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2-stroke engine failures

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KYfarm

07-26-2005 05:35:47

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I have a 2 year old toro trimmer and a 5 year old chainsaw that both ran excellently until both died at the same time. I have changed fuel filters on both, spark plugs on both, drained all gas and gotten rid of gas in tank used to supply my 2-stroke equipement. Made new gas mix and still neither of these pieces will come close to starting. Any ideas?

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07-27-2005 05:07:26

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Re: 2-stroke engine failures in reply to KYfarm, 07-26-2005 05:35:47

Try removing the carburetors and soaking them in brake fluid overnight. Someone on one of the boards suggested this, and I revived 2 old weed eaters that would not run at all using this method. Crazy, but it worked. Never took them apart, I just submerged them and left 'em in 24 hours, then using an air hose blew them out good and fired 'em up. That was a couple years ago, and I know one of them is still running. Guess it soaks all the dried fuel out of them.

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don OH

07-26-2005 15:06:03

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Re: 2-stroke engine failures in reply to KYfarm, 07-26-2005 05:35:47

gas that contains alcohol can attack fuel lines and seals, crank end seals that go bad will not let engine breath right. this is what may have happened if they were both running and then quit.

if they sat awhile check exhuast for mud dubbers
they will find if they can et to them.

if sat for about 3weeks or more in warm weather,
carbs are gummed up.

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Tom R

07-26-2005 09:56:42

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Re: 2-stroke engine failures in reply to KYfarm, 07-26-2005 05:35:47

All the previous replies are accurate. In addition, there are several other relatively common issues with 2 cycle engines.

Over a period of time with non-use, the reed valves may "stick" (probably from dried fuel mixture). This can usually be corrected by pouring a small amount of fuel into the spark plug hole and starting the engine.

The exhaust may be plugged with carbon build-up. This is expecially true if there is a piece of screen wire that acts as a spark arrestor. To fix this, you need to remove the muffler (or whatever else in in the exhaust flow) and scrape off the excess carbon.

I assume that you have checked to make sure that you have a spark, any air intake filter is not clogged, etc.

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Mike M

07-26-2005 09:19:38

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Re: 2-stroke engine failures in reply to KYfarm, 07-26-2005 05:35:47

All I can say is that for ME 2 cycle engines cause more grief than any other. They are so simple but cause so many problems ? Of course some of that is how many hours and $ worth of parts are you willing to put into something that sells for less than $100 new.

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sammy the RED

07-26-2005 13:05:13

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Re: 2-stroke engine failures in reply to Mike M, 07-26-2005 09:19:38

For less than $100 new ? ..... What are you buying ?

My trimmer and chain saw cost alot more than $100.

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buickanddeere

07-26-2005 08:35:41

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Re: 2-stroke engine failures in reply to KYfarm, 07-26-2005 05:35:47

Do they turn over smooth by hand with the spark plug removed? Is there flecks of aluminium on the spark plug electrodes? Any winter gasline antifreeze,ethanol gasoline, E85 fuel, #1 diesel or kerosene in that gasoline jug?

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Rick YYC

07-26-2005 07:18:08

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Re: 2-stroke engine failures in reply to KYfarm, 07-26-2005 05:35:47

I also found needle valve operation to be critical in those diaphragm carbs. Make sure it is opening sufficiently and not gummed up.

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frankiee

07-26-2005 06:07:13

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Re: 2-stroke engine failures in reply to KYfarm, 07-26-2005 05:35:47

Either bad luck with both breaking down at same time or something that is a common link.
Sounds like you suspect something to do with fuel.
Small engines therefore small jets.
I usually wind the jets in making sure to count the turns. Then back jet screws out again to original. Then open jet screws very open. Pull spark plug out so wont start and easy to pull over fast. Pull over many times with gas trigger wide open.
This is all to try to draw dirt or water out of carb.
Reset the jet screws to original positon and put plug back in.
Make sure the plugs are not wet from water.
A new plug makes starting hard to start things much easier. I buy small engine plugs by the half dozzen and am not afraid to use them. (I hate yanking on cords)
Squirt some fuel in the carb (just a bit) and try to start it. If it gets going, rev it and put the machine in some different positions. (This is to move water or dirt away from the fuel pick up if there is any left.
If you can keep it reving then close the choke to a point just before stalling the let the engine speed up again (This is to draw dirt or water out of carb by using the high vacuum of motor when choked)
If still no go then open the Jets again and crank untill it fires or does something.
After all that if it dont run I decide that it will be easier to pull the carb apart and do a major clean.
Small carbs are a bugger.
I was in the "futures" program when I was young and did small engines and my boss said that sometimes he would have to have a carb apart 2 or 3 different times if they had crud in them.
If it was contaminated fuel that you got and the crud got into the carbs then I wish you some luck.

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mud

07-26-2005 05:57:11

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Re: 2-stroke engine failures in reply to KYfarm, 07-26-2005 05:35:47

I have had similar troubles with 2 strokes in the past.

1. make sure that the fuel line has not cracked. believe it or not, some of those lines get brittle when they are in a dry tank. I have replaced lines in a Echo blower, Sachs-Dolmar saw,
and a Tanaka pump.

2. look for trash in the carb.

3. are you sure you got spark?

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Ken Macfarlane

07-26-2005 09:33:40

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Re: 2-stroke engine failures in reply to mud, 07-26-2005 05:57:11

2 stroke mix is good for about 3 week to a month in the summer. After that the mix oil no longer suspends properly.

If a 2 stroke engine is to be stored more than a week in should be run dry so the carb diaphrams don't stick.

If you have alcohol in the fuel where you live you should always buy fresh gas as ethanol has a strong desire to be with water which doesn't lubricate well.

Hope this helps.

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