2 stroke compression ?

[ML-TOYS]

I have a chainsaw i am in the process of repairing for someone and need some input. When he dropped it off he said it would try to start a little. 1/2 tank of gas, getting spark, so i tried to start by priming with bulb and different choke settings.
Nothing but a fart from it. I decide to add more fuel thinking maybe hose is short in tank. Surprise surprise theres straight fuel in it, no oil.

What are the chances the cylinder is scored already ? I replaced the fuel and still wont start. With the correct gas will i get an accurate compression reading.

 

[tazmannusa]

Hello
If it was ran at all without oil in the gas odds are it is damaged. Oil in the gas after the fact would make very little difference in a compression reading
Tom

 

[Axx3d]

Add the correct gas/oil mix. If the piston isnt stuck i bet it'll fire up..

Check the comp readings then compare to whatever you can find.

I borrowed a buddy of mine one of my saws.. he ran it for a little bit with out oil then called me and said it wasn't running right. He thought the bar/chain oil he added was for oil injection like a outboard . He added oil and ran it hard all day and that was 5 years ago, I still use that saw...

 

[fowler]

Its only a singke cylender chain saw

Put in the correct mix

If it runs then great
If it doesnt then to bad

any further damage will only be done to already ruined parts

U aint exactly going to bore out a chainsaw

 

[ML-TOYS]

Thanks guys, after trying everything it wont run so to save from having another heart attack i decided to stop pulling that cord and gave in.
Sadly it won the battle but i didnt let it kill me.

 

[Zeus]

Give it a burl with starting fluid (I use "Start ya bastard"). That'll help you check if the carby is clogged up. If it fires then it's just the carby. Fix that and it'll run, even if compression is low it should still fire, I've used an old Stihl saw that was run on 50:1 for all its life (I use 25 on everything save breaking in, which is 20:1).

If you get it running then I suggest using 25:1, since the compression is lower, you'll need more oil for a good seal. I don't know if 2 stroke oils can be found in different weights, but if so I'd use the heaviest available.

 

[Twisted]

If you haven't opened it up yet, I suggest doing so. I once had a chainsaw that someone made the same mistake on and it has been running since. All it took was a new ring and a quick hone and its been running like a champ.

 

[Desertduler]

Remove the muffler and look at the piston through the exhaust port.
If the piston is all scratched up you will know that someone indeed has run the saw with straight gas in the tank.The scratches will start from the crown of the piston and they will continue past the ring lands and into the piston skirt that is how you can tell if the fuel has not been mixed with oil and or not enough oil in the fuel.The piston rings or ring will be stuck in the piston grooves and the rings cannot confirm to the cylinder wall and the result will be lack of compression along with the aluminium from the piston being stuck to the cylinder wall.

 

[ML-TOYS]

Ok i will try those suggestions