[Burntime]

Is your gas cap sealed? Take the screw out of the base of the carb, let some gas (or water) out. Put it back in and set it at either 1 1/2 or 2 turns from seated and go from there. Next you can trace the ignition. I would clean all the contacts to begin with... Good luck!

 

[Burntime]

Or... I had one the mice chewed the plug wire under the shroud. It had intermittant spark. I fixed it with the liquid electrical tape...

 

[Burntime]

Give it a light tap and they usually come off...