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#4805555 - 07/05/18 08:55 AM Best Additive for 2 cycle gas?
njohnson Offline


Registered: 05/30/07
Posts: 585
Loc: Indiana
Hi everyone,

I have a question. What is the best additive for 2 cycle gas? I have a Stihl chainsaw and string trimer. They are about ten years old. I have been using Stihl 2 cycle oil and 89 octane gas. Have not had any major trouble up until now, they both started when I went to use them. Then, this last tank of gas, I went to use the trimer and I couldn't get it started. I don't if it is bad gas or maybe ethanol in the gas finally caused issues?

I know using ethanol free is better for the 2 cycle equipment, the problem is, the closest station that has it is about an hour away.

What can I do to get the trimer running again? And if I can get it running, is there an additive I can use to clean things up?

I noticed in the last couple of years, there is a number of additives that are now on the shelves to treat ethanol gas. What is the best way to avoid issues like this (not starting) going forward?

Thanks,

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#4805563 - 07/05/18 09:01 AM Re: Best Additive for 2 cycle gas? [Re: njohnson]
Phishin Offline


Registered: 05/01/12
Posts: 2459
Loc: Indiana
Dump the crummy gas out of it and re-fill with fresh gas. Prime it well. See if it will start.

We have ethanol free gas here in Angola. It's called "Recreational Gas"...because the boaters want it. I use that and the Stihl synthetic 2T oil. It's already got fuel stabilizer in it. I've never had a problem.

If fresh gas and oil doesn't work...if it was me, I'd put a healthy dose of Berryman B12 in the fuel and try to clean up the carb with that.
_________________________
2018 Chevy Silerado 3500HD 6.0L Gas: Undecided
2010 Accord-LX K24: VSP 0w20/MaxLife 10w30 + LG BioTech HD
2014 CR-V LX K24: M1 0w30

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#4805569 - 07/05/18 09:04 AM Re: Best Additive for 2 cycle gas? [Re: njohnson]
barkingspider Offline


Registered: 12/22/13
Posts: 2064
Loc: socal
Home Depot has 2 cycle fuel that is ethanol free. Give the carb a good cleaning, replace the fuel lines, fuel filter, air filter and spark plug. Good luck
_________________________
06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
05 Toyota Camry (daughter)
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#4805570 - 07/05/18 09:04 AM Re: Best Additive for 2 cycle gas? [Re: njohnson]
CT8 Offline


Registered: 10/09/14
Posts: 11224
Loc: Idaho
2 cycle oil
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"Don't let your preconceived notions get in the way of facts."
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#4805576 - 07/05/18 09:07 AM Re: Best Additive for 2 cycle gas? [Re: njohnson]
dave123 Offline


Registered: 01/13/09
Posts: 2336
Loc: wi
VPracing SEF you can not fix problems of ethanol gas if it contains it. Engineered fuel is your best bet if small use or any use or at least shut unit down and store with engineered fuel.

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#4805609 - 07/05/18 09:31 AM Re: Best Additive for 2 cycle gas? [Re: njohnson]
Panzerman Offline


Registered: 12/16/06
Posts: 4213
Loc: Port Orange, Florida
I am Mr. Two Stroke, if I can get it in two stroke I do. Since I started using SeaFoam mixed per their instructions on the can to stabilize the gas, I have had zero problems and some stuff sits over a YEAR.
Three lawnboys, Echo trimmer and Homelight and echo blower plus countless two stoke ATVs and motorcycles. SeaFoam works, Stabil let me down, the red stuff anyway. Never tried the Blue Marine stuff.
I've heard good stuff about Startron but I am not really having issues since I started SeaFoam so I can't comment if its better or not.


Edited by Panzerman (07/05/18 09:32 AM)
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2006 Dodge Ram 2500 Hemi 4x4
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#4805612 - 07/05/18 09:36 AM Re: Best Additive for 2 cycle gas? [Re: njohnson]
Panzerman Offline


Registered: 12/16/06
Posts: 4213
Loc: Port Orange, Florida
BTW my last Craftsman Weed trimmer two stoke lasted over 20 years and still ran good but was getting hard to start so my wife bought me a brand new Echo trimmer for Christmas. No engine issues with it in over 20 years of running it. 23 years to be exact.
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2006 Dodge Ram 2500 Hemi 4x4
2016 Dodge Challenger Scat Pack

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#4805632 - 07/05/18 09:51 AM Re: Best Additive for 2 cycle gas? [Re: njohnson]
Crispysea Offline


Registered: 04/14/17
Posts: 418
Loc: TN USA
B12 is great, and so is Techron. Definitely stay away from ethanol gas, if you can.

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#4805691 - 07/05/18 10:32 AM Re: Best Additive for 2 cycle gas? [Re: njohnson]
Gixxer46 Offline


Registered: 06/06/18
Posts: 35
Loc: Canada
Powershot from Amsoil
_________________________
2013 Ram 1500 with a 4.7.

I use 0W-20 year round. I alternate between RP and Amsoil Signature series.

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#4805713 - 07/05/18 11:02 AM Re: Best Additive for 2 cycle gas? [Re: Phishin]
WyrTwister Offline


Registered: 01/13/13
Posts: 1584
Loc: Texas
Originally Posted By: Phishin
Dump the crummy gas out of it and re-fill with fresh gas. Prime it well. See if it will start.

We have ethanol free gas here in Angola. It's called "Recreational Gas"...because the boaters want it. I use that and the Stihl synthetic 2T oil. It's already got fuel stabilizer in it. I've never had a problem.

If fresh gas and oil doesn't work...if it was me, I'd put a healthy dose of Berryman B12 in the fuel and try to clean up the carb with that.


A cousin of mine gave me an old 2 cycle Weed Eater string trimmer . The little plastic fuel lines had gotten brittle and started breaking . I replaced the lines , mixed up some 100% unleaded & 2 cycle oil . Had to pour a little fuel into the carb to get it to start . Got it running , but not well .

Couple of days latter , bought some B12 Chemtool and put a little in the tank . Seems to help it , running OK . During this , the primer bulb split & started leaking . Hot that on order , from ebay .

So , yes , try a little B12 Chemtool .
_________________________
Wyr
God bless

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#4805726 - 07/05/18 11:28 AM Re: Best Additive for 2 cycle gas? [Re: njohnson]
WyrTwister Offline


Registered: 01/13/13
Posts: 1584
Loc: Texas
By the way , any small engine , last time you use it for the season , run it dry .

My SOP when I get ready to start a computer , next season , is new gas or gas / oil mix . Change the oil on 4 cycle engines . Replace the spark plug & air filter , if it needs it .

Wyr
God bless
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Wyr
God bless

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#4805761 - 07/05/18 12:04 PM Re: Best Additive for 2 cycle gas? [Re: njohnson]
Panzerman Offline


Registered: 12/16/06
Posts: 4213
Loc: Port Orange, Florida
I am a little scared of the B12. I d use it very moderately. It dissolves plastic. I only cleaned carbs with it and very little will stand up against this stuff but if put it in plastic measuring cup, it starts to cloud it and soften it big time.
It's usually my last resort, take apart carb cleaner, especially in small, lots of plastic parts motors. This stuff is probably the most potent varnish remover I know of.


Edited by Panzerman (07/05/18 12:06 PM)
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2006 Dodge Ram 2500 Hemi 4x4
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#4805764 - 07/05/18 12:08 PM Re: Best Additive for 2 cycle gas? [Re: njohnson]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1884
Loc: Saskatchewan, Canada
I buy Mercury or Yamaha 2-cycle oil, but if I'm in the Chain Saw shop I'll buy what they're selling as long as I don't fall over at the price.

Gasoline gets eaten by bacteria (if it smells bad, it's bug [censored] you're smelling) so it's perishable and won't last long (a year is "long"). Fresh fuel usually clears that up.
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'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
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'01 PT Cruiser [Mobil1 0W-40]

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#4805773 - 07/05/18 12:15 PM Re: Best Additive for 2 cycle gas? [Re: njohnson]
vwmaniaman Offline


Registered: 04/18/13
Posts: 144
Loc: Kevil,Ky
I met a man at a flea market with a trailer full of string trimmers and chain saws an leaf blowers. All were 2 stroke. I asked him where he got them all and he told me that he picked them up out of other peoples trash. Asked him if they were hard to get working and he told me that he just drains all the old gas first. He then adds a 1/4th cup of seafoam and fills the rest of the tank with good 2 stroke 30:1 gas. So I had an old weadeater leaf blower that I got after my Dad passed. I know that it had been sitting at least 12 years. Son had put gas in it to see if it would run. He pulled it a lot with no results. I emptied out that gas and then put in the seafoam. Pulled the rope 2 times and primed it with it first and then added the gas. Started on the second pull and ran all day. Had to refill tank once and still started right back up. I am a believer in seafoam.
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Don't waste your time on a slipshod repair.

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#4805828 - 07/05/18 12:56 PM Re: Best Additive for 2 cycle gas? [Re: njohnson]
TheLawnRanger Offline


Registered: 03/18/18
Posts: 497
Loc: Mississippi
I use ethanol free gas so I don't use an additive. But if I did, I would use Sea Foam or Stabil. I've heard good things about both. The ethanol free gas can get expensive. Regular gas is fine by itself if you don't leave it in for long periods when not in use.


Edited by TheLawnRanger (07/05/18 12:58 PM)
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'99 Cavalier 5w 30 SuperTech conventional
'11 Impala 5w 30 Magnatec full synthetic
'12 Colorado 5w 30 Magnatec full synthetic
*regular Wix oil filters for all

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