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Old 09-25-2011, 02:17 PM   #1
V-10 Killer
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Default Any tips for getting chainsaw to start after bad gas?

I guess I went too long. I have a Stihl chainsaw that I used last year that I tried firing up this year and zero luck getting it to fire. I swapped the sparkplugs and got fresh gas, but still no luck. I also have a Stihl weedwhip that will start and run til about half throttle, but beyond that it floods out. Stuck float maybe?
Any tips y'all can share in getting 2 cycle engines to run right after a bout with bad gasoline?
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Old 09-25-2011, 02:57 PM   #2
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Default Re: Any tips for getting chainsaw to start after bad gas?

Pull the plug, put about a teaspoonful of good gas/oil mix in the combustion chamber, re-install the plug and try to start it again. It should run. You might need to put another teaspoonful in if the first one isn't enough to suck good gas into the carb. If it still won't suck good gas into the carb, clean the fuel line and strainer.
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Old 09-25-2011, 03:29 PM   #3
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Default Re: Any tips for getting chainsaw to start after bad gas?

dont dump liquid gasoline into the combustion chamber. Liquid doesnt burn.

Buy a can of starter fluid take the air filter out and give it a shot, try to start.
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Old 09-25-2011, 04:13 PM   #4
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Default Re: Any tips for getting chainsaw to start after bad gas?

P:

That better not be a Stihl that was bought here in town. I went round and round with the guys i got mine from. I got a thread about it somewhere here on the 'journal.

As for the weed whip, I had Beebo rebuild the carb on my FS80 and it runs like a dream.
Your not at work now are you? I am.
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Old 09-25-2011, 04:24 PM   #5
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Default Re: Any tips for getting chainsaw to start after bad gas?

Hey Kirk
No, amazingly I'm at home today. Now that I've crossed 700 OT hours so far this year, I managed to get a week off.
I got both of them down the road at the Stihl dealer. MS210 saw and FS40C whip. I swear I could burn through a tree faster than those new safety blades can cut on those new saws. I just picked up an "agressive cut" blade for the saw, hopefully that'll help when I get it running...
And the line release on the whip sucked so bad that I actually had to stop the spool on the ground and then tip it up and release more cable by hand. I've since replaced it with the 3 nylon blade spool and that works pretty well.
Looking back, maybe I should have got a Husqvuarna instead.
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Old 09-25-2011, 04:53 PM   #6
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Default Re: Any tips for getting chainsaw to start after bad gas?

My new (1.5yr) ms 250 seems to cut great, thankfully. I had to take it back and have them go thru the carb. It would take me 30 pulls to get it started. They got it right, thankfully. Heading home now.
Later
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Old 09-25-2011, 05:05 PM   #7
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Default Re: Any tips for getting chainsaw to start after bad gas?

STA-BIL fuel stabilizer sold at Home Depot. put about a cap full in with the bad gas. Fire it up, let it burn off the old gas and replace with fresh gas. Did it last weekend for a neighbor, who was about to have a lawnmower repair shop fix it for $75.00
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Old 09-25-2011, 05:24 PM   #8
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Default Re: Any tips for getting chainsaw to start after bad gas?

skin wrote: "dont dump liquid gasoline into the combustion chamber. Liquid doesnt burn."(sic)

Gee, that's funny. It works for me every time I have this problem. Have you ever tried it?
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Old 09-25-2011, 05:46 PM   #9
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Default Re: Any tips for getting chainsaw to start after bad gas?

Sta-Bil works well for me. I have both Stihl chainsaw and weed and garden whacker. Sometimes if they dont fire up right away I take out the plug and clean and blow it dry with compressed air. Since I have been using sta-bil it hasn't taken more than three pulls to start them even after winter storage.
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Old 09-25-2011, 06:32 PM   #10
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Default Re: Any tips for getting chainsaw to start after bad gas?

I had a weed whacker that had was suffering from either bad gas or gas left around a little too long. Seafoam worked wonders.

I followed the directions on the can. IIRC, basically mix it rich, pour in the tank, run the engine briefly to get it into the carb and then let it sit for a few minutes. When I started it again, I made a nice smokescreen in my backyard! That was early spring...it's still running great.
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Old 09-25-2011, 06:53 PM   #11
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Default Re: Any tips for getting chainsaw to start after bad gas?

Not that it's guaranteed to get it restarted, but in my blower and mower I've been running non ethanol gas. It has a longer shelf life, especially with Sta-bil added. Go to http://pure-gas.org/index.jsp to find a non ethanol station nearby. Also, if there is a small airport nearby, their av gas has no ethanol.
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Old 09-25-2011, 07:08 PM   #12
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Default Re: Any tips for getting chainsaw to start after bad gas?

Quote:
Originally Posted by softailgarage View Post
STA-BIL fuel stabilizer sold at Home Depot. put about a cap full in with the bad gas. Fire it up, let it burn off the old gas and replace with fresh gas. Did it last weekend for a neighbor, who was about to have a lawnmower repair shop fix it for $75.00
Fuel stabilizer doesnt make bad gas good or better in any way. It can actually do the exact opposite. You'd be better off adding fresh fuel to the bad gas if not outright draining it completely. Also most 2-cycle oils have stabil already added.

Quote:
Originally Posted by Bill Crowell View Post
skin wrote: "dont dump liquid gasoline into the combustion chamber. Liquid doesnt burn."(sic)

Gee, that's funny. It works for me every time I have this problem. Have you ever tried it?
Doesnt change the fact that liquid doesnt burn. Starter fluid is actually designed to act just like fuel vapor without risking flooding or fouling.

Last edited by Skin; 09-25-2011 at 11:40 PM.
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Old 09-25-2011, 07:23 PM   #13
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Default Re: Any tips for getting chainsaw to start after bad gas?

I ususally take the plug out and pull the cord about a half dozen times. If I don't have a new plug, I'll clean the old and put it back in after the 6 pulls. It helps make the excess fuel (drowned out) evaporate.
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Old 09-25-2011, 08:14 PM   #14
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Default Re: Any tips for getting chainsaw to start after bad gas?

One thing that has not been mentioned is that most 2 cycle mfgs recommend premium gas not the 87 octane stuff. On just one or two gallons it won't break the wallet each time but I know my two cycle stuff does run a lot better on the high test gas. Drain tank, clean plug, new gas, primer bulb and starting fluid will get them going.
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Old 09-25-2011, 08:17 PM   #15
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Default Re: Any tips for getting chainsaw to start after bad gas?

Quote:
Originally Posted by Milton Shaw View Post
One thing that has not been mentioned is that most 2 cycle mfgs recommend premium gas not the 87 octane stuff. On just one or two gallons it won't break the wallet each time but I know my two cycle stuff does run a lot better on the high test gas. Drain tank, clean plug, new gas, primer bulb and starting fluid will get them going.
Stihl recommends 89. I've never used premium.
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Old 09-25-2011, 08:46 PM   #16
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Default Re: Any tips for getting chainsaw to start after bad gas?

I have bad gas right now...
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Old 09-25-2011, 08:59 PM   #17
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Default Re: Any tips for getting chainsaw to start after bad gas?

"Gee, that's funny. It works for me every time I have this problem. Have you ever tried it?"

Skin wrote" "Doesnt change the fact that liquid doesnt burn." (sic)

Oh, so you've never tried it. You really shouldn't contradict people when you don't know what you're talking about.
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Old 09-25-2011, 11:38 PM   #18
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Default Re: Any tips for getting chainsaw to start after bad gas?

Quote:
Originally Posted by Bill Crowell View Post
"Gee, that's funny. It works for me every time I have this problem. Have you ever tried it?"

Skin wrote" "Doesnt change the fact that liquid doesnt burn." (sic)

Oh, so you've never tried it. You really shouldn't contradict people when you don't know what you're talking about.
Yep thats it i dont know what i'm talking about

Fact. Liquid fuel does not burn. Infact liquid gasoline in the combustion chamber is what leads to fouling.
Fact. There are better ways to add a fuel.

Someone who simply dumps fuel straight into the head may get lucky but that doesnt mean there isnt a better way.

End of discussion.
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Old 09-26-2011, 07:10 AM   #19
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Default Re: Any tips for getting chainsaw to start after bad gas?

Seafoam. end of story.
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Old 09-26-2011, 07:50 AM   #20
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Default Re: Any tips for getting chainsaw to start after bad gas?

Skin wrote: "Fact. Liquid fuel does not burn." (sic)

Obviously you're a man of high intellect, and I think it is just terrible how other posters are questioning your superiority! In order to silence these naysayers, I think you are going to have to pour a little liquid gasoline into your cupped palm and try to light it with a match. That will show those dummies who's the smart one!
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