Stihl 011 av won't start

[a. palmer jr.]

I'm working on an 011av for a friend and can't get it to start. I took the side cover off to look into the muffler and the piston and cylinder look perfect. The saw has plenty of spark but I can't get the engine to fire even when I squirt a little bit of fuel down into the spark plug hole. It appears to have plenty of compression, over 100 anyway, so I'm thinking this thing should start.

 

[pioneerguy600]

Spark at the correct time comes to mind when I encounter a problem like this.

 

[redunshee]

How much over 100. I'm betting on low compression

 

[a. palmer jr.]

Maybe I can get between 110 and 120 with my well used compression tester. I figured since it's a reed valve engine that might be enough compression. I'll probably tear it down today and check the flywheel key, don't know why I didn't check that the last time I had the cover off...I haven't checked the reed valve yet to see if it's okay.

 

[pioneerguy600]

If you squirted the fuel in the sparkplug hole the engine would fire even if the reed valve was missing, spark at the correct time would fire it off.

 

[a. palmer jr.]

If you squirted the fuel in the sparkplug hole the engine would fire even if the reed valve was missing, spark at the correct time would fire it off.

Correct. I just noticed this is a points saw, checked the flywheel and it was on correctly, key was intact. Points were set at about .013 so that's not far off, I guess. The only thing that might cause spark to be off time might be an open condenser which I didn't check. I did notice a lot of blow by at the carb when I put fuel in it and tried to fire it up. I checked the reed valve anyway and it appeared to be okay..The compression is probably enough to fire so I might look into the condenser, but I may check the compression again just to be sure..