I pulled out the most easily accessible L head - 2011 on a Masport lawn marshall. Now granted, I left it with a 1/8 of a tank of 98 ron 6 months ago, but I filled with fresh 3 weeks ago and ran 5 minutes unloaded.

Check oil, fired up first pull, warmed up 40 seconds, put throttle to half and started. Got one strip and it started staggering, then surged and died.

Tried again, same problem. Didn't feel line stripping a pulsaprime at 5pm with a lawn still to do, so dragged out the old 1993 Quantum 35. 3 pulls and off it went (3 months sitting)

If I had grabbed the FC commando out, first or second pull and no hassle (except for the thorougher after mow deck cleaning)