen, muffler and exhaust port in the process.

 

[rogue60]

Ms661 mtronic tune fine on 25:1 I actually prefer the leaner 1st coil than the fatter later coils.
Here's one shown no mercy worked hard high hrs same mineral oil very pampered looked after saw yeah nah not really they love fines lol


I wiped all the oil off to get clear pics of the piston.

 

[bwalker]

Ms661 mtronic tune fine on 25:1 I actually prefer the leaner 1st coil than the fatter later coils.
Here's one shown no mercy worked hard high hrs same mineral oil very pampered looked after saw yeah nah not really they love fines lol
View attachment 1035050View attachment 1035051

I wiped all the oil off to get clear pics of the piston.
View attachment 1035052View attachment 1035053

I'm not sure where the idea that Mtronic or Autotune can't deal with a change in oil ratio. IME both systems certainly can.

 

[rogue60]

I'm not sure where the idea that Mtronic or Autotune can't deal with a change in oil ratio. IME both systems certainly can.

I don't have any experience with smaller mtronic saws or whatever it is husky run but the ms661 tunes fine on 25:1 mineral oil.
In saying that I'd take a tunable carb any day I actually like tuning.