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2 stroke equipment mix ratio #5412815 04/25/20 12:46 PM
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alex_at Offline OP
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I recently started to clean up my 10700 squarefeet property. I bought an additional 2 stroke weed eater, house brand from a local hardware store. Manual calls for 1:40, I ran the first tank 1:25 but I got some popping noise under load. I believe that is called "popcorning".

I do have 2 Stihl chainsaws, a MS170 and a MS180, both call for 1:50. I have a small bottle Stihl HP Ultra oil as well as a 5 liter jug of Stihl Motomix. (Alcylate fuel with 1:50 Stihl HP Ultra).

Now the question is: Do I run my chainsaws 1:50? On arboristsite.com I read that many professionals run 1:40 and get much more life out of their equipment, some even 1:32 or 1:25

First tank on my MS180 I ran 1:40, the MS170 still sits in the box. A disadvantage of the MS170 and MS180 is a fixed jet carb, only idle speed is adjustable.

So what do I do? Simply run Stihl Motomix straight? Mix additional Stihl HP Ultra an bring the mix to 1:45 or 1:40? Or do I create a leaned out environment and do more harm than good long term?

The weed eater will get regular gas with part synth. 1:40, done. Was cheap and if it breaks it breaks. I suspect the engine will be the last thing to go bad on that thing.


Thanks for your patience, these 2 Stihls and store brand weed eater are my first 2 stroke machines that I ever had.


Last edited by alex_at; 04/25/20 12:47 PM.
Re: 2 stroke equipment mix ratio [Re: alex_at] #5412823 04/25/20 12:57 PM
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IveBeenRued Offline
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Originally Posted by alex_at
I recently started to clean up my 10700 squarefeet property. I bought an additional 2 stroke weed eater, house brand from a local hardware store. Manual calls for 1:40, I ran the first tank 1:25 but I got some popping noise under load. I believe that is called "popcorning".

I do have 2 Stihl chainsaws, a MS170 and a MS180, both call for 1:50. I have a small bottle Stihl HP Ultra oil as well as a 5 liter jug of Stihl Motomix. (Alcylate fuel with 1:50 Stihl HP Ultra).

Now the question is: Do I run my chainsaws 1:50? On arboristsite.com I read that many professionals run 1:40 and get much more life out of their equipment, some even 1:32 or 1:25

First tank on my MS180 I ran 1:40, the MS170 still sits in the box. A disadvantage of the MS170 and MS180 is a fixed jet carb, only idle speed is adjustable.

So what do I do? Simply run Stihl Motomix straight? Mix additional Stihl HP Ultra an bring the mix to 1:45 or 1:40? Or do I create a leaned out environment and do more harm than good long term?

The weed eater will get regular gas with part synth. 1:40, done. Was cheap and if it breaks it breaks. I suspect the engine will be the last thing to go bad on that thing.


Thanks for your patience, these 2 Stihls and store brand weed eater are my first 2 stroke machines that I ever had.



On such a small property, I doubt you will run into longevity issues with these motors. I’d just buy Motomix a similar product and I wouldn’t mess with the ratios and just run whatever each device calls for.

For a quarter acre, I’m surprised you aren’t using battery powered devices. On my one acre property, I can trim all 660 feet of fencing, around all my trees, and around the garage on one 2 amp hour battery in my Echo cordless trimmer.


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Re: 2 stroke equipment mix ratio [Re: alex_at] #5412828 04/25/20 01:00 PM
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Dave9 Offline
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Yes, as long as the engine fuel ratio (and carb quality) allows for a richer oil mix (doesn't bog down) the engine will last longer. The EPA won't like you, and you'll have to clean carbon off the exhaust port and out of the muffler, particularly the spark screen, more often.

I don't run anything leaner than 1:40 and only that lean with synthetic oil. 1:25 is too rich, you'll get little extra benefit compared to the burden of performance and cleaning. Granted, older equipment isn't set up to run fuel as lean so there's that. The more fuel it's putting through, the more oil too at any given ratio.

Re: 2 stroke equipment mix ratio [Re: alex_at] #5412831 04/25/20 01:02 PM
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alex_at Offline OP
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IveBeenRued, I did check battery powered equipment. My local shop didn't recommend me the battery saws as they don't have that much cutting power as the gas powered ones. My concern as well with the chain saws was the battery storage and longevity. I use them to clean up, sell one keep the other. Then the battery most likely will be sitting more than it will get used. My experience with that is that the battery will be dead next time I want to use it.

I did look at battery powered push mowers, mainly for noise emmissions, so I thought I could use them late afternoon. But most of them in the up to 500$ range had a recommendation for maximum half the size of the property, the cheaper ones a quarter size. Same with the weed eaters. That's why I went with gas powered equipment.

So, I will stick with Stihl Motomix ready to use gas for the chainsaws and the cheap weed eater I will use regular gas with 40:1 part synth oil, which I have plenty of laying around for Diesel lubrication.

Last edited by alex_at; 04/25/20 01:03 PM.
Re: 2 stroke equipment mix ratio [Re: IveBeenRued] #5412844 04/25/20 01:17 PM
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Dave9 Offline
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Quote
For a quarter acre, I’m surprised you aren’t using battery powered devices. On my one acre property, I can trim all 660 feet of fencing, around all my trees, and around the garage on one 2 amp hour battery in my Echo cordless trimmer.


Okay but what did that trimmer cost and how many years have you gotten out of it?

Looking at cost versus lifespan (including replacement batteries for the cordless), it tends to cost over twice as much to get the same work done with cordless, and only in recent years with (more expensive) 40+ volt systems, have cordless had remotely close to same performance as gas.

Then again my property borders a (somewhat unkept) field, and I have multiple garden areas so I need something with some grunt, an 18V wouldn't cut it (pun intended) despite that being really handy if it could due to being able to use same batteries as my other 18V cordless tools.

I'll stick with gas for anything demanding and/or that I'll likely use more than 20 minutes at a time, like chainsaw, mower, edger, snow blower, and still for a while longer till battery cost:performance ratio improves, weed wacker.

Last edited by Dave9; 04/25/20 01:21 PM.
Re: 2 stroke equipment mix ratio [Re: alex_at] #5412845 04/25/20 01:18 PM
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dave123 Offline
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Stihl 261 362 250
Husqvarna XP576
Tanaka pro trimmer
Echo blower
Lawn boy mower
All get C9 VPracing fuel mixed with VPracing 2stroke oil 40:1 I would and do use that mix on anything and everything OPE related no mater equipment recommendations and have been for years.

Re: 2 stroke equipment mix ratio [Re: alex_at] #5412897 04/25/20 02:05 PM
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I have been running 40:1 in my stuff with a good oil for decades with no oil related problems.


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Re: 2 stroke equipment mix ratio [Re: alex_at] #5412927 04/25/20 02:40 PM
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40:1.....32:1 in stuff that revvs @12.500rpms++ (550xp 560xp)


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Re: 2 stroke equipment mix ratio [Re: alex_at] #5412938 04/25/20 02:53 PM
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alex_at Offline OP
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so, if 40:1 gets the most recommendations so far - I would use 40:1 in my MS170, MS180 - but the high speed side of the carb is non adustable, would I still be in a safe, not too lean ratio?

And mix my Stihl Motomix with some extra Stihl HP Ultra?

Re: 2 stroke equipment mix ratio [Re: alex_at] #5412940 04/25/20 02:53 PM
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I’m a newbie. I follow the owners manuals. All of them call for 1:50, so that’s what I ran during break-in and what I’ll continue to run. I mainly heeded the advice from those on arborist sites, who seem to agree that there’s no benefit of running rich, but there is the risk of gumming things up.


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Re: 2 stroke equipment mix ratio [Re: Kamele0N] #5412941 04/25/20 02:54 PM
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Chris142 Online Content
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Originally Posted by Kamele0N
40:1.....32:1 in stuff that revvs @12.500rpms++ (550xp 560xp)

That is what I did. For trail riding I used 40:1. For blasting up sand dunes in the desert I ran 32:1.

I understand that the oil in the fuel ratio effected the air/ fuel ratio but I never had to mess with jetting when changing oil ratios.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
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Re: 2 stroke equipment mix ratio [Re: gathermewool] #5412947 04/25/20 03:02 PM
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Dave9 Offline
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Originally Posted by gathermewool
I’m a newbie. I follow the owners manuals. All of them call for 1:50, so that’s what I ran during break-in and what I’ll continue to run. I mainly needed the advice from those on arborist sites, who seem to agree that there’s no benefit of running rich, but there is the risk of gumming things up.


Pretty sure you have that backwards, most pros do not use as low as 1:50, especially not those who repair their own equipment which should tell you something.

Re: 2 stroke equipment mix ratio [Re: Dave9] #5412952 04/25/20 03:06 PM
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Originally Posted by Dave9
Originally Posted by gathermewool
I’m a newbie. I follow the owners manuals. All of them call for 1:50, so that’s what I ran during break-in and what I’ll continue to run. I mainly needed the advice from those on arborist sites, who seem to agree that there’s no benefit of running rich, but there is the risk of gumming things up.


Pretty sure you have that backwards, most pros do not use as low as 1:50, especially not those who repair their own equipment which should tell you something.


Like I said, all I have to go on is my manual and the etherwebs. I trusted the arborist site members and where ever else seemed legit when I researched this last year.

Do you know of any 1:50 failures in MODERN equipment (eg, last 15 years)? Seriously, not being sarcastic.


14 Forester XT Touring FA20DIT (Cobb Stage 1)
Castrol Magnatec 5W-30 D1G2 + FU filter (2nd OFI) (77,760mi, 3/7/20)
15 Legacy Premium FB25
Magnatec 0W-20 D1G2+ FU filter (2nd OFI) (54,621mi, 3/4/20)
Re: 2 stroke equipment mix ratio [Re: alex_at] #5412955 04/25/20 03:08 PM
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dave123 Offline
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Not true I bet most are at 44:1 3oz per gallon or better many still run 32:1 in everything.

Re: 2 stroke equipment mix ratio [Re: alex_at] #5412965 04/25/20 03:29 PM
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tundraotto Offline
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I do 38:1 on all mine.

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