051 won't start

[sunriseseamless]

I just picked up an old Stihl 051.  I was intending to use it for parts, but thought I might tinker and see if I could get it running.  The guy i bought it from didn't know the history.
Has good compression, (based on rope pull)
Has spark sometimes, (Tested w/ plug out and resting on frame)
Pulled plug second time and is wet with fuel.
Any suggestions from here?

[oldsaw]

Check the kill switch, especially for an intermittent like that.  Coil is a possibility, but I'd start with the kill switch first.  If it is a points ignition, clean and check the points and condensor.

Mark

[joe_indi]

Pulled plug second time and is wet with fuel.
Any suggestions from here?

This does not seem to be a problem with the spark, more like a problem with the carb.
If the plug comes out wet on the 2nd pull, the carb seems to be flooding.
Probable cause:
Leaking inlet valve (will need replacement)
or
Saw dust between the metering diaphragm and its cover (Clean)

Joe

[taxidermist]

I have had the same problem on a few name brand saws and it was always a weak coil. It would fire the plug fine out of the saw but under comp with fuel it was to weak to fire. Try this take a torch and heat up the plug red hot stick it back in fast and see if it fires. Also like Joe said check the dust in the metering plate.


Rob